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At least 19 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Zr(CoGe)6 by Materials Project

Zr(CoGe)6 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Zr is bonded to twelve equivalent Co and eight Ge atoms to form distorted face-sharing ZrCo12Ge8 hexagonal bipyramids. All Zr–Co bond lengths are 3.20 Å. There are two shorter (2.64 Å) and six longer (2.93 Å) Zr–Ge bond lengths. Co is bonded in a 12-coordinate geometry to two equivalent Zr, four equivalent Co, and six Ge atoms. All Co–Co bond lengths are 2.54 Å. There are four shorter (2.43 Å) and two longer (2.63 Å) Co–Ge bond lengths. There are three inequivalent Ge sites. In the first Ge site, Ge is bonded in a 6-coordinate geometry to six equivalent Co atoms. In the second Ge site, Ge is bonded in a 8-coordinate geometry to one Zr, six equivalent Co, and one Ge atom. The Ge–Ge bond length is 2.49 Å. In the third Ge site, Ge is bonded in a 12-coordinate geometry to three equivalent Zr and six equivalent Co atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CoGe by Materials Project

CoGe crystallizes in the cubic P2_13 space group. The structure is three-dimensional. Co is bonded in a 7-coordinate geometry to seven equivalent Ge atoms. There are a spread of Co–Ge bond distances ranging from 2.38–2.61 Å. Ge is bonded in a 7-coordinate geometry to seven equivalent Co atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg(CoGe)6 by Materials Project

Mg(CoGe)6 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Mg is bonded in a 8-coordinate geometry to twelve equivalent Co and eight Ge atoms. All Mg–Co bond lengths are 3.19 Å. There are two shorter (2.60 Å) and six longer (2.93 Å) Mg–Ge bond lengths. Co is bonded in a 12-coordinate geometry to two equivalent Mg, four equivalent Co, and six Ge atoms. All Co–Co bond lengths are 2.54 Å. There are four shorter (2.42 Å) and two longer (2.62 Å) Co–Ge bond lengths. There are three inequivalent Ge sites. In the first Ge site, Ge is bonded in a 6-coordinate geometry to six equivalent Co atoms. In the second Ge site, Ge is bonded in a 12-coordinate geometry to three equivalent Mg and six equivalent Co atoms. In the third Ge site, Ge is bonded in a 8-coordinate geometry to one Mg, six equivalent Co, and one Ge atom. The Ge–Ge bond length is 2.51 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CoGe by Materials Project

CoGe is Modderite-like structured and crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are three inequivalent Co sites. In the first Co site, Co is bonded in a 6-coordinate geometry to four Co and six Ge atoms. There are two shorter (2.46 Å) and two longer (2.58 Å) Co–Co bond lengths. There are four shorter (2.40 Å) and two longer (2.46 Å) Co–Ge bond lengths. In the second Co site, Co is bonded in a 6-coordinate geometry to four Co and six Ge atoms. Both Co–Co bond lengths are 2.59 Å. There are four shorter (2.38 Å) and two longer (2.44 Å) Co–Ge bond lengths. In the third Co site, Co is bonded in a 6-coordinate geometry to two Co and six Ge atoms. There are a spread of Co–Ge bond distances ranging from 2.38–2.52 Å. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 6-coordinate geometry to six Co atoms. In the second Ge site, Ge is bonded in a 6-coordinate geometry to six Co atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Np(CoGe)2 by Materials Project

Np(CoGe)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Np is bonded in a 8-coordinate geometry to eight equivalent Co and eight equivalent Ge atoms. All Np–Co bond lengths are 3.15 Å. All Np–Ge bond lengths are 3.10 Å. Co is bonded to four equivalent Np and four equivalent Ge atoms to form a mixture of distorted corner, edge, and face-sharing CoNp4Ge4 tetrahedra. All Co–Ge bond lengths are 2.33 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Np, four equivalent Co, and one Ge atom. The Ge–Ge bond length is 2.47 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Li(CoGe)6 by Materials Project

