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At least 1,441 records · Page 80
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Space Qualification Studies of AOTF Devices Under the MISSE-11 Mission

The acousto-optic tunable filter (AOTF) devices are used in a variety of applications including hyperspectral and spectrapolarimetric based imaging. The AOTF devices provide several advantages including speed and random access to desired spectral bands and enable all-solid-state operation that are attractive for space applications. In this paper, the performance of Tellurium Dioxide (TeO 2 ) and Mercurous Bromide (Hg 2 Br 2 ) AOTF devices in space environment carried out under the NASA’s Materials International Space Station Experiments 11 (MISSE-11) mission is discussed. The purpose of the MISSE-11 mission was to study materials and devices subjected to space conditions for long term while attached to the International Space station (ISS). The TeO 2 AOTF was developed for short wavelength IR (SWIR) operation while the Hg 2 Br 2 AOTF device was developed for long wavelength IR (LWIR) operation. These devices were attached to the ISS platform for more than a year. Pre-flight and post-flight performance characterization were performed on these devices. In the case of TeO 2 AOTF, the preflight efficiency was around 87% with a center frequency at 68MHz while the post-flight efficiency was around 83%. However, the optical transmission of Hg 2 Br 2 AOTF had deteriorated considerably. The details of performance testing and analysis of both AOTF devices are discussed.

Space Qualification↗
DOE OSTI2020

Materials Data on KInBr4 by Materials Project

KInBr4 is Zircon-like structured and crystallizes in the orthorhombic Pnna space group. The structure is three-dimensional. K1+ is bonded in a 8-coordinate geometry to eight Br1- atoms. There are a spread of K–Br bond distances ranging from 3.50–3.60 Å. In3+ is bonded in a tetrahedral geometry to four Br1- atoms. There are two shorter (2.55 Å) and two longer (2.56 Å) In–Br bond lengths. There are two inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a 1-coordinate geometry to two equivalent K1+ and one In3+ atom. In the second Br1- site, Br1- is bonded in a 3-coordinate geometry to two equivalent K1+ and one In3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CsTiBr3 by Materials Project

CsTiBr3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Cs1+ is bonded to twelve equivalent Br1- atoms to form CsBr12 cuboctahedra that share corners with six equivalent CsBr12 cuboctahedra, corners with six equivalent TiBr6 octahedra, faces with eight equivalent CsBr12 cuboctahedra, and faces with six equivalent TiBr6 octahedra. The corner-sharing octahedral tilt angles are 17°. There are six shorter (3.92 Å) and six longer (3.97 Å) Cs–Br bond lengths. Ti2+ is bonded to six equivalent Br1- atoms to form TiBr6 octahedra that share corners with six equivalent CsBr12 cuboctahedra, faces with six equivalent CsBr12 cuboctahedra, and faces with two equivalent TiBr6 octahedra. All Ti–Br bond lengths are 2.70 Å. Br1- is bonded in a 6-coordinate geometry to four equivalent Cs1+ and two equivalent Ti2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K2TeBr6 by Materials Project

K2TeBr6 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. K1+ is bonded in a 8-coordinate geometry to eight Br1- atoms. There are a spread of K–Br bond distances ranging from 3.40–3.72 Å. Te4+ is bonded in an octahedral geometry to six Br1- atoms. There are two shorter (2.74 Å) and four longer (2.75 Å) Te–Br bond lengths. There are three inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a distorted trigonal non-coplanar geometry to two equivalent K1+ and one Te4+ atom. In the second Br1- site, Br1- is bonded in a 4-coordinate geometry to three equivalent K1+ and one Te4+ atom. In the third Br1- site, Br1- is bonded in a 4-coordinate geometry to three equivalent K1+ and one Te4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Li2FeBr4 by Materials Project

Li2FeBr4 crystallizes in the orthorhombic Cmmm space group. The structure is three-dimensional. Li1+ is bonded to six Br1- atoms to form LiBr6 octahedra that share corners with six equivalent LiBr6 octahedra, edges with four equivalent LiBr6 octahedra, and edges with four equivalent FeBr6 octahedra. The corner-sharing octahedral tilt angles are 5°. There are four shorter (2.74 Å) and two longer (2.75 Å) Li–Br bond lengths. Fe2+ is bonded to six Br1- atoms to form FeBr6 octahedra that share edges with two equivalent FeBr6 octahedra and edges with eight equivalent LiBr6 octahedra. There are two shorter (2.64 Å) and four longer (2.65 Å) Fe–Br bond lengths. There are two inequivalent Br1- sites. In the first Br1- site, Br1- is bonded to four equivalent Li1+ and one Fe2+ atom to form a mixture of edge and corner-sharing BrLi4Fe square pyramids. In the second Br1- site, Br1- is bonded in a rectangular see-saw-like geometry to two equivalent Li1+ and two equivalent Fe2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PbBrF by Materials Project

