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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Mg(BC)2 by Materials Project

MgB2C2 crystallizes in the orthorhombic Cmce space group. The structure is three-dimensional. there are two inequivalent Mg2+ sites. In the first Mg2+ site, Mg2+ is bonded in a distorted hexagonal planar geometry to six C4- atoms. There are a spread of Mg–C bond distances ranging from 2.43–2.50 Å. In the second Mg2+ site, Mg2+ is bonded in a 6-coordinate geometry to six C4- atoms. There are a spread of Mg–C bond distances ranging from 2.26–2.51 Å. There are three inequivalent B3+ sites. In the first B3+ site, B3+ is bonded in a trigonal planar geometry to three C4- atoms. There are a spread of B–C bond distances ranging from 1.56–1.60 Å. In the second B3+ site, B3+ is bonded in a trigonal planar geometry to three C4- atoms. All B–C bond lengths are 1.58 Å. In the third B3+ site, B3+ is bonded in a trigonal planar geometry to three C4- atoms. All B–C bond lengths are 1.59 Å. There are three inequivalent C4- sites. In the first C4- site, C4- is bonded in a distorted trigonal planar geometry to four Mg2+ and three B3+ atoms. In the second C4- site, C4- is bonded in a distorted trigonal planar geometry to three Mg2+ and three B3+ atoms. In the third C4- site, C4- is bonded in a distorted trigonal planar geometry to two equivalent Mg2+ and three B3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg2B24C by Materials Project

Mg2B24C crystallizes in the tetragonal P-4n2 space group. The structure is three-dimensional. there are two inequivalent Mg2+ sites. In the first Mg2+ site, Mg2+ is bonded in a 10-coordinate geometry to eight B and two equivalent C4- atoms. There are four shorter (2.27 Å) and four longer (2.31 Å) Mg–B bond lengths. Both Mg–C bond lengths are 2.54 Å. In the second Mg2+ site, Mg2+ is bonded in a 8-coordinate geometry to eight B atoms. There are four shorter (2.13 Å) and four longer (2.47 Å) Mg–B bond lengths. There are six inequivalent B sites. In the first B site, B is bonded in a 1-coordinate geometry to one Mg2+ and six B atoms. There are a spread of B–B bond distances ranging from 1.74–2.09 Å. In the second B site, B is bonded in a 7-coordinate geometry to one Mg2+ and six B atoms. There are a spread of B–B bond distances ranging from 1.76–1.91 Å. In the third B site, B is bonded in a distorted single-bond geometry to five B and one C4- atom. There are a spread of B–B bond distances ranging from 1.80–1.87 Å. The B–C bond length is 1.67 Å. In the fourth B site, B is bonded in a 6-coordinate geometry to six B atoms. There are a spread of B–B bond distances ranging from 1.69–1.80 Å. In the fifth B site, B is bonded in a 7-coordinate geometry to one Mg2+ and six B atoms. In the sixth B site, B is bonded in a 7-coordinate geometry to one Mg2+ and six B atoms. The B–B bond length is 1.96 Å. C4- is bonded in a 4-coordinate geometry to two equivalent Mg2+ and four equivalent B atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg(B6C)2 by Materials Project

B12C2Mg crystallizes in the orthorhombic Imma space group. The structure is zero-dimensional and consists of twenty-four boron, metallic molecules and four Mg(B3C)2 clusters. In each Mg(B3C)2 cluster, Mg2+ is bonded in a 2-coordinate geometry to two equivalent C4- atoms. Both Mg–C bond lengths are 2.29 Å. There are two inequivalent B+0.50+ sites. In the first B+0.50+ site, B+0.50+ is bonded in a single-bond geometry to one C4- atom. The B–C bond length is 1.66 Å. In the second B+0.50+ site, B+0.50+ is bonded in a single-bond geometry to one C4- atom. The B–C bond length is 1.65 Å. C4- is bonded in a 5-coordinate geometry to one Mg2+, three B+0.50+, and one C4- atom. The C–C bond length is 1.72 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg14BC by Materials Project

Mg14BC crystallizes in the orthorhombic Amm2 space group. The structure is three-dimensional. there are seven inequivalent Mg sites. In the first Mg site, Mg is bonded in a 8-coordinate geometry to eight Mg atoms. There are a spread of Mg–Mg bond distances ranging from 3.05–3.30 Å. In the second Mg site, Mg is bonded in a 8-coordinate geometry to eight Mg atoms. There are a spread of Mg–Mg bond distances ranging from 3.04–3.26 Å. In the third Mg site, Mg is bonded in an L-shaped geometry to two equivalent Mg, one B, and one C atom. Both Mg–Mg bond lengths are 2.87 Å. The Mg–B bond length is 2.36 Å. The Mg–C bond length is 2.25 Å. In the fourth Mg site, Mg is bonded in a 10-coordinate geometry to ten Mg atoms. There are a spread of Mg–Mg bond distances ranging from 3.00–3.35 Å. In the fifth Mg site, Mg is bonded in an L-shaped geometry to two equivalent Mg, one B, and one C atom. There are one shorter (3.16 Å) and one longer (3.40 Å) Mg–Mg bond lengths. The Mg–B bond length is 2.48 Å. The Mg–C bond length is 2.39 Å. In the sixth Mg site, Mg is bonded in a distorted single-bond geometry to five Mg and one B atom. Both Mg–Mg bond lengths are 3.31 Å. The Mg–B bond length is 2.75 Å. In the seventh Mg site, Mg is bonded in a 12-coordinate geometry to eleven Mg and one C atom. The Mg–C bond length is 2.85 Å. B is bonded in a 8-coordinate geometry to eight Mg atoms. C is bonded in a 6-coordinate geometry to eight Mg atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg(BC)2 by Materials Project

MgB2C2 crystallizes in the orthorhombic Pnnm space group. The structure is three-dimensional. Mg2+ is bonded in a 6-coordinate geometry to six equivalent C4- atoms. There are four shorter (2.34 Å) and two longer (2.42 Å) Mg–C bond lengths. B3+ is bonded in a trigonal planar geometry to three equivalent C4- atoms. There is one shorter (1.57 Å) and two longer (1.59 Å) B–C bond length. C4- is bonded in a distorted trigonal planar geometry to three equivalent Mg2+ and three equivalent B3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg6BC by Materials Project

Mg6BC crystallizes in the orthorhombic Amm2 space group. The structure is two-dimensional and consists of two Mg6BC sheets oriented in the (0, 1, 0) direction. there are four inequivalent Mg sites. In the first Mg site, Mg is bonded in a distorted bent 120 degrees geometry to one B and one C atom. The Mg–B bond length is 2.48 Å. The Mg–C bond length is 2.21 Å. In the second Mg site, Mg is bonded in an L-shaped geometry to two equivalent B atoms. Both Mg–B bond lengths are 2.83 Å. In the third Mg site, Mg is bonded in a water-like geometry to two equivalent B atoms. Both Mg–B bond lengths are 2.46 Å. In the fourth Mg site, Mg is bonded in a bent 120 degrees geometry to two equivalent C atoms. Both Mg–C bond lengths are 2.15 Å. B is bonded in a 8-coordinate geometry to eight Mg atoms. C is bonded in a 4-coordinate geometry to four Mg atoms.

36 MATERIALS SCIENCE↗