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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Ca(CO2)2 by Materials Project

CaC2O4 crystallizes in the orthorhombic Pbca space group. The structure is three-dimensional. Ca2+ is bonded to seven O2- atoms to form distorted edge-sharing CaO7 pentagonal bipyramids. There are a spread of Ca–O bond distances ranging from 2.32–2.70 Å. There are two inequivalent C3+ sites. In the first C3+ site, C3+ is bonded in a bent 120 degrees geometry to two O2- atoms. Both C–O bond lengths are 1.25 Å. In the second C3+ site, C3+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.24 Å) and one longer (1.26 Å) C–O bond length. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Ca2+ and one C3+ atom. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Ca2+ and one C3+ atom. In the third O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Ca2+ and one C3+ atom. In the fourth O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Ca2+ and one C3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca(CO2)2 by Materials Project

CaC2O4 crystallizes in the monoclinic P2/m space group. The structure is three-dimensional. there are two inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded to seven O2- atoms to form distorted edge-sharing CaO7 pentagonal bipyramids. There are a spread of Ca–O bond distances ranging from 2.36–2.50 Å. In the second Ca2+ site, Ca2+ is bonded to seven O2- atoms to form distorted edge-sharing CaO7 pentagonal bipyramids. There are a spread of Ca–O bond distances ranging from 2.35–2.49 Å. There are four inequivalent C3+ sites. In the first C3+ site, C3+ is bonded in a bent 120 degrees geometry to two equivalent O2- atoms. Both C–O bond lengths are 1.27 Å. In the second C3+ site, C3+ is bonded in a bent 120 degrees geometry to two equivalent O2- atoms. Both C–O bond lengths are 1.27 Å. In the third C3+ site, C3+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.26 Å) and one longer (1.28 Å) C–O bond length. In the fourth C3+ site, C3+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.26 Å) and one longer (1.28 Å) C–O bond length. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one C3+ atom. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one C3+ atom. In the third O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Ca2+ and one C3+ atom. In the fourth O2- site, O2- is bonded in a bent 120 degrees geometry to one Ca2+ and one C3+ atom. In the fifth O2- site, O2- is bonded in a bent 120 degrees geometry to one Ca2+ and one C3+ atom. In the sixth O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Ca2+ and one C3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca(CO2)2 by Materials Project

CaC2O4 crystallizes in the monoclinic P2/m space group. The structure is two-dimensional and consists of one CaC2O4 sheet oriented in the (1, 0, 0) direction. there are two inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Ca–O bond distances ranging from 2.23–2.56 Å. In the second Ca2+ site, Ca2+ is bonded in a 6-coordinate geometry to seven O2- atoms. There are a spread of Ca–O bond distances ranging from 2.29–3.04 Å. There are four inequivalent C3+ sites. In the first C3+ site, C3+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.26 Å) and one longer (1.27 Å) C–O bond length. In the second C3+ site, C3+ is bonded in a bent 120 degrees geometry to two equivalent O2- atoms. Both C–O bond lengths are 1.27 Å. In the third C3+ site, C3+ is bonded in a bent 120 degrees geometry to two equivalent O2- atoms. Both C–O bond lengths are 1.27 Å. In the fourth C3+ site, C3+ is bonded in a single-bond geometry to one O2- atom. The C–O bond length is 1.33 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to one Ca2+ and one C3+ atom. In the second O2- site, O2- is bonded in a 3-coordinate geometry to two Ca2+ and one C3+ atom. In the third O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Ca2+ and one C3+ atom. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to two Ca2+ and one C3+ atom. In the fifth O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Ca2+, one C3+, and one O2- atom. The O–O bond length is 1.45 Å. In the sixth O2- site, O2- is bonded in a distorted L-shaped geometry to one Ca2+ and one O2- atom.

