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At least 667 records · Page 37
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Tm3Fe2Si3 by Materials Project

Tm3Fe2Si3 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. there are two inequivalent Tm sites. In the first Tm site, Tm is bonded in a 5-coordinate geometry to four equivalent Fe and five Si atoms. All Tm–Fe bond lengths are 3.15 Å. There are four shorter (2.83 Å) and one longer (3.22 Å) Tm–Si bond lengths. In the second Tm site, Tm is bonded in a 10-coordinate geometry to four equivalent Fe and seven Si atoms. There are a spread of Tm–Fe bond distances ranging from 2.96–3.08 Å. There are a spread of Tm–Si bond distances ranging from 2.91–3.24 Å. Fe is bonded in a 10-coordinate geometry to six Tm and four Si atoms. There are a spread of Fe–Si bond distances ranging from 2.30–2.56 Å. There are two inequivalent Si sites. In the first Si site, Si is bonded in a 9-coordinate geometry to seven Tm and two equivalent Fe atoms. In the second Si site, Si is bonded in a 10-coordinate geometry to six Tm, three equivalent Fe, and one Si atom. The Si–Si bond length is 2.79 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tm2AlGe3 by Materials Project

Tm2AlGe3 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Tm sites. In the first Tm site, Tm is bonded in a 7-coordinate geometry to two equivalent Al and nine Ge atoms. Both Tm–Al bond lengths are 3.29 Å. There are a spread of Tm–Ge bond distances ranging from 2.95–3.31 Å. In the second Tm site, Tm is bonded in a 7-coordinate geometry to seven Ge atoms. There are a spread of Tm–Ge bond distances ranging from 2.91–3.02 Å. Al is bonded to two equivalent Tm and four Ge atoms to form distorted AlTm2Ge4 tetrahedra that share corners with two equivalent GeTm4Al3 pentagonal bipyramids and edges with four equivalent AlTm2Ge4 tetrahedra. There are a spread of Al–Ge bond distances ranging from 2.54–2.69 Å. There are three inequivalent Ge sites. In the first Ge site, Ge is bonded to four Tm and three equivalent Al atoms to form distorted GeTm4Al3 pentagonal bipyramids that share corners with two equivalent AlTm2Ge4 tetrahedra and edges with six equivalent GeTm4Al3 pentagonal bipyramids. In the second Ge site, Ge is bonded in a 4-coordinate geometry to six Tm and two equivalent Ge atoms. There are one shorter (2.56 Å) and one longer (2.67 Å) Ge–Ge bond lengths. In the third Ge site, Ge is bonded in a 9-coordinate geometry to six Tm, one Al, and two equivalent Ge atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tm3Sn by Materials Project

Tm3Sn is Uranium Silicide-like structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. there are two inequivalent Tm sites. In the first Tm site, Tm is bonded to eight Tm and four equivalent Sn atoms to form distorted TmTm8Sn4 cuboctahedra that share corners with twelve equivalent TmTm8Sn4 cuboctahedra, edges with eight equivalent TmTm8Sn4 cuboctahedra, edges with eight equivalent SnTm12 cuboctahedra, faces with four equivalent SnTm12 cuboctahedra, and faces with ten equivalent TmTm8Sn4 cuboctahedra. There are four shorter (3.25 Å) and four longer (3.46 Å) Tm–Tm bond lengths. All Tm–Sn bond lengths are 3.46 Å. In the second Tm site, Tm is bonded in a square co-planar geometry to eight equivalent Tm and four equivalent Sn atoms. All Tm–Sn bond lengths are 3.25 Å. Sn is bonded to twelve Tm atoms to form SnTm12 cuboctahedra that share corners with four equivalent SnTm12 cuboctahedra, edges with eight equivalent SnTm12 cuboctahedra, edges with sixteen equivalent TmTm8Sn4 cuboctahedra, faces with four equivalent SnTm12 cuboctahedra, and faces with eight equivalent TmTm8Sn4 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tm2Ga3Fe14 by Materials Project

