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DOE OSTI2020

Materials Data on NiSn(ClO)6 by Materials Project

NiSn(OCl3)2(O2)2 crystallizes in the triclinic P-1 space group. The structure is one-dimensional and consists of two hydrogen peroxide molecules and one NiSn(OCl3)2 ribbon oriented in the (1, 0, 0) direction. In the NiSn(OCl3)2 ribbon, Ni is bonded in a square co-planar geometry to two equivalent O and two equivalent Cl atoms. Both Ni–O bond lengths are 1.97 Å. Both Ni–Cl bond lengths are 2.35 Å. Sn is bonded in an octahedral geometry to two equivalent O and four Cl atoms. Both Sn–O bond lengths are 2.18 Å. There are two shorter (2.38 Å) and two longer (2.54 Å) Sn–Cl bond lengths. O is bonded in a trigonal planar geometry to one Ni, one Sn, and one Cl atom. The O–Cl bond length is 1.69 Å. There are three inequivalent Cl sites. In the first Cl site, Cl is bonded in an L-shaped geometry to one Ni and one Sn atom. In the second Cl site, Cl is bonded in a single-bond geometry to one O atom. In the third Cl site, Cl is bonded in a single-bond geometry to one Sn atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CsCaTa6Cl18 by Materials Project

CsCaTa6Cl18 crystallizes in the trigonal P-31c space group. The structure is three-dimensional. Cs is bonded in a 12-coordinate geometry to twelve Cl atoms. There are six shorter (3.86 Å) and six longer (3.97 Å) Cs–Cl bond lengths. Ca is bonded to six equivalent Cl atoms to form CaCl6 octahedra that share corners with six equivalent TaCl5 square pyramids. All Ca–Cl bond lengths are 2.82 Å. Ta is bonded to five Cl atoms to form distorted TaCl5 square pyramids that share a cornercorner with one CaCl6 octahedra and corners with four equivalent TaCl5 square pyramids. The corner-sharing octahedral tilt angles are 45°. There are four shorter (2.45 Å) and one longer (2.62 Å) Ta–Cl bond lengths. There are three inequivalent Cl sites. In the first Cl site, Cl is bonded in a 2-coordinate geometry to two equivalent Ta atoms. In the second Cl site, Cl is bonded in a 3-coordinate geometry to one Cs, one Ca, and one Ta atom. In the third Cl site, Cl is bonded in a 2-coordinate geometry to one Cs and two equivalent Ta atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NaHgCl3O2 by Materials Project

NaHgO2Cl3 crystallizes in the orthorhombic Pnma space group. The structure is one-dimensional and consists of four NaHgO2Cl3 ribbons oriented in the (1, 0, 0) direction. Na is bonded to three O and one Cl atom to form distorted corner-sharing NaClO3 tetrahedra. There are two shorter (2.32 Å) and one longer (2.36 Å) Na–O bond lengths. The Na–Cl bond length is 2.90 Å. Hg is bonded in a linear geometry to two Cl atoms. There are one shorter (2.35 Å) and one longer (2.37 Å) Hg–Cl bond lengths. There are two inequivalent O sites. In the first O site, O is bonded in a trigonal planar geometry to two equivalent Na and one Cl atom. The O–Cl bond length is 1.64 Å. In the second O site, O is bonded in a single-bond geometry to one Na atom. There are three inequivalent Cl sites. In the first Cl site, Cl is bonded in a water-like geometry to one Na and one Hg atom. In the second Cl site, Cl is bonded in a single-bond geometry to one O atom. In the third Cl site, Cl is bonded in a single-bond geometry to one Hg atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K2HgCl4O by Materials Project