Li(CoGe)6 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Li is bonded in a 8-coordinate geometry to twelve equivalent Co and eight Ge atoms. All Li–Co bond lengths are 3.17 Å. There are two shorter (2.54 Å) and six longer (2.92 Å) Li–Ge bond lengths. Co is bonded to two equivalent Li, four equivalent Co, and six Ge atoms to form a mixture of distorted face, edge, and corner-sharing CoLi2Co4Ge6 cuboctahedra. All Co–Co bond lengths are 2.53 Å. There are four shorter (2.41 Å) and two longer (2.60 Å) Co–Ge bond lengths. There are three inequivalent Ge sites. In the first Ge site, Ge is bonded in a 9-coordinate geometry to three equivalent Li and six equivalent Co atoms. In the second Ge site, Ge is bonded in a 6-coordinate geometry to six equivalent Co atoms. In the third Ge site, Ge is bonded in a distorted single-bond geometry to one Li, six equivalent Co, and one Ge atom. The Ge–Ge bond length is 2.58 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca(CoGe)2 by Materials Project

Ca(CoGe)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ca is bonded in a 8-coordinate geometry to eight equivalent Co and eight equivalent Ge atoms. All Ca–Co bond lengths are 3.27 Å. All Ca–Ge bond lengths are 3.13 Å. Co is bonded to four equivalent Ca and four equivalent Ge atoms to form a mixture of distorted corner, edge, and face-sharing CoCa4Ge4 tetrahedra. All Co–Ge bond lengths are 2.34 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Ca, four equivalent Co, and one Ge atom. The Ge–Ge bond length is 2.73 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pr(CoGe)2 by Materials Project

Pr(CoGe)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Pr is bonded in a 8-coordinate geometry to eight equivalent Co and eight equivalent Ge atoms. All Pr–Co bond lengths are 3.29 Å. All Pr–Ge bond lengths are 3.17 Å. Co is bonded to four equivalent Pr and four equivalent Ge atoms to form a mixture of distorted edge, face, and corner-sharing CoPr4Ge4 tetrahedra. All Co–Ge bond lengths are 2.36 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Pr, four equivalent Co, and one Ge atom. The Ge–Ge bond length is 2.76 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Yb(CoGe)2 by Materials Project

Yb(CoGe)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Yb is bonded in a 8-coordinate geometry to eight equivalent Co and eight equivalent Ge atoms. All Yb–Co bond lengths are 3.24 Å. All Yb–Ge bond lengths are 3.09 Å. Co is bonded to four equivalent Yb and four equivalent Ge atoms to form a mixture of distorted edge, corner, and face-sharing CoYb4Ge4 tetrahedra. All Co–Ge bond lengths are 2.33 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Yb, four equivalent Co, and one Ge atom. The Ge–Ge bond length is 2.66 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Lu(CoGe)2 by Materials Project

Lu(CoGe)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Lu is bonded in a 8-coordinate geometry to eight equivalent Co and eight equivalent Ge atoms. All Lu–Co bond lengths are 3.19 Å. All Lu–Ge bond lengths are 3.05 Å. Co is bonded to four equivalent Lu and four equivalent Ge atoms to form a mixture of distorted edge, face, and corner-sharing CoLu4Ge4 tetrahedra. All Co–Ge bond lengths are 2.32 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Lu, four equivalent Co, and one Ge atom. The Ge–Ge bond length is 2.53 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sr(CoGe)2 by Materials Project

Sr(CoGe)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Sr is bonded in a 8-coordinate geometry to eight equivalent Co and eight equivalent Ge atoms. All Sr–Co bond lengths are 3.41 Å. All Sr–Ge bond lengths are 3.25 Å. Co is bonded to four equivalent Sr and four equivalent Ge atoms to form a mixture of distorted edge, corner, and face-sharing CoSr4Ge4 tetrahedra. All Co–Ge bond lengths are 2.35 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Sr and four equivalent Co atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba(CoGe)2 by Materials Project

Ba(CoGe)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ba is bonded in a distorted body-centered cubic geometry to eight equivalent Ge atoms. All Ba–Ge bond lengths are 3.42 Å. Co is bonded to four equivalent Ge atoms to form a mixture of distorted corner and edge-sharing CoGe4 tetrahedra. All Co–Ge bond lengths are 2.34 Å. Ge is bonded in a 8-coordinate geometry to four equivalent Ba and four equivalent Co atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2022