PbFBr is Matlockite structured and crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Pb2+ is bonded in a 4-coordinate geometry to five equivalent Br1- and four equivalent F1- atoms. There are four shorter (3.23 Å) and one longer (3.53 Å) Pb–Br bond lengths. All Pb–F bond lengths are 2.59 Å. Br1- is bonded in a 9-coordinate geometry to five equivalent Pb2+ and four equivalent F1- atoms. All Br–F bond lengths are 3.46 Å. F1- is bonded to four equivalent Pb2+ and four equivalent Br1- atoms to form a mixture of edge and face-sharing FPb4Br4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CsCu2Br3 by Materials Project

CsCu2Br3 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Cs1+ is bonded in a 8-coordinate geometry to eight Br1- atoms. There are a spread of Cs–Br bond distances ranging from 3.65–3.89 Å. Cu1+ is bonded to four Br1- atoms to form a mixture of edge and corner-sharing CuBr4 tetrahedra. There are two shorter (2.45 Å) and two longer (2.56 Å) Cu–Br bond lengths. There are two inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a 6-coordinate geometry to two equivalent Cs1+ and four equivalent Cu1+ atoms. In the second Br1- site, Br1- is bonded in a 5-coordinate geometry to three equivalent Cs1+ and two equivalent Cu1+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K2ReBr6 by Materials Project

K2ReBr6 crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. K1+ is bonded to twelve equivalent Br1- atoms to form KBr12 cuboctahedra that share corners with twelve equivalent KBr12 cuboctahedra, faces with six equivalent KBr12 cuboctahedra, and faces with four equivalent ReBr6 octahedra. All K–Br bond lengths are 3.78 Å. Re4+ is bonded to six equivalent Br1- atoms to form ReBr6 octahedra that share faces with eight equivalent KBr12 cuboctahedra. All Re–Br bond lengths are 2.54 Å. Br1- is bonded in a distorted single-bond geometry to four equivalent K1+ and one Re4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SrBrF by Materials Project

SrFBr is Matlockite structured and crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Sr2+ is bonded in a 9-coordinate geometry to five equivalent Br1- and four equivalent F1- atoms. There are four shorter (3.26 Å) and one longer (3.47 Å) Sr–Br bond lengths. All Sr–F bond lengths are 2.54 Å. Br1- is bonded in a 5-coordinate geometry to five equivalent Sr2+ and four equivalent F1- atoms. All Br–F bond lengths are 3.40 Å. F1- is bonded to four equivalent Sr2+ and four equivalent Br1- atoms to form a mixture of face and edge-sharing FSr4Br4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CsVBr3 by Materials Project

CsVBr3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Cs1+ is bonded to twelve equivalent Br1- atoms to form CsBr12 cuboctahedra that share corners with six equivalent CsBr12 cuboctahedra, corners with six equivalent VBr6 octahedra, faces with eight equivalent CsBr12 cuboctahedra, and faces with six equivalent VBr6 octahedra. The corner-sharing octahedral tilt angles are 16°. There are six shorter (3.87 Å) and six longer (4.06 Å) Cs–Br bond lengths. V2+ is bonded to six equivalent Br1- atoms to form VBr6 octahedra that share corners with six equivalent CsBr12 cuboctahedra, faces with six equivalent CsBr12 cuboctahedra, and faces with two equivalent VBr6 octahedra. All V–Br bond lengths are 2.65 Å. Br1- is bonded in a 6-coordinate geometry to four equivalent Cs1+ and two equivalent V2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on RbPb2Br5 by Materials Project

RbPb2Br5 crystallizes in the tetragonal I4/mcm space group. The structure is three-dimensional. Rb1+ is bonded in a 10-coordinate geometry to ten Br1- atoms. There are eight shorter (3.73 Å) and two longer (3.84 Å) Rb–Br bond lengths. Pb2+ is bonded in a 8-coordinate geometry to eight Br1- atoms. There are a spread of Pb–Br bond distances ranging from 2.93–3.41 Å. There are two inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a 5-coordinate geometry to two equivalent Rb1+ and three equivalent Pb2+ atoms. In the second Br1- site, Br1- is bonded to two equivalent Rb1+ and four equivalent Pb2+ atoms to form corner-sharing BrRb2Pb4 octahedra. The corner-sharing octahedra tilt angles range from 0–37°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CsMnBr3 by Materials Project

CsMnBr3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Cs1+ is bonded to twelve equivalent Br1- atoms to form CsBr12 cuboctahedra that share corners with six equivalent CsBr12 cuboctahedra, corners with six equivalent MnBr6 octahedra, faces with eight equivalent CsBr12 cuboctahedra, and faces with six equivalent MnBr6 octahedra. The corner-sharing octahedral tilt angles are 16°. There are six shorter (3.93 Å) and six longer (4.08 Å) Cs–Br bond lengths. Mn2+ is bonded to six equivalent Br1- atoms to form MnBr6 octahedra that share corners with six equivalent CsBr12 cuboctahedra, faces with six equivalent CsBr12 cuboctahedra, and faces with two equivalent MnBr6 octahedra. All Mn–Br bond lengths are 2.70 Å. Br1- is bonded in a 6-coordinate geometry to four equivalent Cs1+ and two equivalent Mn2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CsLiBr2 by Materials Project