36 MATERIALS SCIENCE↗
DOE OSTI2026

Microwave-Assisted Hydrogen Generation from Hydrocarbon-Bearing Reservoir Rocks: Stage-Dependent Thermal Runaway and In-Situ Carbonate Engineering

Microwave-assisted hydrogen generation from hydrocarbon-bearing reservoir rocks is strongly influenced by mineralogy, methane activation, carbonate reactions, and thermal runaway behavior. This study investigates a new approach in which carbonate phases are generated in-situ through the reaction of internally produced CO2 with Ca(OH)2 under microwave heating conditions. The objective is to evaluate how rock mineralogy, methane injection, and Ca(OH)2 addition influence hydrogen generation, carbon redistribution, and stage-dependent reaction pathways during microwave exposure. Microwave heating experiments were conducted using Permian Basin reservoir rocks under three experimental conditions: rock-only experiments under Ar atmosphere, CH4–Ar experiments without additive, and CH4–Ar experiments containing 5 wt% Ca(OH)2. Methane-assisted experiments were performed under continuous injection of 30 standard cubic centimeters per minute (sccm) CH4 and 30 sccm Ar. Based on thermal runaway behavior, each experiment was divided into three operational stages: Before Thermal Runaway (BR), After Thermal Runaway–Decrease in Microwave Power (ARD), and After Thermal Runaway– Increase in Microwave Power (ARI). Temperature and gas composition were continuously monitored throughout the experiments. The rock-only experiments demonstrated that hydrogen generation can occur intrinsically from hydrocarbon-bearing rocks under microwave heating, even without externally injected methane. However, hydrogen production did not correlate solely with kerogen content, indicating that mineralogy strongly influences hydrogen-generation pathways. Correlation analyses suggested that kerogen decomposition initially generated CH4, CO, and CO2, followed by secondary hydrocarbon reactions associated with H2 and C2 hydrocarbon formation. Methane-assisted experiments substantially increased hydrogen production; however, identical methane injection rates produced significantly different hydrogen yields among the rock samples, confirming that mineralogical composition controls methaneconversion behavior under microwave heating conditions. The addition of Ca(OH)2 significantly altered carbon evolution behavior in a stage-dependent manner. During the BR stage, Ca(OH)2 reduced gas-phase CO2 production, particularly in carbonate-rich rocks, indicating favorable conditions for in-situ carbonation and carbonate deposition prior to extensive thermal decomposition. The suppression of CO2 during BR became more pronounced with increasing carbonate content of the rock system. After thermal runaway, carbonate-containing systems exhibited enhanced hydrogen generation behavior, suggesting that carbonatederived mineral transformations and carbonate-mediated reactions contribute to high-temperature hydrogen-generation pathways. In carbonate-poor rocks, Ca(OH)2 addition enabled simultaneous URTeC 4493775 2 enhancement of hydrogen production and partial suppression of CO2 release during the post-runaway stages. Overall, the results demonstrate that microwave-assisted hydrogen generation is governed by dynamically evolving interactions among kerogen decomposition, methane activation, mineral transformations, carbonate formation/decomposition, and thermal runaway behavior. This work introduces in-situ carbonate engineering with Ca(OH)2 as a strategy for coupling hydrogen generation with partial insitu carbon management under microwave heating conditions.

03 NATURAL GAS↗
DOE OSTI2020

Materials Data on CaH2(CO2)2 by Materials Project

CaH2(CO2)2 crystallizes in the tetragonal P4_32_12 space group. The structure is three-dimensional. Ca2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ca–O bond distances ranging from 2.33–2.52 Å. C2+ is bonded in a trigonal planar geometry to one H1+ and two O2- atoms. The C–H bond length is 1.11 Å. There is one shorter (1.26 Å) and one longer (1.27 Å) C–O bond length. H1+ is bonded in a single-bond geometry to one C2+ atom. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to one Ca2+ and one C2+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Ca2+ and one C2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaH2(CO2)2 by Materials Project

CaH2(CO2)2 crystallizes in the orthorhombic Pbca space group. The structure is three-dimensional. Ca2+ is bonded to seven O2- atoms to form distorted edge-sharing CaO7 pentagonal bipyramids. There are a spread of Ca–O bond distances ranging from 2.34–2.58 Å. There are two inequivalent C2+ sites. In the first C2+ site, C2+ is bonded in a trigonal planar geometry to one H1+ and two O2- atoms. The C–H bond length is 1.11 Å. Both C–O bond lengths are 1.27 Å. In the second C2+ site, C2+ is bonded in a trigonal planar geometry to one H1+ and two O2- atoms. The C–H bond length is 1.11 Å. There is one shorter (1.26 Å) and one longer (1.28 Å) C–O bond length. There are two inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one C2+ atom. In the second H1+ site, H1+ is bonded in a single-bond geometry to one C2+ atom. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Ca2+ and one C2+ atom. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Ca2+ and one C2+ atom. In the third O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Ca2+ and one C2+ atom. In the fourth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Ca2+ and one C2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaH2(CO2)2 by Materials Project