Possible quadrupole-order-driven commensurate-incommensurate phase transition in B20 CoGe

For this study, the B20-type cobalt germanide CoGe was investigated by measuring the specific heat, resistivity, and 59 Co nuclear magnetic resonance (NMR). We observed a phase transition at T Q = 13.7 K, evidenced by a very narrow peak of the specific heat and sharp changes of the nuclear spin-spin (T 2 –1 ) and spin-lattice ( T 1 – 1 ) relaxation rates. The fact that the entropy release is extremely small and the Knight shift is almost independent of temperature down to low temperatures as anticipated in a paramagnetic metal indicates that the T Q transition is of nonmagnetic origin. In addition, we detected a crossover scale T 0 ~ 30 K below which the resistivity and the NMR linewidth increase, and T 1 –1 is progressively distributed in space, that is, a static and dynamical spatial inhomogeneity develops. While the order parameter for the T Q transition remains an open question, a group-theoretical analysis suggests that the finite electric quadrupole density arising from the low local site symmetry at cobalt sites could drive the crystal symmetry lowering from the P2 1 3 symmetry that is commensurate to the R3 symmetry with an incommensurate wave vector, which fairly well accounts for the T Q transition. The quadrupole-order-driven commensurate-incommensurate phase transition may be another remarkable phenomenon arising from the structural chirality inherent in the noncentrosymmetric B20 family.

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗
DOE OSTI2020

Materials Data on Dy(CoGe)2 by Materials Project

DyCo2Ge2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Dy is bonded in a 8-coordinate geometry to eight equivalent Co and eight equivalent Ge atoms. All Dy–Co bond lengths are 3.22 Å. All Dy–Ge bond lengths are 3.09 Å. Co is bonded to four equivalent Dy and four equivalent Ge atoms to form a mixture of distorted edge, face, and corner-sharing CoDy4Ge4 tetrahedra. All Co–Ge bond lengths are 2.34 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Dy, four equivalent Co, and one Ge atom. The Ge–Ge bond length is 2.59 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on La(CoGe)2 by Materials Project

LaCo2Ge2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. La is bonded in a 8-coordinate geometry to eight equivalent Co and eight equivalent Ge atoms. All La–Co bond lengths are 3.28 Å. All La–Ge bond lengths are 3.23 Å. Co is bonded in a 4-coordinate geometry to four equivalent La and four equivalent Ge atoms. All Co–Ge bond lengths are 2.36 Å. Ge is bonded in a 9-coordinate geometry to four equivalent La, four equivalent Co, and one Ge atom. The Ge–Ge bond length is 2.80 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on U(CoGe)2 by Materials Project

UCo2Ge2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. U is bonded in a 8-coordinate geometry to eight equivalent Co and eight equivalent Ge atoms. All U–Co bond lengths are 3.13 Å. All U–Ge bond lengths are 3.11 Å. Co is bonded in a 4-coordinate geometry to four equivalent U and four equivalent Ge atoms. All Co–Ge bond lengths are 2.33 Å. Ge is bonded in a 9-coordinate geometry to four equivalent U, four equivalent Co, and one Ge atom. The Ge–Ge bond length is 2.46 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ce(CoGe)2 by Materials Project

CeCo2Ge2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ce is bonded in a 8-coordinate geometry to eight equivalent Co and eight equivalent Ge atoms. All Ce–Co bond lengths are 3.21 Å. All Ce–Ge bond lengths are 3.17 Å. Co is bonded in a 4-coordinate geometry to four equivalent Ce and four equivalent Ge atoms. All Co–Ge bond lengths are 2.35 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Ce, four equivalent Co, and one Ge atom. The Ge–Ge bond length is 2.63 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Th(CoGe)2 by Materials Project

ThCo2Ge2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Th is bonded in a 8-coordinate geometry to eight equivalent Co and eight equivalent Ge atoms. All Th–Co bond lengths are 3.21 Å. All Th–Ge bond lengths are 3.22 Å. Co is bonded in a 4-coordinate geometry to four equivalent Th and four equivalent Ge atoms. All Co–Ge bond lengths are 2.37 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Th, four equivalent Co, and one Ge atom. The Ge–Ge bond length is 2.63 Å.

36 MATERIALS SCIENCE↗