K2HgOCl4 crystallizes in the orthorhombic Pbam space group. The structure is three-dimensional. there are two inequivalent K sites. In the first K site, K is bonded in a 9-coordinate geometry to two equivalent O and seven Cl atoms. Both K–O bond lengths are 3.15 Å. There are a spread of K–Cl bond distances ranging from 3.14–3.61 Å. In the second K site, K is bonded in a 9-coordinate geometry to two equivalent O and seven Cl atoms. Both K–O bond lengths are 3.00 Å. There are a spread of K–Cl bond distances ranging from 3.11–3.61 Å. Hg is bonded to six Cl atoms to form distorted edge-sharing HgCl6 octahedra. There are a spread of Hg–Cl bond distances ranging from 2.45–3.00 Å. O is bonded in a rectangular see-saw-like geometry to four K atoms. There are three inequivalent Cl sites. In the first Cl site, Cl is bonded to three equivalent K and two equivalent Hg atoms to form distorted ClK3Hg2 trigonal bipyramids that share corners with twelve ClK3Hg2 trigonal bipyramids and edges with eight ClK4Hg trigonal bipyramids. In the second Cl site, Cl is bonded to three equivalent K and two equivalent Hg atoms to form a mixture of edge and corner-sharing ClK3Hg2 trigonal bipyramids. In the third Cl site, Cl is bonded to four K and one Hg atom to form a mixture of distorted edge and corner-sharing ClK4Hg trigonal bipyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on V(ClO2)3 by Materials Project

V(O2Cl)3 crystallizes in the monoclinic P2_1/c space group. The structure is two-dimensional and consists of two V(O2Cl)3 sheets oriented in the (0, 0, 1) direction. V is bonded in a distorted octahedral geometry to four O and two equivalent Cl atoms. All V–O bond lengths are 1.82 Å. Both V–Cl bond lengths are 2.52 Å. There are three inequivalent O sites. In the first O site, O is bonded in a single-bond geometry to one Cl atom. The O–Cl bond length is 1.56 Å. In the second O site, O is bonded in a bent 150 degrees geometry to one V and one Cl atom. The O–Cl bond length is 1.81 Å. In the third O site, O is bonded in a distorted bent 150 degrees geometry to one V and one Cl atom. The O–Cl bond length is 1.91 Å. There are two inequivalent Cl sites. In the first Cl site, Cl is bonded in a square co-planar geometry to four O atoms. In the second Cl site, Cl is bonded in a bent 120 degrees geometry to one V and one O atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Cd(ClO2)2 by Materials Project

(Cd2O3Cl4)2(O2)5 crystallizes in the orthorhombic P2_12_12_1 space group. The structure is one-dimensional and consists of four hydrogen peroxide molecules; four trioxidane molecules; and two Cd2O3Cl4 ribbons oriented in the (0, 0, 1) direction. In each Cd2O3Cl4 ribbon, there are two inequivalent Cd sites. In the first Cd site, Cd is bonded in a rectangular see-saw-like geometry to four Cl atoms. All Cd–Cl bond lengths are 2.55 Å. In the second Cd site, Cd is bonded in a distorted square pyramidal geometry to one O and four Cl atoms. The Cd–O bond length is 2.78 Å. There are a spread of Cd–Cl bond distances ranging from 2.55–2.57 Å. There are three inequivalent O sites. In the first O site, O is bonded in a bent 120 degrees geometry to one Cd and one O atom. The O–O bond length is 1.30 Å. In the second O site, O is bonded in a bent 120 degrees geometry to two O atoms. The O–O bond length is 1.28 Å. In the third O site, O is bonded in a single-bond geometry to one O atom. There are four inequivalent Cl sites. In the first Cl site, Cl is bonded in an L-shaped geometry to two Cd atoms. In the second Cl site, Cl is bonded in an L-shaped geometry to two Cd atoms. In the third Cl site, Cl is bonded in an L-shaped geometry to two Cd atoms. In the fourth Cl site, Cl is bonded in an L-shaped geometry to two Cd atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Cd2Cl4O5 by Materials Project