CaH2(CO2)2 crystallizes in the tetragonal P4_12_12 space group. The structure is three-dimensional. Ca2+ is bonded to six O2- atoms to form distorted corner-sharing CaO6 octahedra. The corner-sharing octahedral tilt angles are 61°. There are a spread of Ca–O bond distances ranging from 2.33–2.52 Å. C2+ is bonded in a trigonal planar geometry to one H1+ and two O2- atoms. The C–H bond length is 1.11 Å. There is one shorter (1.26 Å) and one longer (1.27 Å) C–O bond length. H1+ is bonded in a single-bond geometry to one C2+ atom. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted linear geometry to one Ca2+ and one C2+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Ca2+ and one C2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca(CoN)2 by Materials Project

Ca(CoN)2 crystallizes in the tetragonal P-4m2 space group. The structure is two-dimensional and consists of one Ca(CoN)2 sheet oriented in the (0, 0, 1) direction. Ca2+ is bonded to four equivalent N3- atoms to form distorted corner-sharing CaN4 tetrahedra. All Ca–N bond lengths are 2.43 Å. Co2+ is bonded in a linear geometry to two equivalent N3- atoms. Both Co–N bond lengths are 1.73 Å. N3- is bonded in a rectangular see-saw-like geometry to two equivalent Ca2+ and two equivalent Co2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaCo(SiO3)2 by Materials Project

CaCoSi2O6 is Esseneite structured and crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.34–2.79 Å. Co2+ is bonded to six O2- atoms to form CoO6 octahedra that share corners with six equivalent SiO4 tetrahedra and edges with two equivalent CoO6 octahedra. There are a spread of Co–O bond distances ranging from 2.09–2.18 Å. Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with three equivalent CoO6 octahedra and corners with two equivalent SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 35–58°. There are a spread of Si–O bond distances ranging from 1.61–1.70 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Ca2+ and two equivalent Si4+ atoms. In the second O2- site, O2- is bonded in a distorted T-shaped geometry to one Ca2+, one Co2+, and one Si4+ atom. In the third O2- site, O2- is bonded in a 4-coordinate geometry to one Ca2+, two equivalent Co2+, and one Si4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaCo2(PO4)2 by Materials Project