Tm2Fe14Ga3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Tm sites. In the first Tm site, Tm is bonded in a 6-coordinate geometry to eighteen Fe atoms. There are a spread of Tm–Fe bond distances ranging from 2.85–3.26 Å. In the second Tm site, Tm is bonded in a 8-coordinate geometry to fourteen Fe and six equivalent Ga atoms. There are a spread of Tm–Fe bond distances ranging from 2.98–3.16 Å. All Tm–Ga bond lengths are 3.21 Å. There are three inequivalent Fe sites. In the first Fe site, Fe is bonded in a 2-coordinate geometry to one Tm, ten Fe, and three equivalent Ga atoms. There are a spread of Fe–Fe bond distances ranging from 2.29–2.90 Å. All Fe–Ga bond lengths are 2.62 Å. In the second Fe site, Fe is bonded in a 12-coordinate geometry to two Tm, seven Fe, and two equivalent Ga atoms. There are three shorter (2.51 Å) and two longer (2.52 Å) Fe–Fe bond lengths. Both Fe–Ga bond lengths are 2.51 Å. In the third Fe site, Fe is bonded to three Tm, seven Fe, and two equivalent Ga atoms to form distorted FeTm3Ga2Fe7 cuboctahedra that share corners with five equivalent GaTm2Fe10 cuboctahedra, corners with ten equivalent FeTm3Ga2Fe7 cuboctahedra, edges with three equivalent GaTm2Fe10 cuboctahedra, edges with five equivalent FeTm3Ga2Fe7 cuboctahedra, faces with two equivalent GaTm2Fe10 cuboctahedra, and faces with eight equivalent FeTm3Ga2Fe7 cuboctahedra. Both Fe–Fe bond lengths are 2.44 Å. Both Fe–Ga bond lengths are 2.47 Å. Ga is bonded to two equivalent Tm and ten Fe atoms to form GaTm2Fe10 cuboctahedra that share corners with four equivalent GaTm2Fe10 cuboctahedra, corners with ten equivalent FeTm3Ga2Fe7 cuboctahedra, edges with six equivalent FeTm3Ga2Fe7 cuboctahedra, faces with four equivalent FeTm3Ga2Fe7 cuboctahedra, and faces with six equivalent GaTm2Fe10 cuboctahedra.

36 MATERIALS SCIENCE↗
NASA NTRS1999

Autonomous Formation Flying from the Ground to Flight

The cost of on-orbit operations remains a significant and increasingly visible concern in the support of satellite missions. Headway has been made in automating some ground operations; however, increased mission complexity and more precise orbital constraints have compelled continuing human involvement in mission design and maneuver planning operations. AI Solutions, Inc. in cooperation with the National Aeronautics and Space Administration's (NASA) Goddard Space Flight Center (GSFC) has tackled these more complex problems through the development of AutoCon(TM) as a tool for an automated solution. NASA is using AutoCon(TM) to automate the maneuver planning for the Earth Orbiter-1 (EO-1) mission. AutoCon(TM) was developed originally as a ground system tool. The EO-1 mission will be using a scaled version of AutoCon(TM) on-board the EO-1 satellite to command orbit adjustment maneuvers. The flight version of AutoCon(TM) plans maneuvers based on formation flying algorithms developed by GSFC, JPL, and other industry partners. In its fully autonomous mode, an AutoCon(TM) planned maneuver will be executed on-board the satellite without intervention from the ground. This paper describes how AutoCon(TM) automates maneuver planning for the formation flying constraints of the EO-1 mission. AutoCon(TM) was modified in a number of ways to automate the maneuver planning on-board the satellite. This paper describes how the interface and functionality of AutoCon(TM) were modified to support the on-board system. A significant component of this modification was the implementation of a data smoother, based on a Kalman filter, that ensures that the spacecraft states estimated by an on-board GPS receiver are as accurate as possible for maneuver planning. This paper also presents the methodology used to scale the AutoCon(TM) functionality to fit and execute on the flight hardware. This paper also presents the modes built into the system that allow the incremental phasing in of autonomy. New technologies for autonomous operations are usually received with significant, and probably appropriate, trepidation. A number of safeguards have been designed in both AutoCon(TM) and the interfacing systems to alleviate the potential of mission-impacting anomalies from the on-board autonomous system. This paper describes the error checking, input data integrity validation, and limits set on maneuvers in AutoCon(TM) and the on-board system.

Chapman, Keith B.↗
DOE OSTI2020

Materials Data on TmNi4B by Materials Project

TmNi4B crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. there are two inequivalent Tm sites. In the first Tm site, Tm is bonded in a 12-coordinate geometry to twelve equivalent Ni and six equivalent B atoms. All Tm–Ni bond lengths are 2.86 Å. All Tm–B bond lengths are 2.85 Å. In the second Tm site, Tm is bonded in a distorted hexagonal planar geometry to six equivalent Ni atoms. All Tm–Ni bond lengths are 2.85 Å. There are two inequivalent Ni sites. In the first Ni site, Ni is bonded in a distorted L-shaped geometry to two equivalent Tm, two equivalent Ni, and two equivalent B atoms. Both Ni–Ni bond lengths are 2.47 Å. Both Ni–B bond lengths are 2.03 Å. In the second Ni site, Ni is bonded in a 12-coordinate geometry to three equivalent Tm and nine Ni atoms. All Ni–Ni bond lengths are 2.85 Å. B is bonded in a 6-coordinate geometry to three equivalent Tm and six equivalent Ni atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tm6FeSb2 by Materials Project