(CdCl2)4(O2)5 crystallizes in the monoclinic P2_1/c space group. The structure is two-dimensional and consists of four hydrogen peroxide molecules; four trioxidane molecules; and one CdCl2 sheet oriented in the (1, 0, 0) direction. In the CdCl2 sheet, there are two inequivalent Cd sites. In the first Cd site, Cd is bonded to four Cl atoms to form a mixture of distorted corner and edge-sharing CdCl4 tetrahedra. There are a spread of Cd–Cl bond distances ranging from 2.50–2.58 Å. In the second Cd site, Cd is bonded to four Cl atoms to form a mixture of corner and edge-sharing CdCl4 trigonal pyramids. There are a spread of Cd–Cl bond distances ranging from 2.46–2.57 Å. There are four inequivalent Cl sites. In the first Cl site, Cl is bonded in a water-like geometry to two Cd atoms. In the second Cl site, Cl is bonded in an L-shaped geometry to two Cd atoms. In the third Cl site, Cl is bonded in a bent 120 degrees geometry to two Cd atoms. In the fourth Cl site, Cl is bonded in an L-shaped geometry to two Cd atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K2PbCl5 by Materials Project

K2PbCl5 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. K is bonded in a 8-coordinate geometry to eight Cl atoms. There are a spread of K–Cl bond distances ranging from 3.18–3.44 Å. Pb is bonded to seven Cl atoms to form distorted edge-sharing PbCl7 pentagonal bipyramids. There are a spread of Pb–Cl bond distances ranging from 2.76–2.89 Å. There are four inequivalent Cl sites. In the first Cl site, Cl is bonded to four equivalent K and one Pb atom to form ClK4Pb trigonal bipyramids that share corners with nine ClK4Pb trigonal bipyramids, corners with eight equivalent ClK2Pb2 trigonal pyramids, edges with five ClK4Pb trigonal bipyramids, edges with two equivalent ClK2Pb2 trigonal pyramids, and a faceface with one ClK4Pb trigonal bipyramid. In the second Cl site, Cl is bonded to two equivalent K and two equivalent Pb atoms to form ClK2Pb2 trigonal pyramids that share corners with eight ClK4Pb trigonal bipyramids, corners with six equivalent ClK2Pb2 trigonal pyramids, edges with five ClK4Pb trigonal bipyramids, and an edgeedge with one ClK2Pb2 trigonal pyramid. In the third Cl site, Cl is bonded to four equivalent K and one Pb atom to form ClK4Pb trigonal bipyramids that share corners with nine ClK4Pb trigonal bipyramids, corners with four equivalent ClK2Pb2 trigonal pyramids, edges with five ClK4Pb trigonal bipyramids, edges with four equivalent ClK2Pb2 trigonal pyramids, and a faceface with one ClK4Pb trigonal bipyramid. In the fourth Cl site, Cl is bonded to four equivalent K and one Pb atom to form distorted ClK4Pb trigonal bipyramids that share corners with ten ClK4Pb trigonal bipyramids, corners with four equivalent ClK2Pb2 trigonal pyramids, edges with six ClK4Pb trigonal bipyramids, and edges with four equivalent ClK2Pb2 trigonal pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pb12BrCl7O8 by Materials Project