CaCo2(PO4)2 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are four inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.30–2.80 Å. In the second Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.29–2.79 Å. In the third Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.29–2.79 Å. In the fourth Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.30–2.81 Å. There are eight inequivalent Co2+ sites. In the first Co2+ site, Co2+ is bonded to five O2- atoms to form distorted CoO5 trigonal bipyramids that share corners with five PO4 tetrahedra. There are a spread of Co–O bond distances ranging from 2.00–2.15 Å. In the second Co2+ site, Co2+ is bonded to five O2- atoms to form distorted CoO5 trigonal bipyramids that share corners with five PO4 tetrahedra. There are a spread of Co–O bond distances ranging from 1.99–2.13 Å. In the third Co2+ site, Co2+ is bonded to five O2- atoms to form distorted CoO5 trigonal bipyramids that share corners with five PO4 tetrahedra. There are a spread of Co–O bond distances ranging from 2.00–2.15 Å. In the fourth Co2+ site, Co2+ is bonded in a distorted square co-planar geometry to six O2- atoms. There are a spread of Co–O bond distances ranging from 2.02–2.70 Å. In the fifth Co2+ site, Co2+ is bonded to five O2- atoms to form distorted CoO5 trigonal bipyramids that share corners with five PO4 tetrahedra. There are a spread of Co–O bond distances ranging from 1.99–2.15 Å. In the sixth Co2+ site, Co2+ is bonded in a 4-coordinate geometry to six O2- atoms. There are a spread of Co–O bond distances ranging from 2.01–2.65 Å. In the seventh Co2+ site, Co2+ is bonded in a 4-coordinate geometry to six O2- atoms. There are a spread of Co–O bond distances ranging from 2.01–2.64 Å. In the eighth Co2+ site, Co2+ is bonded in a distorted square co-planar geometry to six O2- atoms. There are a spread of Co–O bond distances ranging from 2.02–2.69 Å. There are eight inequivalent P5+ sites. In the first P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two CoO5 trigonal bipyramids. There are a spread of P–O bond distances ranging from 1.52–1.57 Å. In the second P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with three CoO5 trigonal bipyramids. There are a spread of P–O bond distances ranging from 1.54–1.57 Å. In the third P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two CoO5 trigonal bipyramids. There are a spread of P–O bond distances ranging from 1.52–1.57 Å. In the fourth P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with three CoO5 trigonal bipyramids. There are a spread of P–O bond distances ranging from 1.54–1.57 Å. In the fifth P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two CoO5 trigonal bipyramids. There are a spread of P–O bond distances ranging from 1.52–1.58 Å. In the sixth P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two CoO5 trigonal bipyramids. There are a spread of P–O bond distances ranging from 1.52–1.58 Å. In the seventh P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with three CoO5 trigonal bipyramids. There are a spread of P–O bond distances ranging from 1.54–1.57 Å. In the eighth P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with three CoO5 trigonal bipyramids. There are a spread of P–O bond distances ranging from 1.54–1.57 Å. There are thirty-two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ca2+, one Co2+, and one P5+ atom. In the second O2- site, O2- is bonded in a 3-coordinate geometry to one Ca2+, one Co2+, and one P5+ atom. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ca2+, one Co2+, and one P5+ atom. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to one Ca2+, two Co2+, and one P5+ atom. In the fifth O2- site, O2- is bonded in a 4-coordinate geometry to one Ca2+, two Co2+, and one P5+ atom. In the sixth O2- site, O2- is bonded in a 2-coordinate geometry to one Ca2+, one Co2+, and one P5+ atom. In the seventh O2- site, O2- is bonded in a 2-coordinate geometry to one Ca2+, two Co2+, and one P5+ atom. In the eighth O2- site, O2- is bonded in a 3-coordinate geometry to one Ca2+, two Co2+, and one P5+ atom. In the ninth O2- site, O2- is bonded in a 2-coordinate geometry to one Ca2+, two Co2+, and one P5+ atom. In the tenth O2- site, O2- is bonded in a 3-coordinate geometry to one Ca2+, one Co2+, and one P5+ atom. In the eleventh O2- site, O2- is bonded in a distorted trigonal planar geometry to two Co2+ and one P5+ atom. In the twelfth O2- site, O2- is bonded in a 3-coordinate geometry to two Ca2+ and one P5+ atom. In the thirteenth O2- site, O2- is bonded in a 3-coordinate geometry to one Ca2+, one Co2+, and one P5+ atom. In the fourteenth O2- site, O2- is bonded in a 3-coordinate geometry to one Ca2+, two Co2+, and one P5+ atom. In the fifteenth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ca2+, one Co2+, and one P5+ atom. In the sixteenth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Co2+ and one P5+ atom. In the seventeenth O2- site, O2- is bonded in a 3-coordinate geometry to two Ca2+ and one P5+ atom. In the eighteenth O2- site, O2- is bonded in a 2-coordinate geometry to one Ca2+, two Co2+, and one P5+ atom. In the nineteenth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Co2+ and one P5+ atom. In the twentieth O2- site, O2- is bonded in a 3-coordinate geometry to two Ca2+ and one P5+ atom. In the twenty-first O2- site, O2- is bonded in a 3-coordinate geometry to one Ca2+, two Co2+, and one P5+ atom. In the twenty-second O2- site, O2- is bonded in a 4-coordinate geometry to one Ca2+, two Co2+, and one P5+ atom. In the twenty-third O2- site, O2- is bonded in a 3-coordinate geometry to one Ca2+, two Co2+, and one P5+ atom. In the twenty-fourth O2- site, O2- is bonded in a 2-coordinate geometry to one Ca2+, one Co2+, and one P5+ atom. In the twenty-fifth O2- site, O2- is bonded in a 3-coordinate geometry to one Ca2+, one Co2+, and one P5+ atom. In the twenty-sixth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ca2+, one Co2+, and one P5+ atom. In the twenty-seventh O2- site, O2- is bonded in a 3-coordinate geometry to two Ca2+ and one P5+ atom. In the twenty-eighth O2- site, O2- is bonded in a 4-coordinate geometry to one Ca2+, two Co2+, and one P5+ atom. In the twenty-ninth O2- site, O2- is bonded in a 4-coordinate geometry to one Ca2+, two Co2+, and one P5+ atom. In the thirtieth O2- site, O2- is bonded in a 2-coordinate geometry to one Ca2+, one Co2+, and one P5+ atom. In the thirty-first O2- site, O2- is bonded in a 2-coordinate geometry to one Ca2+, one Co2+, and one P5+ atom. In the thirty-second O2- site, O2- is bonded in a distorted trigonal planar geometry to two Co2+ and one P5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca3V3(CoO6)2 by Materials Project