Tm6FeSb2 crystallizes in the hexagonal P-62m space group. The structure is three-dimensional. there are two inequivalent Tm sites. In the first Tm site, Tm is bonded in a 4-coordinate geometry to two equivalent Fe and two equivalent Sb atoms. Both Tm–Fe bond lengths are 2.79 Å. Both Tm–Sb bond lengths are 3.18 Å. In the second Tm site, Tm is bonded in a 5-coordinate geometry to one Fe and four equivalent Sb atoms. The Tm–Fe bond length is 3.19 Å. All Tm–Sb bond lengths are 3.22 Å. Fe is bonded in a 9-coordinate geometry to nine Tm atoms. Sb is bonded in a 9-coordinate geometry to nine Tm atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tm2Ni17 by Materials Project

Tm2Ni17 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Tm sites. In the first Tm site, Tm is bonded in a 12-coordinate geometry to eighteen Ni atoms. There are a spread of Tm–Ni bond distances ranging from 2.89–3.21 Å. In the second Tm site, Tm is bonded in a 2-coordinate geometry to twenty Ni atoms. There are a spread of Tm–Ni bond distances ranging from 2.80–3.10 Å. There are four inequivalent Ni sites. In the first Ni site, Ni is bonded in a 2-coordinate geometry to one Tm and thirteen Ni atoms. There are a spread of Ni–Ni bond distances ranging from 2.38–2.70 Å. In the second Ni site, Ni is bonded to two equivalent Tm and ten Ni atoms to form NiTm2Ni10 cuboctahedra that share corners with fourteen NiTm2Ni10 cuboctahedra, edges with six equivalent NiTm3Ni9 cuboctahedra, and faces with ten NiTm2Ni10 cuboctahedra. There are four shorter (2.37 Å) and four longer (2.39 Å) Ni–Ni bond lengths. In the third Ni site, Ni is bonded in a 12-coordinate geometry to two Tm and ten Ni atoms. There are a spread of Ni–Ni bond distances ranging from 2.35–2.50 Å. In the fourth Ni site, Ni is bonded to three Tm and nine Ni atoms to form a mixture of distorted corner, edge, and face-sharing NiTm3Ni9 cuboctahedra. Both Ni–Ni bond lengths are 2.38 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tm5(SiSb)2 by Materials Project

Tm5Sb2Si2 crystallizes in the orthorhombic Cmce space group. The structure is three-dimensional. there are two inequivalent Tm sites. In the first Tm site, Tm is bonded to three equivalent Si and three equivalent Sb atoms to form distorted TmSi3Sb3 pentagonal pyramids that share corners with three equivalent TmSi4Sb2 octahedra, corners with ten equivalent TmSi3Sb3 pentagonal pyramids, edges with seven equivalent TmSi3Sb3 pentagonal pyramids, faces with two equivalent TmSi4Sb2 octahedra, and faces with two equivalent TmSi3Sb3 pentagonal pyramids. The corner-sharing octahedra tilt angles range from 36–41°. There are one shorter (2.89 Å) and two longer (2.98 Å) Tm–Si bond lengths. There are one shorter (3.11 Å) and two longer (3.14 Å) Tm–Sb bond lengths. In the second Tm site, Tm is bonded to four equivalent Si and two equivalent Sb atoms to form TmSi4Sb2 octahedra that share corners with four equivalent TmSi4Sb2 octahedra, corners with twelve equivalent TmSi3Sb3 pentagonal pyramids, and faces with eight equivalent TmSi3Sb3 pentagonal pyramids. The corner-sharing octahedral tilt angles are 50°. There are two shorter (3.02 Å) and two longer (3.03 Å) Tm–Si bond lengths. Both Tm–Sb bond lengths are 3.07 Å. Si is bonded in a 8-coordinate geometry to eight Tm atoms. Sb is bonded to seven Tm atoms to form a mixture of distorted edge and corner-sharing SbTm7 pentagonal bipyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tm3Sb by Materials Project

Tm3Sb crystallizes in the tetragonal P4_2/n space group. The structure is three-dimensional. there are three inequivalent Tm sites. In the first Tm site, Tm is bonded in a 3-coordinate geometry to three equivalent Sb atoms. There are a spread of Tm–Sb bond distances ranging from 3.09–3.21 Å. In the second Tm site, Tm is bonded in a distorted see-saw-like geometry to four equivalent Sb atoms. There are a spread of Tm–Sb bond distances ranging from 3.11–3.15 Å. In the third Tm site, Tm is bonded in a distorted bent 150 degrees geometry to two equivalent Sb atoms. There are one shorter (3.15 Å) and one longer (3.21 Å) Tm–Sb bond lengths. Sb is bonded in a 9-coordinate geometry to nine Tm atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tm2Fe17 by Materials Project

