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All sourcesNASA NTRSDOE OSTI
NASA NTRS2013

Constraints on the Composition and Evolution of the Lunar Crust from Meteorite NWA 3163

The lunar meteorite NWA 3163 (paired with NWA 4881, 4483) is a ferroan, feldspathic granulitic breccia characterized by pigeonite, augite, olivine, maskelynite and accessory Tichromite, ilmenite and troilite. Bulk rock geochemical signatures indicate the lack of a KREEP- derived component (Eu/Eu* = 3.47), consistent with previously studied lunar granulites and anorthosites. Bulk rock chondrite-normalized signatures are however distinct from the anorthosites and granulites sampled by Apollo missions and are relatively REE-depleted. In-situ analyses of maskelynite reveal little variation in anorthite content (average An% is 96.9 +/- 1.6, 2 sigma). Olivine is relatively ferroan and exhibits very little variation in forsterite content with mean Fo% of 57.7 +/- 2.0 (2 sigma). The majority of pyroxene is low-Ca pigeonite (En57Fs33Wo10). Augite (En46Fs21Wo33) is less common, comprising approximately 10% of analyzed pyroxene. Two pyroxene thermometry on co-existing orthopyroxene and augite yield an equilibrium temperature of 1070C which is in reasonable agreement with temperatures of 1096C estimated from pigeonite compositions. Rb-Sr isotopic systematics of separated fractions yield an average measured Sr-87/Sr-87 of 0.699282+/-0.000007 (2 sigma). Sr model ages are calculated using a modern day Sr-87/Sr-86 Basaltic Achondrite Best Initial (BABI) value of 0.70475, from an initial BABI value Sr-87/Sr-86 of 0.69891 and a corresponding Rb-87/Sr-97 of 0.08716. The Sr model Thermomechanical analysis (TMA) age, which represents the time of separation of a melt from a source reservoir having chondritic evolution, is 4.56+/-0.1 Ga. A Sr model T(sub RD) age, which is a Rb depletion age and assumes no contribution from Rb in the sample in the calculation, yields 4.34+/-0.1 Ga (i.e. a minimum age). The Ar-Ar dating of paired meteorite NWA 4881 reveals an age of c. 2 Ga, likely representing the last thermal event this meteorite experienced. An older Ar-40/Ar-39 age of c. 3.5 Ga may record the thermal event which produced the granulitic texture. Additional chronological constraints will be provided by Sm-Nd systematics. Ferroan Anorthosites like NWA 3163 have been interpreted to represent direct lunar magma ocean (LMO) crystallization products. If this is the case, trace element concentrations in NWA 3163 primary mineral phases should be in equilibrium with residual LMO liquids present during crystallization of those phases. Results from petrogenetic modeling suggest that the NWA 3163 protolith did not form from crystallization of an initially LREE depleted LMO but rather require an initially chondritic LMO with early garnet crystallization. Furthermore, a two-stage crystallization model where plagioclase crystalized prior to pyroxene (93% vs. 99.5% of LMO crystallization) is implied.

McLeod, C. L.↗
DOE OSTI2020

Materials Data on RbCoCuF6 by Materials Project

RbCoCuF6 crystallizes in the orthorhombic Imma space group. The structure is three-dimensional. Rb1+ is bonded to six F1- atoms to form RbF6 octahedra that share corners with six equivalent CoF6 octahedra and corners with six equivalent CuF6 octahedra. The corner-sharing octahedra tilt angles range from 67–68°. There are five shorter (3.10 Å) and one longer (3.17 Å) Rb–F bond lengths. Co3+ is bonded to six F1- atoms to form CoF6 octahedra that share corners with two equivalent CoF6 octahedra, corners with four equivalent CuF6 octahedra, and corners with six equivalent RbF6 octahedra. The corner-sharing octahedra tilt angles range from 44–68°. There is four shorter (1.93 Å) and two longer (1.98 Å) Co–F bond length. Cu2+ is bonded to six F1- atoms to form CuF6 octahedra that share corners with two equivalent CuF6 octahedra, corners with four equivalent CoF6 octahedra, and corners with six equivalent RbF6 octahedra. The corner-sharing octahedra tilt angles range from 45–68°. There is two shorter (1.96 Å) and four longer (2.03 Å) Cu–F bond length. There are three inequivalent F1- sites. In the first F1- site, F1- is bonded in a 2-coordinate geometry to one Rb1+ and two equivalent Co3+ atoms. In the second F1- site, F1- is bonded in a 2-coordinate geometry to one Rb1+ and two equivalent Cu2+ atoms. In the third F1- site, F1- is bonded in a 2-coordinate geometry to one Rb1+, one Co3+, and one Cu2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on RbCoNiF6 by Materials Project