CsLiBr2 crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Cs1+ is bonded in a 5-coordinate geometry to nine Br1- atoms. There are a spread of Cs–Br bond distances ranging from 3.69–4.03 Å. Li1+ is bonded to five Br1- atoms to form a mixture of distorted edge and corner-sharing LiBr5 trigonal bipyramids. There are one shorter (2.53 Å) and four longer (2.75 Å) Li–Br bond lengths. There are two inequivalent Br1- sites. In the first Br1- site, Br1- is bonded to five equivalent Cs1+ and one Li1+ atom to form a mixture of distorted edge and corner-sharing BrCs5Li octahedra. The corner-sharing octahedral tilt angles are 10°. In the second Br1- site, Br1- is bonded in a 4-coordinate geometry to four equivalent Cs1+ and four equivalent Li1+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on BaBrF by Materials Project

BaFBr is Matlockite structured and crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Ba2+ is bonded in a 9-coordinate geometry to five equivalent Br1- and four equivalent F1- atoms. There are four shorter (3.45 Å) and one longer (3.46 Å) Ba–Br bond lengths. All Ba–F bond lengths are 2.71 Å. Br1- is bonded in a 5-coordinate geometry to five equivalent Ba2+ and four equivalent F1- atoms. All Br–F bond lengths are 3.51 Å. F1- is bonded to four equivalent Ba2+ and four equivalent Br1- atoms to form a mixture of edge and face-sharing FBa4Br4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on EuBr2 by Materials Project

EuBr2 crystallizes in the tetragonal P4/n space group. The structure is three-dimensional. there are two inequivalent Eu2+ sites. In the first Eu2+ site, Eu2+ is bonded in a 8-coordinate geometry to eight Br1- atoms. There are four shorter (3.15 Å) and four longer (3.16 Å) Eu–Br bond lengths. In the second Eu2+ site, Eu2+ is bonded in a 8-coordinate geometry to eight Br1- atoms. There are a spread of Eu–Br bond distances ranging from 3.12–3.58 Å. There are four inequivalent Br1- sites. In the first Br1- site, Br1- is bonded to four equivalent Eu2+ atoms to form a mixture of edge and corner-sharing BrEu4 tetrahedra. In the second Br1- site, Br1- is bonded to four equivalent Eu2+ atoms to form a mixture of edge and corner-sharing BrEu4 tetrahedra. In the third Br1- site, Br1- is bonded to four Eu2+ atoms to form a mixture of distorted edge and corner-sharing BrEu4 trigonal pyramids. In the fourth Br1- site, Br1- is bonded in a 4-coordinate geometry to four Eu2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KFeBr3 by Materials Project

KFeBr3 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. K1+ is bonded in a 8-coordinate geometry to eight Br1- atoms. There are a spread of K–Br bond distances ranging from 3.42–3.51 Å. Fe2+ is bonded to six Br1- atoms to form edge-sharing FeBr6 octahedra. There are a spread of Fe–Br bond distances ranging from 2.51–2.76 Å. There are three inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a 1-coordinate geometry to four equivalent K1+ and one Fe2+ atom. In the second Br1- site, Br1- is bonded in a 5-coordinate geometry to three equivalent K1+ and two equivalent Fe2+ atoms. In the third Br1- site, Br1- is bonded in a distorted rectangular see-saw-like geometry to one K1+ and three equivalent Fe2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CuW3Br7 by Materials Project

W3CuBr7 crystallizes in the cubic Pn-3 space group. The structure is three-dimensional. W2+ is bonded to five Br1- atoms to form edge-sharing WBr5 square pyramids. There are a spread of W–Br bond distances ranging from 2.64–2.66 Å. Cu1+ is bonded in a trigonal planar geometry to three equivalent Br1- atoms. All Cu–Br bond lengths are 2.40 Å. There are three inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a 12-coordinate geometry to three equivalent W2+ atoms. In the second Br1- site, Br1- is bonded in a 12-coordinate geometry to three equivalent W2+ atoms. In the third Br1- site, Br1- is bonded in a bent 120 degrees geometry to one W2+ and one Cu1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Rb2TeBr6 by Materials Project

Rb2TeBr6 crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Rb1+ is bonded to twelve equivalent Br1- atoms to form RbBr12 cuboctahedra that share corners with twelve equivalent RbBr12 cuboctahedra, faces with six equivalent RbBr12 cuboctahedra, and faces with four equivalent TeBr6 octahedra. All Rb–Br bond lengths are 3.92 Å. Te4+ is bonded to six equivalent Br1- atoms to form TeBr6 octahedra that share faces with eight equivalent RbBr12 cuboctahedra. All Te–Br bond lengths are 2.73 Å. Br1- is bonded in a distorted single-bond geometry to four equivalent Rb1+ and one Te4+ atom.

36 MATERIALS SCIENCE↗