Tm2Fe17 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Tm sites. In the first Tm site, Tm is bonded in a 6-coordinate geometry to eighteen Fe atoms. There are a spread of Tm–Fe bond distances ranging from 2.93–3.25 Å. In the second Tm site, Tm is bonded in a 8-coordinate geometry to twenty Fe atoms. There are a spread of Tm–Fe bond distances ranging from 2.95–3.19 Å. There are four inequivalent Fe sites. In the first Fe site, Fe is bonded in a 2-coordinate geometry to one Tm and thirteen Fe atoms. There are a spread of Fe–Fe bond distances ranging from 2.36–2.78 Å. In the second Fe site, Fe is bonded to two equivalent Tm and ten Fe atoms to form FeTm2Fe10 cuboctahedra that share corners with fourteen FeTm2Fe10 cuboctahedra, edges with six equivalent FeTm3Fe9 cuboctahedra, and faces with ten FeTm2Fe10 cuboctahedra. There are four shorter (2.44 Å) and four longer (2.45 Å) Fe–Fe bond lengths. In the third Fe site, Fe is bonded in a 12-coordinate geometry to two Tm and ten Fe atoms. There are a spread of Fe–Fe bond distances ranging from 2.47–2.57 Å. In the fourth Fe site, Fe is bonded to three Tm and nine Fe atoms to form a mixture of distorted edge, face, and corner-sharing FeTm3Fe9 cuboctahedra. Both Fe–Fe bond lengths are 2.42 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tm3Ga5 by Materials Project

Tm3Ga5 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Tm sites. In the first Tm site, Tm is bonded in a 9-coordinate geometry to nine Ga atoms. There are a spread of Tm–Ga bond distances ranging from 2.82–3.26 Å. In the second Tm site, Tm is bonded in a 10-coordinate geometry to ten Ga atoms. There are a spread of Tm–Ga bond distances ranging from 2.94–3.30 Å. There are four inequivalent Ga sites. In the first Ga site, Ga is bonded in a 10-coordinate geometry to six Tm and four Ga atoms. There are a spread of Ga–Ga bond distances ranging from 2.66–2.88 Å. In the second Ga site, Ga is bonded in a 1-coordinate geometry to five Tm and five Ga atoms. There are a spread of Ga–Ga bond distances ranging from 2.67–3.01 Å. In the third Ga site, Ga is bonded in a 10-coordinate geometry to six Tm and four Ga atoms. In the fourth Ga site, Ga is bonded in a 9-coordinate geometry to six Tm and three Ga atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tm3(GePd)4 by Materials Project

Tm3(PdGe)4 crystallizes in the orthorhombic Immm space group. The structure is three-dimensional. there are two inequivalent Tm sites. In the first Tm site, Tm is bonded in a 12-coordinate geometry to six equivalent Pd and six Ge atoms. There are four shorter (3.04 Å) and two longer (3.12 Å) Tm–Pd bond lengths. There are two shorter (3.00 Å) and four longer (3.02 Å) Tm–Ge bond lengths. In the second Tm site, Tm is bonded to six Ge atoms to form distorted edge-sharing TmGe6 octahedra. All Tm–Ge bond lengths are 3.03 Å. Pd is bonded in a 12-coordinate geometry to three equivalent Tm and four Ge atoms. There are one shorter (2.55 Å) and three longer (2.59 Å) Pd–Ge bond lengths. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 9-coordinate geometry to six Tm, two equivalent Pd, and one Ge atom. The Ge–Ge bond length is 2.67 Å. In the second Ge site, Ge is bonded in a 9-coordinate geometry to three Tm and six equivalent Pd atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on YbTm3 by Materials Project