RbCoNiF6 crystallizes in the orthorhombic Imma space group. The structure is three-dimensional. Rb1+ is bonded to six F1- atoms to form RbF6 octahedra that share corners with six equivalent CoF6 octahedra and corners with six equivalent NiF6 octahedra. The corner-sharing octahedra tilt angles range from 66–69°. There are a spread of Rb–F bond distances ranging from 2.97–3.17 Å. Co3+ is bonded to six F1- atoms to form CoF6 octahedra that share corners with two equivalent CoF6 octahedra, corners with four equivalent NiF6 octahedra, and corners with six equivalent RbF6 octahedra. The corner-sharing octahedra tilt angles range from 42–69°. There is four shorter (1.90 Å) and two longer (1.98 Å) Co–F bond length. Ni2+ is bonded to six F1- atoms to form NiF6 octahedra that share corners with two equivalent NiF6 octahedra, corners with four equivalent CoF6 octahedra, and corners with six equivalent RbF6 octahedra. The corner-sharing octahedra tilt angles range from 45–69°. There are two shorter (2.00 Å) and four longer (2.04 Å) Ni–F bond lengths. There are three inequivalent F1- sites. In the first F1- site, F1- is bonded in a 2-coordinate geometry to one Rb1+ and two equivalent Co3+ atoms. In the second F1- site, F1- is bonded in a distorted trigonal planar geometry to one Rb1+ and two equivalent Ni2+ atoms. In the third F1- site, F1- is bonded in a 2-coordinate geometry to one Rb1+, one Co3+, and one Ni2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on RbMgCoF6 by Materials Project

RbMgCoF6 crystallizes in the orthorhombic Imma space group. The structure is three-dimensional. Rb1+ is bonded to six F1- atoms to form RbF6 octahedra that share corners with six equivalent MgF6 octahedra and corners with six equivalent CoF6 octahedra. The corner-sharing octahedra tilt angles range from 68–69°. There are a spread of Rb–F bond distances ranging from 3.10–3.28 Å. Mg2+ is bonded to six F1- atoms to form MgF6 octahedra that share corners with two equivalent MgF6 octahedra, corners with four equivalent CoF6 octahedra, and corners with six equivalent RbF6 octahedra. The corner-sharing octahedra tilt angles range from 43–69°. There is two shorter (1.96 Å) and four longer (2.03 Å) Mg–F bond length. Co3+ is bonded to six F1- atoms to form CoF6 octahedra that share corners with two equivalent CoF6 octahedra, corners with four equivalent MgF6 octahedra, and corners with six equivalent RbF6 octahedra. The corner-sharing octahedra tilt angles range from 42–69°. There is four shorter (1.92 Å) and two longer (1.97 Å) Co–F bond length. There are three inequivalent F1- sites. In the first F1- site, F1- is bonded in a distorted bent 150 degrees geometry to one Rb1+ and two equivalent Co3+ atoms. In the second F1- site, F1- is bonded in a 2-coordinate geometry to one Rb1+ and two equivalent Mg2+ atoms. In the third F1- site, F1- is bonded in a 2-coordinate geometry to one Rb1+, one Mg2+, and one Co3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on RbCrCoF6 by Materials Project