Pb12O8BrCl7 crystallizes in the monoclinic Pm space group. The structure is three-dimensional. there are twelve inequivalent Pb2+ sites. In the first Pb2+ site, Pb2+ is bonded in a 2-coordinate geometry to two equivalent O2-, one Br1-, and four Cl1- atoms. Both Pb–O bond lengths are 2.30 Å. The Pb–Br bond length is 3.63 Å. There are a spread of Pb–Cl bond distances ranging from 2.98–3.32 Å. In the second Pb2+ site, Pb2+ is bonded in a 2-coordinate geometry to two equivalent O2- and four Cl1- atoms. Both Pb–O bond lengths are 2.30 Å. There are a spread of Pb–Cl bond distances ranging from 3.00–3.33 Å. In the third Pb2+ site, Pb2+ is bonded in a 2-coordinate geometry to two equivalent O2-, two equivalent Br1-, and two Cl1- atoms. Both Pb–O bond lengths are 2.31 Å. Both Pb–Br bond lengths are 3.37 Å. There are one shorter (3.02 Å) and one longer (3.20 Å) Pb–Cl bond lengths. In the fourth Pb2+ site, Pb2+ is bonded in a 2-coordinate geometry to two equivalent O2- and four Cl1- atoms. Both Pb–O bond lengths are 2.30 Å. There are a spread of Pb–Cl bond distances ranging from 3.00–3.32 Å. In the fifth Pb2+ site, Pb2+ is bonded in a distorted L-shaped geometry to two equivalent O2-, one Br1-, and three Cl1- atoms. Both Pb–O bond lengths are 2.25 Å. The Pb–Br bond length is 3.12 Å. There are one shorter (3.13 Å) and two longer (3.63 Å) Pb–Cl bond lengths. In the sixth Pb2+ site, Pb2+ is bonded in a 2-coordinate geometry to two equivalent O2- and four Cl1- atoms. Both Pb–O bond lengths are 2.25 Å. There are a spread of Pb–Cl bond distances ranging from 2.94–3.61 Å. In the seventh Pb2+ site, Pb2+ is bonded in a 2-coordinate geometry to two equivalent O2- and four Cl1- atoms. Both Pb–O bond lengths are 2.25 Å. There are a spread of Pb–Cl bond distances ranging from 2.95–3.61 Å. In the eighth Pb2+ site, Pb2+ is bonded in a 2-coordinate geometry to two equivalent O2- and four Cl1- atoms. Both Pb–O bond lengths are 2.25 Å. There are a spread of Pb–Cl bond distances ranging from 2.95–3.61 Å. In the ninth Pb2+ site, Pb2+ is bonded in a 7-coordinate geometry to four O2- and three Cl1- atoms. There are two shorter (2.38 Å) and two longer (2.48 Å) Pb–O bond lengths. There are two shorter (3.44 Å) and one longer (3.45 Å) Pb–Cl bond lengths. In the tenth Pb2+ site, Pb2+ is bonded in a 4-coordinate geometry to four O2-, one Br1-, and two equivalent Cl1- atoms. There are two shorter (2.38 Å) and two longer (2.48 Å) Pb–O bond lengths. The Pb–Br bond length is 3.49 Å. Both Pb–Cl bond lengths are 3.44 Å. In the eleventh Pb2+ site, Pb2+ is bonded in a 7-coordinate geometry to four O2- and three Cl1- atoms. There are two shorter (2.38 Å) and two longer (2.48 Å) Pb–O bond lengths. There are two shorter (3.43 Å) and one longer (3.45 Å) Pb–Cl bond lengths. In the twelfth Pb2+ site, Pb2+ is bonded in a 7-coordinate geometry to four O2- and three Cl1- atoms. There are two shorter (2.38 Å) and two longer (2.48 Å) Pb–O bond lengths. There are two shorter (3.43 Å) and one longer (3.44 Å) Pb–Cl bond lengths. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded to four Pb2+ atoms to form a mixture of distorted edge and corner-sharing OPb4 tetrahedra. In the second O2- site, O2- is bonded to four Pb2+ atoms to form a mixture of distorted edge and corner-sharing OPb4 tetrahedra. In the third O2- site, O2- is bonded to four Pb2+ atoms to form a mixture of distorted edge and corner-sharing OPb4 tetrahedra. In the fourth O2- site, O2- is bonded to four Pb2+ atoms to form a mixture of distorted edge and corner-sharing OPb4 tetrahedra. Br1- is bonded in a 5-coordinate geometry to five Pb2+ and one Cl1- atom. The Br–Cl bond length is 3.81 Å. There are seven inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in a 8-coordinate geometry to seven Pb2+ and one Br1- atom. In the second Cl1- site, Cl1- is bonded in a 7-coordinate geometry to seven Pb2+ atoms. In the third Cl1- site, Cl1- is bonded in a 7-coordinate geometry to seven Pb2+ atoms. In the fourth Cl1- site, Cl1- is bonded in a 7-coordinate geometry to seven Pb2+ atoms. In the fifth Cl1- site, Cl1- is bonded in a 1-coordinate geometry to four Pb2+ atoms. In the sixth Cl1- site, Cl1- is bonded in a 1-coordinate geometry to four Pb2+ atoms. In the seventh Cl1- site, Cl1- is bonded in a 1-coordinate geometry to four Pb2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Cs3Cl5O by Materials Project