YbTm3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Yb is bonded to twelve Tm atoms to form YbTm12 cuboctahedra that share corners with four equivalent YbTm12 cuboctahedra, corners with eight equivalent TmYb4Tm8 cuboctahedra, edges with eight equivalent YbTm12 cuboctahedra, edges with sixteen equivalent TmYb4Tm8 cuboctahedra, faces with four equivalent YbTm12 cuboctahedra, and faces with fourteen TmYb4Tm8 cuboctahedra. There are four shorter (3.53 Å) and eight longer (3.55 Å) Yb–Tm bond lengths. There are two inequivalent Tm sites. In the first Tm site, Tm is bonded to four equivalent Yb and eight Tm atoms to form TmYb4Tm8 cuboctahedra that share corners with twelve equivalent TmYb4Tm8 cuboctahedra, edges with eight equivalent YbTm12 cuboctahedra, edges with sixteen TmYb4Tm8 cuboctahedra, faces with four equivalent YbTm12 cuboctahedra, and faces with fourteen TmYb4Tm8 cuboctahedra. There are four shorter (3.53 Å) and four longer (3.55 Å) Tm–Tm bond lengths. In the second Tm site, Tm is bonded to four equivalent Yb and eight equivalent Tm atoms to form TmYb4Tm8 cuboctahedra that share corners with four equivalent TmYb4Tm8 cuboctahedra, corners with eight equivalent YbTm12 cuboctahedra, edges with twenty-four TmYb4Tm8 cuboctahedra, faces with six equivalent YbTm12 cuboctahedra, and faces with twelve TmYb4Tm8 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tm3(CuGe)4 by Materials Project

Tm3(CuGe)4 crystallizes in the orthorhombic Immm space group. The structure is three-dimensional. there are two inequivalent Tm sites. In the first Tm site, Tm is bonded in a 12-coordinate geometry to six equivalent Cu and six Ge atoms. There are four shorter (2.97 Å) and two longer (3.04 Å) Tm–Cu bond lengths. There are two shorter (2.97 Å) and four longer (3.02 Å) Tm–Ge bond lengths. In the second Tm site, Tm is bonded to six Ge atoms to form distorted edge-sharing TmGe6 octahedra. There are four shorter (2.91 Å) and two longer (2.98 Å) Tm–Ge bond lengths. Cu is bonded in a 12-coordinate geometry to three equivalent Tm, one Cu, and four Ge atoms. The Cu–Cu bond length is 2.53 Å. There are a spread of Cu–Ge bond distances ranging from 2.46–2.57 Å. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 9-coordinate geometry to three Tm and six equivalent Cu atoms. In the second Ge site, Ge is bonded in a 9-coordinate geometry to six Tm, two equivalent Cu, and one Ge atom. The Ge–Ge bond length is 2.55 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tm6CoBi2 by Materials Project

Tm6CoBi2 crystallizes in the hexagonal P-62m space group. The structure is three-dimensional. there are two inequivalent Tm sites. In the first Tm site, Tm is bonded in a 5-coordinate geometry to one Co and four equivalent Bi atoms. The Tm–Co bond length is 3.22 Å. All Tm–Bi bond lengths are 3.26 Å. In the second Tm site, Tm is bonded in a 4-coordinate geometry to two equivalent Co and two equivalent Bi atoms. Both Tm–Co bond lengths are 2.78 Å. Both Tm–Bi bond lengths are 3.26 Å. Co is bonded in a 9-coordinate geometry to nine Tm atoms. Bi is bonded in a 9-coordinate geometry to nine Tm atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tm4Mn4Sn7 by Materials Project

Tm4Mn4Sn7 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. there are two inequivalent Tm sites. In the first Tm site, Tm is bonded to seven Sn atoms to form a mixture of distorted edge, corner, and face-sharing TmSn7 pentagonal bipyramids. There are a spread of Tm–Sn bond distances ranging from 3.05–3.24 Å. In the second Tm site, Tm is bonded in a 7-coordinate geometry to seven Sn atoms. There are a spread of Tm–Sn bond distances ranging from 3.04–3.33 Å. Mn is bonded in a 6-coordinate geometry to six Sn atoms. There are a spread of Mn–Sn bond distances ranging from 2.75–2.83 Å. There are four inequivalent Sn sites. In the first Sn site, Sn is bonded in a 9-coordinate geometry to five Tm and four equivalent Mn atoms. In the second Sn site, Sn is bonded in a 8-coordinate geometry to four Tm and four equivalent Mn atoms. In the third Sn site, Sn is bonded in a 10-coordinate geometry to eight Tm and two equivalent Sn atoms. There are one shorter (2.90 Å) and one longer (2.91 Å) Sn–Sn bond lengths. In the fourth Sn site, Sn is bonded in a 5-coordinate geometry to one Tm, four equivalent Mn, and one Sn atom. The Sn–Sn bond length is 2.90 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sr3Tm3Al4Si8N17O4 by Materials Project