RbCoCrF6 crystallizes in the orthorhombic Imma space group. The structure is three-dimensional. Rb1+ is bonded to six F1- atoms to form RbF6 octahedra that share corners with six equivalent CrF6 octahedra and corners with six equivalent CoF6 octahedra. The corner-sharing octahedra tilt angles range from 66–70°. There are a spread of Rb–F bond distances ranging from 3.09–3.29 Å. Cr3+ is bonded to six F1- atoms to form CrF6 octahedra that share corners with two equivalent CrF6 octahedra, corners with four equivalent CoF6 octahedra, and corners with six equivalent RbF6 octahedra. The corner-sharing octahedra tilt angles range from 41–70°. There is four shorter (1.94 Å) and two longer (1.97 Å) Cr–F bond length. Co2+ is bonded to six F1- atoms to form CoF6 octahedra that share corners with two equivalent CoF6 octahedra, corners with four equivalent CrF6 octahedra, and corners with six equivalent RbF6 octahedra. The corner-sharing octahedra tilt angles range from 45–69°. There are two shorter (2.01 Å) and four longer (2.07 Å) Co–F bond lengths. There are three inequivalent F1- sites. In the first F1- site, F1- is bonded in a distorted bent 150 degrees geometry to one Rb1+ and two equivalent Cr3+ atoms. In the second F1- site, F1- is bonded in a 3-coordinate geometry to one Rb1+ and two equivalent Co2+ atoms. In the third F1- site, F1- is bonded in a 2-coordinate geometry to one Rb1+, one Cr3+, and one Co2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Rb2Hg2PdBr8 by Materials Project

Rb2PdHg2Br8 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Rb1+ is bonded in a 10-coordinate geometry to ten Br1- atoms. There are a spread of Rb–Br bond distances ranging from 3.59–4.00 Å. Pd2+ is bonded in a square co-planar geometry to four equivalent Br1- atoms. All Pd–Br bond lengths are 2.48 Å. Hg2+ is bonded in a 2-coordinate geometry to five Br1- atoms. There are a spread of Hg–Br bond distances ranging from 2.49–3.50 Å. There are three inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a distorted single-bond geometry to two equivalent Rb1+ and one Hg2+ atom. In the second Br1- site, Br1- is bonded to three equivalent Rb1+, one Pd2+, and one Hg2+ atom to form a mixture of distorted corner, edge, and face-sharing BrRb3HgPd square pyramids. In the third Br1- site, Br1- is bonded in a distorted single-bond geometry to two equivalent Rb1+ and two equivalent Hg2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Rb2Hg2PdCl8 by Materials Project

Rb2PdHg2Cl8 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Rb1+ is bonded in a 10-coordinate geometry to ten Cl1- atoms. There are a spread of Rb–Cl bond distances ranging from 3.44–3.87 Å. Pd2+ is bonded in a square co-planar geometry to four equivalent Cl1- atoms. All Pd–Cl bond lengths are 2.33 Å. Hg2+ is bonded in a 2-coordinate geometry to five Cl1- atoms. There are a spread of Hg–Cl bond distances ranging from 2.35–3.27 Å. There are three inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in a distorted single-bond geometry to two equivalent Rb1+ and two equivalent Hg2+ atoms. In the second Cl1- site, Cl1- is bonded to three equivalent Rb1+, one Pd2+, and one Hg2+ atom to form a mixture of distorted corner, edge, and face-sharing ClRb3HgPd square pyramids. In the third Cl1- site, Cl1- is bonded in a distorted single-bond geometry to two equivalent Rb1+ and one Hg2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Rb2CoO3 by Materials Project

Rb2CoO3 crystallizes in the orthorhombic Cmc2_1 space group. The structure is three-dimensional. Rb1+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Rb–O bond distances ranging from 2.87–3.32 Å. Co4+ is bonded to five O2- atoms to form distorted edge-sharing CoO5 trigonal bipyramids. There is one shorter (1.80 Å) and four longer (1.90 Å) Co–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to four equivalent Rb1+ and two equivalent Co4+ atoms. In the second O2- site, O2- is bonded in a distorted single-bond geometry to six equivalent Rb1+ and one Co4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Rb2NaCo(CN)6 by Materials Project

Rb2Na(CN)6Co crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional and consists of two cobalt molecules and one Rb2Na(CN)6 framework. In the Rb2Na(CN)6 framework, Rb1+ is bonded in a 7-coordinate geometry to seven N3- atoms. There are a spread of Rb–N bond distances ranging from 3.07–3.66 Å. Na1+ is bonded in an octahedral geometry to six N3- atoms. There are a spread of Na–N bond distances ranging from 2.53–2.57 Å. There are three inequivalent C+2.33+ sites. In the first C+2.33+ site, C+2.33+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.18 Å. In the second C+2.33+ site, C+2.33+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.18 Å. In the third C+2.33+ site, C+2.33+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.18 Å. There are three inequivalent N3- sites. In the first N3- site, N3- is bonded in a 2-coordinate geometry to two equivalent Rb1+, one Na1+, and one C+2.33+ atom. In the second N3- site, N3- is bonded in a 1-coordinate geometry to two equivalent Rb1+, one Na1+, and one C+2.33+ atom. In the third N3- site, N3- is bonded in a 2-coordinate geometry to three equivalent Rb1+, one Na1+, and one C+2.33+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on RbB(CN)2 by Materials Project