(Cs3Cl5)2O2 crystallizes in the hexagonal P6_3 space group. The structure is three-dimensional and consists of two water molecules and one Cs3Cl5 framework. In the Cs3Cl5 framework, Cs is bonded in a 8-coordinate geometry to eight Cl atoms. There are a spread of Cs–Cl bond distances ranging from 3.29–3.85 Å. There are three inequivalent Cl sites. In the first Cl site, Cl is bonded in a 7-coordinate geometry to six equivalent Cs and one Cl atom. The Cl–Cl bond length is 2.66 Å. In the second Cl site, Cl is bonded in a 4-coordinate geometry to four equivalent Cs atoms. In the third Cl site, Cl is bonded in a 7-coordinate geometry to six equivalent Cs and one Cl atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K2InCl5O by Materials Project

K2InOCl5 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. K is bonded in a 8-coordinate geometry to eight Cl atoms. There are a spread of K–Cl bond distances ranging from 3.20–3.56 Å. In is bonded in a distorted octahedral geometry to one O and five Cl atoms. The In–O bond length is 2.21 Å. There are a spread of In–Cl bond distances ranging from 2.50–2.66 Å. O is bonded in a single-bond geometry to one In atom. There are four inequivalent Cl sites. In the first Cl site, Cl is bonded in a distorted trigonal non-coplanar geometry to two equivalent K and one In atom. In the second Cl site, Cl is bonded to four equivalent K and one In atom to form a mixture of distorted edge, corner, and face-sharing ClK4In square pyramids. In the third Cl site, Cl is bonded to four equivalent K and one In atom to form a mixture of distorted edge, corner, and face-sharing ClK4In square pyramids. In the fourth Cl site, Cl is bonded in a distorted rectangular see-saw-like geometry to three equivalent K and one In atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on AlCdCl4 by Materials Project

CdAlCl4 crystallizes in the triclinic P-1 space group. The structure is two-dimensional and consists of two CdAlCl4 sheets oriented in the (0, 0, 1) direction. Cd is bonded in a distorted rectangular see-saw-like geometry to three Cl atoms. There are two shorter (2.76 Å) and one longer (2.79 Å) Cd–Cl bond lengths. Al is bonded in a tetrahedral geometry to four Cl atoms. There are one shorter (2.11 Å) and three longer (2.18 Å) Al–Cl bond lengths. There are four inequivalent Cl sites. In the first Cl site, Cl is bonded in a water-like geometry to one Cd and one Al atom. In the second Cl site, Cl is bonded in a water-like geometry to one Cd and one Al atom. In the third Cl site, Cl is bonded in a single-bond geometry to one Al atom. In the fourth Cl site, Cl is bonded in a water-like geometry to one Cd and one Al atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Cs2TlHCl5 by Materials Project

Cs2TlHCl5 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Cs is bonded in a 10-coordinate geometry to ten Cl atoms. There are a spread of Cs–Cl bond distances ranging from 3.60–3.94 Å. Tl is bonded in an octahedral geometry to one H and five Cl atoms. The Tl–H bond length is 1.81 Å. There are a spread of Tl–Cl bond distances ranging from 2.48–2.66 Å. H is bonded in a single-bond geometry to one Tl atom. There are four inequivalent Cl sites. In the first Cl site, Cl is bonded in a 5-coordinate geometry to four equivalent Cs and one Tl atom. In the second Cl site, Cl is bonded to four equivalent Cs and one Tl atom to form a mixture of distorted corner, edge, and face-sharing ClCs4Tl square pyramids. In the third Cl site, Cl is bonded in a distorted single-bond geometry to four equivalent Cs and one Tl atom. In the fourth Cl site, Cl is bonded to four equivalent Cs and one Tl atom to form a mixture of distorted corner, edge, and face-sharing ClCs4Tl square pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CsLaCl4O3 by Materials Project