Sr3Tm3Al4Si8N17O4 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are six inequivalent Sr2+ sites. In the first Sr2+ site, Sr2+ is bonded in a 6-coordinate geometry to three N3- and three O2- atoms. There are a spread of Sr–N bond distances ranging from 2.51–2.75 Å. There are a spread of Sr–O bond distances ranging from 2.43–2.55 Å. In the second Sr2+ site, Sr2+ is bonded in a 6-coordinate geometry to four N3- and two O2- atoms. There are a spread of Sr–N bond distances ranging from 2.34–2.75 Å. There are one shorter (2.45 Å) and one longer (2.88 Å) Sr–O bond lengths. In the third Sr2+ site, Sr2+ is bonded in a 6-coordinate geometry to three N3- and three O2- atoms. There are a spread of Sr–N bond distances ranging from 2.49–2.79 Å. There are one shorter (2.45 Å) and two longer (2.55 Å) Sr–O bond lengths. In the fourth Sr2+ site, Sr2+ is bonded in a 5-coordinate geometry to five N3- atoms. There are a spread of Sr–N bond distances ranging from 2.51–2.63 Å. In the fifth Sr2+ site, Sr2+ is bonded in a 6-coordinate geometry to six N3- atoms. There are a spread of Sr–N bond distances ranging from 2.48–2.84 Å. In the sixth Sr2+ site, Sr2+ is bonded in a 7-coordinate geometry to seven N3- atoms. There are a spread of Sr–N bond distances ranging from 2.37–3.03 Å. There are six inequivalent Tm3+ sites. In the first Tm3+ site, Tm3+ is bonded to six N3- atoms to form distorted TmN6 pentagonal pyramids that share corners with four SiN4 tetrahedra and edges with two SiN4 tetrahedra. There are a spread of Tm–N bond distances ranging from 2.34–2.53 Å. In the second Tm3+ site, Tm3+ is bonded to four N3- and two O2- atoms to form distorted TmN4O2 pentagonal pyramids that share a cornercorner with one AlN3O tetrahedra, corners with four SiN3O tetrahedra, an edgeedge with one SiN4 tetrahedra, and an edgeedge with one AlN3O trigonal pyramid. There are a spread of Tm–N bond distances ranging from 2.29–2.42 Å. There are one shorter (2.27 Å) and one longer (2.47 Å) Tm–O bond lengths. In the third Tm3+ site, Tm3+ is bonded in a 6-coordinate geometry to five N3- and one O2- atom. There are a spread of Tm–N bond distances ranging from 2.25–2.93 Å. The Tm–O bond length is 2.32 Å. In the fourth Tm3+ site, Tm3+ is bonded in a 7-coordinate geometry to five N3- and two O2- atoms. There are a spread of Tm–N bond distances ranging from 2.38–2.81 Å. There are one shorter (2.47 Å) and one longer (2.75 Å) Tm–O bond lengths. In the fifth Tm3+ site, Tm3+ is bonded in a 6-coordinate geometry to four N3- and two O2- atoms. There are a spread of Tm–N bond distances ranging from 2.28–2.46 Å. There are one shorter (2.35 Å) and one longer (2.56 Å) Tm–O bond lengths. In the sixth Tm3+ site, Tm3+ is bonded in a 6-coordinate geometry to five N3- and one O2- atom. There are a spread of Tm–N bond distances ranging from 2.31–2.49 Å. The Tm–O bond length is 2.63 Å. There are eight inequivalent Al3+ sites. In the first Al3+ site, Al3+ is bonded in a 3-coordinate geometry to two N3- and one O2- atom. There is one shorter (1.82 Å) and one longer (1.88 Å) Al–N bond length. The Al–O bond length is 1.93 Å. In the second Al3+ site, Al3+ is bonded to three N3- and one O2- atom to form AlN3O tetrahedra that share a cornercorner with one TmN4O2 pentagonal pyramid and corners with three SiN4 tetrahedra. There is one shorter (1.85 Å) and two longer (1.89 Å) Al–N bond length. The Al–O bond length is 1.83 Å. In the third Al3+ site, Al3+ is bonded in a distorted trigonal non-coplanar geometry to two N3- and one O2- atom. Both Al–N bond lengths are 1.84 Å. The Al–O bond length is 1.89 Å. In the fourth Al3+ site, Al3+ is bonded to three N3- and one O2- atom to form AlN3O trigonal pyramids that share corners with three SiN3O tetrahedra and an edgeedge with one TmN4O2 pentagonal pyramid. There are a spread of Al–N bond distances ranging from 1.81–2.02 Å. The Al–O bond length is 1.78 Å. In the fifth Al3+ site, Al3+ is bonded in a T-shaped geometry to two N3- and one O2- atom. There