RbB(CN)2 crystallizes in the tetragonal I4_1/a space group. The structure is three-dimensional. Rb1+ is bonded in a square co-planar geometry to four equivalent N3- atoms. There are two shorter (2.90 Å) and two longer (3.04 Å) Rb–N bond lengths. B3+ is bonded in a linear geometry to two equivalent C1+ atoms. Both B–C bond lengths are 1.44 Å. C1+ is bonded in a distorted linear geometry to one B3+ and one N3- atom. The C–N bond length is 1.20 Å. N3- is bonded in a distorted trigonal non-coplanar geometry to two equivalent Rb1+ and one C1+ atom.

36 MATERIALS SCIENCE↗
NASA NTRS1980

On the chemical composition of L-chondrites

Radiochemical neutron activation analysis of Ag, As, Au, Bi, Co, Cs, Ga, In, Rb, Sb, Te, Tl, and Zn and major element data in 14 L4-6 and 3 LL5 chondrites indicates that the L group is unusually variable and may represent at least 2 subgroups differing in formation history. Chemical trends in the S/Fe rich subgroup support textural evidence indicating late loss of a shock formed Fe-Ni-S melt; the S/Fe poor subgroup seemingly reflects nebular fractionation only. Highly mobile In and Zn apparently reflect shock induced loss from L chondrites. However, contrasting chemical trends in several L chondrite sample sets indicate that these meteorites constitute a more irregular sampling of, or more heterogeneous parent material than do carbonaceous or enstatite chondrites. Data for 15 chondrites suggest higher formation temperatures and/or degrees of shock than for LL5 chondrites.

Neal, C. W.↗
NASA NTRS1981

Chemical studies of L-chondrites. I - A study of possible chemical sub-groups

Radiochemical neutron activation analysis of Ag, As, Au, Bi, Co, Cs, Ga, In, Rb, Sb, Te, Tl and Zn and major element data in 14 L4-6 and 3 LL5 chondrites indicates that the L-group is unusually variable and may represent at least 2 sub-groups differing in formation history. Chemical trends in the S/Fe-rich sub-group support textural evidence indicating late loss of a shock-formed Fe-Ni-S melt; the S/Fe-poor sub-group seemingly reflects nebular fractionation only. Highly mobile In and Zn apparently reflect shock-induced loss from L-chondrites. Data for L5 chondrites suggest higher formation temperatures and/or degrees of shock than for LL5 chondrites.

Neal, C. W.↗
NASA NTRS1972

Meteoritic and non-meteoritic trace elements in Luna 16 samples.

Two Luna 16 soils have been analyzed for Ag, Au, Bi, Br, Cd, Co, Cs, Cu, Ga, Ge, In, Ur, Ni, Rb, Re, Sb, Se, Te, Tl, and Zn. A meteoritic component similar to that in Apollo 11 and 12 soils seems to be present, corresponding to about 1.5 to 2% Cl chondrites or equivalent. It probably consists largely of micrometeorites. Three elements show strong enrichments compared to Apollo 11 and 12 soils: Cd (5 x to 200 x), Ag (5 x to 10 x), and Bi (3 x). Presumably these elements were brought in by Cd-Ag-Bi rich material, similar to that in Unit VI of Apollo core 12028.

Laul, J. C.↗
DOE OSTI2020

Materials Data on Rb2CuH4(Cl2O)2 by Materials Project

Rb2CuH4(OCl2)2 crystallizes in the tetragonal P4_2/mnm space group. The structure is three-dimensional. Rb1+ is bonded in a body-centered cubic geometry to eight Cl1- atoms. All Rb–Cl bond lengths are 3.45 Å. Cu2+ is bonded in a distorted square co-planar geometry to two equivalent O2- and two equivalent Cl1- atoms. Both Cu–O bond lengths are 1.98 Å. Both Cu–Cl bond lengths are 2.27 Å. H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 1.00 Å. O2- is bonded in a distorted trigonal planar geometry to one Cu2+ and two equivalent H1+ atoms. There are two inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in a 7-coordinate geometry to four equivalent Rb1+ atoms. In the second Cl1- site, Cl1- is bonded in a distorted single-bond geometry to four equivalent Rb1+ and one Cu2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on RbMg14BO15 by Materials Project