CsLaO3Cl4 crystallizes in the monoclinic P2_1/m space group. The structure is three-dimensional. Cs is bonded in a 7-coordinate geometry to one O and six Cl atoms. The Cs–O bond length is 3.31 Å. There are a spread of Cs–Cl bond distances ranging from 3.60–3.70 Å. La is bonded in a 3-coordinate geometry to three O and six Cl atoms. There are a spread of La–O bond distances ranging from 2.39–2.53 Å. There are a spread of La–Cl bond distances ranging from 2.92–2.96 Å. There are three inequivalent O sites. In the first O site, O is bonded in a 2-coordinate geometry to one Cs and one La atom. In the second O site, O is bonded in a single-bond geometry to one La and two equivalent Cl atoms. Both O–Cl bond lengths are 2.48 Å. In the third O site, O is bonded in a single-bond geometry to one La and two equivalent Cl atoms. Both O–Cl bond lengths are 2.47 Å. There are two inequivalent Cl sites. In the first Cl site, Cl is bonded in a 3-coordinate geometry to one Cs and two equivalent La atoms. In the second Cl site, Cl is bonded in a 3-coordinate geometry to two equivalent Cs, one La, and two O atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba2H14Cl4O15 by Materials Project

Ba2H10O13Cl4(H2O)2 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional and consists of eight water molecules and one Ba2H10O13Cl4 framework. In the Ba2H10O13Cl4 framework, Ba is bonded in a 10-coordinate geometry to ten O atoms. There are a spread of Ba–O bond distances ranging from 2.80–3.15 Å. There are five inequivalent H sites. In the first H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.98 Å. In the second H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 1.00 Å. In the third H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 1.00 Å. In the fourth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 1.00 Å. In the fifth H site, H is bonded in a single-bond geometry to two O atoms. There is one shorter (1.00 Å) and one longer (1.72 Å) H–O bond length. There are seven inequivalent O sites. In the first O site, O is bonded in a water-like geometry to two equivalent Ba and two H atoms. In the second O site, O is bonded in a water-like geometry to one Ba and two H atoms. In the third O site, O is bonded in a water-like geometry to two equivalent H atoms. In the fourth O site, O is bonded in a trigonal planar geometry to two equivalent Ba and one Cl atom. The O–Cl bond length is 1.58 Å. In the fifth O site, O is bonded in a trigonal planar geometry to two equivalent Ba and one Cl atom. The O–Cl bond length is 1.59 Å. In the sixth O site, O is bonded in a distorted single-bond geometry to two equivalent Ba and one Cl atom. The O–Cl bond length is 1.58 Å. In the seventh O site, O is bonded in a 2-coordinate geometry to one Ba, one H, and one Cl atom. The O–Cl bond length is 1.59 Å. There are two inequivalent Cl sites. In the first Cl site, Cl is bonded in a water-like geometry to two O atoms. In the second Cl site, Cl is bonded in a water-like geometry to two O atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2025

Changing-look Active Galactic Nuclei from the Dark Energy Spectroscopic Instrument. II. Statistical Properties from the First Data Release

We present the identification of changing-look active galactic nuclei (CL-AGNs) from the Dark Energy Spectroscopic Instrument First Data Release and Sloan Digital Sky Survey Data Release 16 at z ≤ 0.9. To confirm the CL-AGNs, we utilize spectral flux calibration assessment via an [O III ]-based calibration, pseudophotometry examination, and visual inspection. This rigorous selection process allows us to compile a statistical catalog of 561 CL-AGNs, encompassing 527 Hβ, 149 Hα, and 129 Mg II CL behaviors. In this sample, we find (1) a 283:278 ratio of turn-on to turn-off CL-AGNs. (2) The median Eddington ratio for CL-AGNs in the dim state is approximately λ Edd ∼ 0.01. (3) A strong correlation between the change in the luminosity of the broad emission lines (BELs) and variation in the continuum luminosity, with Mg II and Hβ displaying similar responses during CL phases. (4) The Baldwin–Phillips–Terlevich diagram for CL-AGNs shows no statistical difference from the general AGN catalog. (5) Five CL-AGNs are associated with asymmetrical mid-infrared flares, possibly linked to tidal disruption events. Given the large CL-AGN sample and the stochastic sampling of spectra, we propose that some CL phenomena are inherently due to typical AGN variability during low accretion rates, particularly for CL phenomenon only occurring on one BEL. Finally, we introduce a monotonically dimming CL phase for objects characterized by a gradual decline over decades in the light curve and the complete disappearance of entire BELs in faint spectra, indicative of a real transition in the accretion disk.