Ca3V3(CoO6)2 crystallizes in the cubic Ia-3d space group. The structure is three-dimensional. Ca2+ is bonded in a distorted body-centered cubic geometry to eight equivalent O2- atoms. There are four shorter (2.44 Å) and four longer (2.55 Å) Ca–O bond lengths. V+4.67+ is bonded to four equivalent O2- atoms to form VO4 tetrahedra that share corners with four equivalent CoO6 octahedra. The corner-sharing octahedral tilt angles are 50°. All V–O bond lengths are 1.76 Å. Co2+ is bonded to six equivalent O2- atoms to form CoO6 octahedra that share corners with six equivalent VO4 tetrahedra. All Co–O bond lengths are 2.12 Å. O2- is bonded in a 4-coordinate geometry to two equivalent Ca2+, one V+4.67+, and one Co2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca(CoP)2 by Materials Project

CaCo2P2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ca2+ is bonded in a distorted body-centered cubic geometry to eight equivalent P3- atoms. All Ca–P bond lengths are 3.00 Å. Co2+ is bonded to four equivalent P3- atoms to form a mixture of corner and edge-sharing CoP4 tetrahedra. All Co–P bond lengths are 2.24 Å. P3- is bonded in a 9-coordinate geometry to four equivalent Ca2+, four equivalent Co2+, and one P3- atom. The P–P bond length is 2.51 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca(CoAs)2 by Materials Project

Ca(CoAs)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ca2+ is bonded in a body-centered cubic geometry to eight equivalent As3- atoms. All Ca–As bond lengths are 3.16 Å. Co2+ is bonded to four equivalent As3- atoms to form a mixture of edge and corner-sharing CoAs4 tetrahedra. All Co–As bond lengths are 2.33 Å. As3- is bonded in a 9-coordinate geometry to four equivalent Ca2+, four equivalent Co2+, and one As3- atom. The As–As bond length is 2.80 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba2CaV2CoF14 by Materials Project

Ba2CaV2CoF14 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Ba2+ is bonded in a 12-coordinate geometry to twelve F1- atoms. There are a spread of Ba–F bond distances ranging from 2.67–3.29 Å. Ca2+ is bonded in a 8-coordinate geometry to eight F1- atoms. There are a spread of Ca–F bond distances ranging from 2.25–2.62 Å. V3+ is bonded to six F1- atoms to form VF6 octahedra that share corners with two equivalent CoF6 octahedra. The corner-sharing octahedra tilt angles range from 49–53°. There are a spread of V–F bond distances ranging from 1.93–2.03 Å. Co2+ is bonded to six F1- atoms to form CoF6 octahedra that share corners with four equivalent VF6 octahedra. The corner-sharing octahedra tilt angles range from 49–53°. There are a spread of Co–F bond distances ranging from 2.02–2.17 Å. There are seven inequivalent F1- sites. In the first F1- site, F1- is bonded in a 2-coordinate geometry to two equivalent Ba2+, one Ca2+, and one V3+ atom. In the second F1- site, F1- is bonded in a distorted bent 120 degrees geometry to two equivalent Ba2+, one V3+, and one Co2+ atom. In the third F1- site, F1- is bonded in a 3-coordinate geometry to one Ba2+, one Ca2+, and one V3+ atom. In the fourth F1- site, F1- is bonded in a distorted single-bond geometry to three equivalent Ba2+ and one V3+ atom. In the fifth F1- site, F1- is bonded in a distorted trigonal planar geometry to one Ba2+, one Ca2+, and one Co2+ atom. In the sixth F1- site, F1- is bonded in a 1-coordinate geometry to two equivalent Ba2+, one Ca2+, and one V3+ atom. In the seventh F1- site, F1- is bonded in a 2-coordinate geometry to one Ba2+, one V3+, and one Co2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba2CaFe2CoF14 by Materials Project