RbMg14BO15 crystallizes in the orthorhombic Pmm2 space group. The structure is three-dimensional. Rb is bonded in a 2-coordinate geometry to five O atoms. There are a spread of Rb–O bond distances ranging from 2.33–2.80 Å. There are ten inequivalent Mg sites. In the first Mg site, Mg is bonded to five O atoms to form MgO5 square pyramids that share corners with two equivalent MgO6 octahedra, corners with two equivalent MgO5 square pyramids, and edges with eight MgO6 octahedra. The corner-sharing octahedral tilt angles are 3°. There are a spread of Mg–O bond distances ranging from 2.03–2.26 Å. In the second Mg site, Mg is bonded to six O atoms to form MgO6 octahedra that share corners with two equivalent MgO6 octahedra, corners with two equivalent MgO5 square pyramids, and edges with ten MgO6 octahedra. The corner-sharing octahedral tilt angles are 5°. There are a spread of Mg–O bond distances ranging from 2.00–2.31 Å. In the third Mg site, Mg is bonded to six O atoms to form a mixture of edge and corner-sharing MgO6 octahedra. The corner-sharing octahedra tilt angles range from 2–31°. There are a spread of Mg–O bond distances ranging from 1.99–2.35 Å. In the fourth Mg site, Mg is bonded to six O atoms to form MgO6 octahedra that share corners with six MgO6 octahedra, edges with seven MgO6 octahedra, and edges with two equivalent MgO5 square pyramids. The corner-sharing octahedra tilt angles range from 1–3°. There are a spread of Mg–O bond distances ranging from 2.04–2.39 Å. In the fifth Mg site, Mg is bonded in a distorted T-shaped geometry to three O atoms. There are one shorter (2.06 Å) and two longer (2.09 Å) Mg–O bond lengths. In the sixth Mg site, Mg is bonded to six O atoms to form a mixture of distorted edge and corner-sharing MgO6 octahedra. The corner-sharing octahedra tilt angles range from 0–23°. There are a spread of Mg–O bond distances ranging from 2.07–2.56 Å. In the seventh Mg site, Mg is bonded to six O atoms to form MgO6 octahedra that share corners with four MgO6 octahedra, edges with eight MgO6 octahedra, and edges with two equivalent MgO5 square pyramids. The corner-sharing octahedra tilt angles range from 1–7°. There are a spread of Mg–O bond distances ranging from 1.99–2.27 Å. In the eighth Mg site, Mg is bonded to six O atoms to form a mixture of edge and corner-sharing MgO6 octahedra. The corner-sharing octahedra tilt angles range from 0–5°. There are a spread of Mg–O bond distances ranging from 2.05–2.26 Å. In the ninth Mg site, Mg is bonded in a 5-coordinate geometry to five O atoms. There are a spread of Mg–O bond distances ranging from 1.94–2.64 Å. In the tenth Mg site, Mg is bonded to six O atoms to form MgO6 octahedra that share corners with four equivalent MgO6 octahedra, edges with nine MgO6 octahedra, and an edgeedge with one MgO5 square pyramid. The corner-sharing octahedra tilt angles range from 4–9°. There are a spread of Mg–O bond distances ranging from 2.01–2.26 Å. B is bonded in a distorted trigonal planar geometry to three O atoms. There is two shorter (1.44 Å) and one longer (1.50 Å) B–O bond length. There are eleven inequivalent O sites. In the first O site, O is bonded to five Mg atoms to form OMg5 trigonal bipyramids that share a cornercorner with one OMg5B octahedra, corners with two equivalent OMg5 trigonal bipyramids, and edges with eight OMg6 octahedra. The corner-sharing octahedral tilt angles are 0°. In the second O site, O is bonded to one Rb and five Mg atoms to form distorted ORbMg5 octahedra that share corners with four ORbMg5 octahedra and edges with eight OMg6 octahedra. The corner-sharing octahedra tilt angles range from 1–7°. In the third O site, O is bonded to five Mg and one B atom to form distorted OMg5B octahedra that share corners with four ORbMg5 octahedra, a cornercorner with one OMg5 trigonal bipyramid, and edges with eight OMg6 octahedra. The corner-sharing octahedra tilt angles range from 1–5°. In the fourth O site, O is bonded to six Mg atoms to form OMg6 octahedra that share corners with six OMg6 octahedra, edges with four OMg6 octahedra, and edges with two equivalent OMg5 trigonal bipyramids. The corner-sharing octahedra tilt angles range from 1–16°. In the fifth O site, O is bonded to six Mg atoms to form OMg6 octahedra that share corners with six OMg6 octahedra and edges with eight ORbMg5 octahedra. The corner-sharing octahedra tilt angles range from 0–4°. In the sixth O site, O is bonded in a 5-coordinate geometry to two equivalent Rb and three Mg atoms. In the seventh O site, O is bonded in a square co-planar geometry to four Mg atoms. In the eighth O site, O is bonded to six Mg atoms to form OMg6 octahedra that share corners with four OMg6 octahedra and edges with ten ORbMg5 octahedra. The corner-sharing octahedra tilt angles range from 1–2°. In the ninth O site, O is bonded to six Mg atoms to form OMg6 octahedra that share corners with four OMg6 octahedra, edges with ten OMg5B octahedra, and edges with two equivalent OMg5 trigonal bipyramids. The corner-sharing octahedra tilt angles range from 1–5°. In the tenth O site, O is bonded in a distorted single-bond geometry to one Rb, four Mg, and one B atom. In the eleventh O site, O is bonded to six Mg atoms to form OMg6 octahedra that share corners with four equivalent OMg6 octahedra, edges with ten ORbMg5 octahedra, and an edgeedge with one OMg5 trigonal bipyramid. The corner-sharing octahedra tilt angles range from 1–4°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on RbAu(SeO4)2 by Materials Project