accretion↗
DOE OSTI2025

Changing-look Active Galactic Nuclei from the Dark Energy Spectroscopic Instrument. II. Statistical Properties from the First Data Release

We present the identification of changing-look active galactic nuclei (CL-AGNs) from the Dark Energy Spectroscopic Instrument First Data Release and Sloan Digital Sky Survey Data Release 16 at z≤ 0.9. To confirm the CL-AGNs, we utilize spectral flux calibration assessment via an [O iii]-based calibration, pseudophotometry examination, and visual inspection. This rigorous selection process allows us to compile a statistical catalog of 561 CL-AGNs, encompassing 527 Hβ, 149 Hα, and 129 Mg ii CL behaviors. In this sample, we find (1) a 283:278 ratio of turn-on to turn-off CL-AGNs. (2) The median Eddington ratio for CL-AGNs in the dim state is approximately λ$_{Edd}$ ∼ 0.01. (3) A strong correlation between the change in the luminosity of the broad emission lines (BELs) and variation in the continuum luminosity, with Mg ii and Hβ displaying similar responses during CL phases. (4) The Baldwin–Phillips–Terlevich diagram for CL-AGNs shows no statistical difference from the general AGN catalog. (5) Five CL-AGNs are associated with asymmetrical mid-infrared flares, possibly linked to tidal disruption events. Given the large CL-AGN sample and the stochastic sampling of spectra, we propose that some CL phenomena are inherently due to typical AGN variability during low accretion rates, particularly for CL phenomenon only occurring on one BEL. Finally, we introduce a monotonically dimming CL phase for objects characterized by a gradual decline over decades in the light curve and the complete disappearance of entire BELs in faint spectra, indicative of a real transition in the accretion disk.