is one shorter (1.86 Å) and one longer (1.87 Å) Al–N bond length. The Al–O bond length is 1.89 Å. In the sixth Al3+ site, Al3+ is bonded in a T-shaped geometry to one N3- and two O2- atoms. The Al–N bond length is 1.82 Å. Both Al–O bond lengths are 1.80 Å. In the seventh Al3+ site, Al3+ is bonded in a distorted see-saw-like geometry to two N3- and two O2- atoms. There are one shorter (1.87 Å) and one longer (2.18 Å) Al–N bond lengths. There is one shorter (1.87 Å) and one longer (2.00 Å) Al–O bond length. In the eighth Al3+ site, Al3+ is bonded in a distorted trigonal non-coplanar geometry to three N3- and one O2- atom. There are a spread of Al–N bond distances ranging from 1.83–2.60 Å. The Al–O bond length is 1.81 Å. There are sixteen inequivalent Si4+ sites. In the first Si4+ site, Si4+ is bonded to four N3- atoms to form corner-sharing SiN4 tetrahedra. There are a spread of Si–N bond distances ranging from 1.69–1.81 Å. In the second Si4+ site, Si4+ is bonded in a trigonal non-coplanar geometry to two N3- and one O2- atom. There is one shorter (1.70 Å) and one longer (1.73 Å) Si–N bond length. The Si–O bond length is 1.77 Å. In the third Si4+ site, Si4+ is bonded to three N3- and one O2- atom to form corner-sharing SiN3O tetrahedra. There is two shorter (1.75 Å) and one longer (1.82 Å) Si–N bond length. The Si–O bond length is 1.70 Å. In the fourth Si4+ site, Si4+ is bonded to four N3- atoms to form SiN4 tetrahedra that share a cornercorner with one TmN4O2 pentagonal pyramid, a cornercorner with one SiN4 tetrahedra, and corners with two equivalent AlN3O tetrahedra. There are a spread of Si–N bond distances ranging from 1.72–1.87 Å. In the fifth Si4+ site, Si4+ is bonded to four N3- atoms to form SiN4 tetrahedra that share a cornercorner with one TmN6 pentagonal pyramid and corners with three SiN4 tetrahedra. There are a spread of Si–N bond distances ranging from 1.74–1.88 Å. In the sixth Si4+ site, Si4+ is bonded to four N3- atoms to form SiN4 tetrahedra that share a cornercorner with one TmN4O2 pentagonal pyramid, a cornercorner with one AlN3O tetrahedra, corners with two SiN3O tetrahedra, a cornercorner with one AlN3O trigonal pyramid, and an edgeedge with one TmN4O2 pentagonal pyramid. There are a spread of Si–N bond distances ranging from 1.71–1.82 Å. In the seventh Si4+ site, Si4+ is bonded to four N3- atoms to form corner-sharing SiN4 tetrahedra. There are a spread of Si–N bond distances ranging from 1.77–1.81 Å. In the eighth Si4+ site, Si4+ is bonded to four N3- atoms to form SiN4 tetrahedra that share a cornercorner with one TmN6 pentagonal pyramid, corners with three SiN4 tetrahedra, and an edgeedge with one TmN6 pentagonal pyramid. There are a spread of Si–N bond distances ranging from 1.73–1.80 Å. In the ninth Si4+ site, Si4+ is bonded in a trigonal non-coplanar geometry to three N3- atoms. There are a spread of Si–N bond distances ranging from 1.66–1.70 Å. In the tenth Si4+ site, Si4+ is bonded to four N3- atoms to form SiN4 tetrahedra that share a cornercorner with one TmN6 pentagonal pyramid and corners with three SiN4 tetrahedra. There are a spread of Si–N bond distances ranging from 1.75–1.99 Å. In the eleventh Si4+ site, Si4+ is bonded in a trigonal planar geometry to three N3- atoms. There are a spread of Si–N bond distances ranging from 1.65–1.69 Å. In the twelfth Si4+ site, Si4+ is bonded to three N3- and one O2- atom to form corner-sharing SiN3O tetrahedra. There are a spread of Si–N bond distances ranging from 1.70–1.88 Å. The Si–O bond length is 1.77 Å. In the thirteenth Si4+ site, Si4+ is bonded to three N3- and one O2- atom to form SiN3O tetrahedra that share corners with two equivalent TmN4O2 pentagonal pyramids, a cornercorner with one SiN4 tetrahedra, and corners with two equivalent AlN3O trigonal pyramids. There are a spread of Si–N bond distances ranging from 1.69–1.92 Å. The Si–O bond length is 1.69 Å. In the fourteenth Si4+ site, Si4+ is bonded to four N3- atoms to form distorted