RbAu(SeO4)2 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Rb1+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of Rb–O bond distances ranging from 2.95–3.41 Å. Au5+ is bonded in a square co-planar geometry to four equivalent O2- atoms. All Au–O bond lengths are 2.03 Å. Se5+ is bonded in a tetrahedral geometry to four O2- atoms. There is two shorter (1.64 Å) and two longer (1.75 Å) Se–O bond length. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Rb1+ and one Se5+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to one Rb1+ and one Se5+ atom. In the third O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Rb1+, one Au5+, and one Se5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Rb(CuO5)2 by Materials Project

Rb(CuO5)2 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Rb is bonded in a 6-coordinate geometry to six O atoms. There are two shorter (2.81 Å) and four longer (3.04 Å) Rb–O bond lengths. Cu is bonded in a distorted square co-planar geometry to six O atoms. There are a spread of Cu–O bond distances ranging from 1.81–2.61 Å. There are four inequivalent O sites. In the first O site, O is bonded in a distorted single-bond geometry to one Rb, one Cu, and one O atom. The O–O bond length is 1.39 Å. In the second O site, O is bonded in a bent 120 degrees geometry to two equivalent O atoms. In the third O site, O is bonded in a distorted trigonal non-coplanar geometry to two equivalent Cu and one O atom. The O–O bond length is 1.25 Å. In the fourth O site, O is bonded in a distorted bent 120 degrees geometry to one Rb and two equivalent Cu atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on RbP2H5O8 by Materials Project

RbH5(PO4)2 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Rb1+ is bonded in a distorted square co-planar geometry to four O2- atoms. There are two shorter (3.03 Å) and two longer (3.04 Å) Rb–O bond lengths. P5+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of P–O bond distances ranging from 1.53–1.58 Å. There are three inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a linear geometry to two equivalent O2- atoms. Both H–O bond lengths are 1.20 Å. In the second H1+ site, H1+ is bonded in a linear geometry to two O2- atoms. There is one shorter (1.05 Å) and one longer (1.48 Å) H–O bond length. In the third H1+ site, H1+ is bonded in a distorted linear geometry to two O2- atoms. There is one shorter (1.02 Å) and one longer (1.63 Å) H–O bond length. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to one P5+ and two H1+ atoms. In the second O2- site, O2- is bonded in a bent 120 degrees geometry to one Rb1+, one P5+, and one H1+ atom. In the third O2- site, O2- is bonded in a bent 120 degrees geometry to one P5+ and one H1+ atom. In the fourth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Rb1+, one P5+, and one H1+ atom.

36 MATERIALS SCIENCE↗