Ba2CaFe2CoF14 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Ba2+ is bonded in a 12-coordinate geometry to twelve F1- atoms. There are a spread of Ba–F bond distances ranging from 2.69–3.27 Å. Ca2+ is bonded in a 8-coordinate geometry to eight F1- atoms. There are a spread of Ca–F bond distances ranging from 2.27–2.61 Å. Fe3+ is bonded to six F1- atoms to form FeF6 octahedra that share corners with two equivalent CoF6 octahedra. The corner-sharing octahedra tilt angles range from 49–55°. There are a spread of Fe–F bond distances ranging from 1.93–2.00 Å. Co2+ is bonded to six F1- atoms to form CoF6 octahedra that share corners with four equivalent FeF6 octahedra. The corner-sharing octahedra tilt angles range from 49–55°. There are a spread of Co–F bond distances ranging from 1.99–2.20 Å. There are seven inequivalent F1- sites. In the first F1- site, F1- is bonded in a distorted single-bond geometry to three equivalent Ba2+ and one Fe3+ atom. In the second F1- site, F1- is bonded in a 3-coordinate geometry to one Ba2+, one Ca2+, and one Co2+ atom. In the third F1- site, F1- is bonded in a 3-coordinate geometry to one Ba2+, one Ca2+, and one Fe3+ atom. In the fourth F1- site, F1- is bonded in a 1-coordinate geometry to two equivalent Ba2+, one Ca2+, and one Fe3+ atom. In the fifth F1- site, F1- is bonded in a 2-coordinate geometry to two equivalent Ba2+, one Fe3+, and one Co2+ atom. In the sixth F1- site, F1- is bonded in a distorted bent 120 degrees geometry to two equivalent Ba2+, one Ca2+, and one Fe3+ atom. In the seventh F1- site, F1- is bonded in a 2-coordinate geometry to one Ba2+, one Fe3+, and one Co2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca4ZnCo(Si2O7)2 by Materials Project

Ca4CoZn(Si2O7)2 crystallizes in the tetragonal P-4 space group. The structure is three-dimensional. Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.40–2.74 Å. Co2+ is bonded to four equivalent O2- atoms to form CoO4 tetrahedra that share corners with four equivalent SiO4 tetrahedra. All Co–O bond lengths are 1.95 Å. Zn2+ is bonded to four equivalent O2- atoms to form ZnO4 tetrahedra that share corners with four equivalent SiO4 tetrahedra. All Zn–O bond lengths are 1.95 Å. Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share a cornercorner with one CoO4 tetrahedra, a cornercorner with one ZnO4 tetrahedra, and a cornercorner with one SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.62–1.69 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Ca2+ and two equivalent Si4+ atoms. In the second O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Ca2+, one Zn2+, and one Si4+ atom. In the third O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Ca2+, one Co2+, and one Si4+ atom. In the fourth O2- site, O2- is bonded in a 1-coordinate geometry to three equivalent Ca2+ and one Si4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca2CoC(NO)2 by Materials Project

Ca2CoC(NO)2 crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. Ca2+ is bonded in a 8-coordinate geometry to four equivalent N3- and four equivalent O2- atoms. All Ca–N bond lengths are 2.82 Å. All Ca–O bond lengths are 2.47 Å. Co2+ is bonded in a square co-planar geometry to four equivalent O2- atoms. All Co–O bond lengths are 1.83 Å. C4+ is bonded in a linear geometry to two equivalent N3- atoms. Both C–N bond lengths are 1.25 Å. N3- is bonded in a distorted single-bond geometry to four equivalent Ca2+ and one C4+ atom. O2- is bonded to four equivalent Ca2+ and two equivalent Co2+ atoms to form a mixture of distorted corner, edge, and face-sharing OCa4Co2 octahedra. The corner-sharing octahedral tilt angles are 0°.

36 MATERIALS SCIENCE↗