SiN4 tetrahedra that share a cornercorner with one TmN6 pentagonal pyramid, a cornercorner with one SiN4 tetrahedra, and an edgeedge with one TmN6 pentagonal pyramid. There is three shorter (1.70 Å) and one longer (1.80 Å) Si–N bond length. In the fifteenth Si4+ site, Si4+ is bonded in a 4-coordinate geometry to three N3- and one O2- atom. There are a spread of Si–N bond distances ranging from 1.72–2.09 Å. The Si–O bond length is 1.75 Å. In the sixteenth Si4+ site, Si4+ is bonded in a trigonal non-coplanar geometry to three N3- atoms. There are a spread of Si–N bond distances ranging from 1.71–1.83 Å. There are thirty-four inequivalent N3- sites. In the first N3- site, N3- is bonded in a 3-coordinate geometry to one Tm3+, one Al3+, one Si4+, and one N3- atom. The N–N bond length is 1.67 Å. In the second N3- site, N3- is bonded to one Sr2+, one Tm3+, and two Si4+ atoms to form distorted corner-sharing NSrTmSi2 tetrahedra. In the third N3- site, N3- is bonded in a 4-coordinate geometry to one Sr2+, one Tm3+, one Si4+, and one N3- atom. In the fourth N3- site, N3- is bonded in a distorted trigonal planar geometry to one Sr2+ and three Si4+ atoms. In the fifth N3- site, N3- is bonded in a distorted bent 120 degrees geometry to one Sr2+, two Si4+, and one N3- atom. The N–N bond length is 1.59 Å. In the sixth N3- site, N3- is bonded in a 2-coordinate geometry to one Tm3+, two Si4+, and one N3- atom. In the seventh N3- site, N3- is bonded in a trigonal planar geometry to one Al3+ and two Si4+ atoms. In the eighth N3- site, N3- is bonded to one Sr2+, one Tm3+, and two Si4+ atoms to form distorted NSrTmSi2 trigonal pyramids that share a cornercorner with one NAlSi2O tetrahedra and an edgeedge with one NSrTmAlSi trigonal pyramid. In the ninth N3- site, N3- is bonded to one Al3+, two Si4+, and one O2- atom to form corner-sharing NAlSi2O tetrahedra. The N–O bond length is 1.51 Å. In the tenth N3- site, N3- is bonded to one Sr2+, one Tm3+, and two Si4+ atoms to form distorted corner-sharing NSrTmSi2 trigonal pyramids. In the eleventh N3- site, N3- is bonded in a 4-coordinate geometry to one Sr2+, one Tm3+, and two Si4+ atoms. In the twelfth N3- site, N3- is bonded in a 2-coordinate geometry to one Sr2+, one Tm3+, and two Si4+ atoms. In the thirteenth N3- site, N3- is bonded in a 2-coordinate geometry to one Sr2+, one Tm3+, one Al3+, and one Si4+ atom. In the fourteenth N3- site, N3- is bonded in a 5-coordinate geometry to one Sr2+, one Tm3+, two Al3+, and one Si4+ atom. In the fifteenth N3- site, N3- is bonded in a 4-coordinate geometry to one Sr2+, two Tm3+, one Al3+, and one Si4+ atom. In the sixteenth N3- site, N3- is bonded in a 4-coordinate geometry to one Sr2+, one Tm3+, and two Si4+ atoms. In the seventeenth N3- site, N3- is bonded to one Sr2+, one Tm3+, and two Si4+ atoms to form distorted corner-sharing NSrTmSi2 tetrahedra. In the eighteenth N3- site, N3- is bonded in a 2-coordinate geometry to one Sr2+, one Tm3+, and two Si4+ atoms. In the nineteenth N3- site, N3- is bonded in a distorted bent 120 degrees geometry to one Sr2+ and two Si4+ atoms. In the twentieth N3- site, N3- is bonded in a 4-coordinate geometry to one Sr2+, one Tm3+, and two Si4+ atoms. In the twenty-first N3- site, N3- is bonded in a 4-coordinate geometry to one Sr2+, one Tm3+, and two Si4+ atoms. In the twenty-second N3- site, N3- is bonded in a 5-coordinate geometry to one Sr2+, one Tm3+, two Al3+, and one Si4+ atom. In the twenty-third N3- site, N3- is bonded in a distorted trigonal planar geometry to three Si4+ atoms. In the twenty-fourth N3- site, N3- is bonded to one Sr2+, one Tm3+, one Al3+, and one Si4+ atom to form distorted NSrTmAlSi trigonal pyramids that share a cornercorner with one NSrTmSi2 tetrahedra and an edgeedge with one OSrTmAl2 trigonal pyramid. In the twenty-fifth N3- site, N3- is bonded in a 4-coordinate geometry to one Sr2+, one Tm3+, one Al3+, and one Si4+ atom. In the twenty-sixth N3- site, N3- is

36 MATERIALS SCIENCE↗