79 ASTRONOMY AND ASTROPHYSICS↗
DOE OSTI2020

Materials Data on Bi24Cl10O31 by Materials Project

Bi24O31Cl10 is alpha Pu-derived structured and crystallizes in the monoclinic P2/c space group. The structure is three-dimensional. there are twelve inequivalent Bi3+ sites. In the first Bi3+ site, Bi3+ is bonded in a distorted body-centered cubic geometry to eight O2- atoms. There are a spread of Bi–O bond distances ranging from 2.31–2.72 Å. In the second Bi3+ site, Bi3+ is bonded in a 3-coordinate geometry to three O2- and four Cl1- atoms. There are one shorter (2.11 Å) and two longer (2.15 Å) Bi–O bond lengths. There are a spread of Bi–Cl bond distances ranging from 3.29–3.46 Å. In the third Bi3+ site, Bi3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Bi–O bond distances ranging from 2.30–2.99 Å. In the fourth Bi3+ site, Bi3+ is bonded in a 4-coordinate geometry to four O2- and three Cl1- atoms. There are a spread of Bi–O bond distances ranging from 2.18–2.36 Å. There are a spread of Bi–Cl bond distances ranging from 3.29–3.44 Å. In the fifth Bi3+ site, Bi3+ is bonded in a 5-coordinate geometry to five O2- and one Cl1- atom. There are a spread of Bi–O bond distances ranging from 2.24–2.44 Å. The Bi–Cl bond length is 3.51 Å. In the sixth Bi3+ site, Bi3+ is bonded in a 4-coordinate geometry to four O2- and four Cl1- atoms. There are a spread of Bi–O bond distances ranging from 2.26–2.29 Å. There are a spread of Bi–Cl bond distances ranging from 3.32–3.37 Å. In the seventh Bi3+ site, Bi3+ is bonded in a 6-coordinate geometry to six O2- and two Cl1- atoms. There are a spread of Bi–O bond distances ranging from 2.25–2.69 Å. There are one shorter (3.30 Å) and one longer (3.38 Å) Bi–Cl bond lengths. In the eighth Bi3+ site, Bi3+ is bonded in a 3-coordinate geometry to three O2- and three Cl1- atoms. There are a spread of Bi–O bond distances ranging from 2.11–2.16 Å. There are a spread of Bi–Cl bond distances ranging from 3.26–3.50 Å. In the ninth Bi3+ site, Bi3+ is bonded in a 6-coordinate geometry to six O2- and two Cl1- atoms. There are a spread of Bi–O bond distances ranging from 2.23–2.60 Å. There are one shorter (3.26 Å) and one longer (3.44 Å) Bi–Cl bond lengths. In the tenth Bi3+ site, Bi3+ is bonded in a 4-coordinate geometry to four O2- and four Cl1- atoms. There are a spread of Bi–O bond distances ranging from 2.18–2.40 Å. There are a spread of Bi–Cl bond distances ranging from 3.39–3.53 Å. In the eleventh Bi3+ site, Bi3+ is bonded in a 4-coordinate geometry to four O2- and four Cl1- atoms. There are a spread of Bi–O bond distances ranging from 2.24–2.31 Å. There are a spread of Bi–Cl bond distances ranging from 3.25–3.40 Å. In the twelfth Bi3+ site, Bi3+ is bonded in a 4-coordinate geometry to four O2- and four Cl1- atoms. There are a spread of Bi–O bond distances ranging from 2.22–2.33 Å. There are a spread of Bi–Cl bond distances ranging from 3.42–3.54 Å. There are sixteen inequivalent O2- sites. In the first O2- site, O2- is bonded to four Bi3+ atoms to form distorted OBi4 tetrahedra that share corners with three OBi4Cl tetrahedra and edges with four OBi4 tetrahedra. In the second O2- site, O2- is bonded to four Bi3+ atoms to form a mixture of distorted corner and edge-sharing OBi4 tetrahedra. In the third O2- site, O2- is bonded in a 3-coordinate geometry to four Bi3+ atoms. In the fourth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to four Bi3+ atoms. In the fifth O2- site, O2- is bonded to four Bi3+ atoms to form a mixture of distorted corner and edge-sharing OBi4 tetrahedra. In the sixth O2- site, O2- is bonded in a 3-coordinate geometry to three Bi3+ atoms. In the seventh O2- site, O2- is bonded to four Bi3+ and one Cl1- atom to form a mixture of distorted corner and edge-sharing OBi4Cl tetrahedra. The O–Cl bond length is 3.39 Å. In the eighth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to three Bi3+ and one Cl1- atom. The O–Cl bond length is 3.31 Å. In the ninth O2- site, O2- is bonded in a 2-coordinate geometry to four Bi3+ atoms. In the tenth O2- site, O2- is bonded to four Bi3+ atoms to form a mixture of distorted corner and edge-sharing OBi4 tetrahedra. In the eleventh O2- site, O2- is bonded to four Bi3+ atoms to form a mixture of distorted corner and edge-sharing OBi4 tetrahedra. In the twelfth O2- site, O2- is bonded in a 4-coordinate geometry to four Bi3+ atoms. In the thirteenth O2- site, O2- is bonded in a 4-coordinate geometry to four Bi3+ atoms. In the fourteenth O2- site, O2- is bonded to four Bi3+ atoms to form a mixture of distorted corner and edge-sharing OBi4 tetrahedra. In the fifteenth O2- site, O2- is bonded to four Bi3+ atoms to form a mixture of distorted corner and edge-sharing OBi4 tetrahedra. In the sixteenth O2- site, O2- is bonded in a distorted see-saw-like geometry to four Bi3+ atoms. There are six inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in a 6-coordinate geometry to six Bi3+ atoms. In the second Cl1- site, Cl1- is bonded in a 8-coordinate geometry to six Bi3+ and two O2- atoms. In the third Cl1- site, Cl1- is bonded in a 2-coordinate geometry to six Bi3+ atoms. In the fourth Cl1- site, Cl1- is bonded in a 4-coordinate geometry to six Bi3+ atoms. In the fifth Cl1- site, Cl1- is bonded in a 7-coordinate geometry to seven Bi3+ atoms. In the sixth Cl1- site, Cl1- is bonded in a 6-coordinate geometry to six Bi3+ atoms.

36 MATERIALS SCIENCE↗