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7 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Co2Ge by Materials Project

Co2Ge crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Co sites. In the first Co site, Co is bonded to six equivalent Co and five equivalent Ge atoms to form a mixture of distorted face and corner-sharing CoCo6Ge5 trigonal bipyramids. All Co–Co bond lengths are 2.63 Å. There are three shorter (2.31 Å) and two longer (2.51 Å) Co–Ge bond lengths. In the second Co site, Co is bonded in a 8-coordinate geometry to eight Co and six equivalent Ge atoms. Both Co–Co bond lengths are 2.51 Å. All Co–Ge bond lengths are 2.63 Å. Ge is bonded in a 11-coordinate geometry to eleven Co atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2018

Materials Data on Co2Ge by Materials Project

Co2Ge is Cotunnite structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Co sites. In the first Co site, Co is bonded in a 4-coordinate geometry to six equivalent Co and five equivalent Ge atoms. There are a spread of Co–Co bond distances ranging from 2.57–2.73 Å. There are a spread of Co–Ge bond distances ranging from 2.35–2.72 Å. In the second Co site, Co is bonded in a 5-coordinate geometry to eight Co and five equivalent Ge atoms. Both Co–Co bond lengths are 2.57 Å. There are a spread of Co–Ge bond distances ranging from 2.41–2.62 Å. Ge is bonded in a 10-coordinate geometry to ten Co atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Er(Co2Ge)2 by Materials Project

Er(Co2Ge)2 crystallizes in the tetragonal P4_2/mnm space group. The structure is three-dimensional. Er is bonded to six equivalent Ge atoms to form a mixture of distorted edge and corner-sharing ErGe6 octahedra. The corner-sharing octahedral tilt angles are 39°. There are two shorter (2.84 Å) and four longer (2.92 Å) Er–Ge bond lengths. Co is bonded in a 3-coordinate geometry to three equivalent Ge atoms. All Co–Ge bond lengths are 2.39 Å. Ge is bonded in a 9-coordinate geometry to three equivalent Er and six equivalent Co atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mn4Cr(Co2Ge)5 by Materials Project

CrMn4(Co2Ge)5 is Tungsten-derived structured and crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Cr is bonded in a distorted body-centered cubic geometry to eight Co and six equivalent Ge atoms. There are two shorter (2.47 Å) and six longer (2.48 Å) Cr–Co bond lengths. All Cr–Ge bond lengths are 2.86 Å. There are two inequivalent Mn sites. In the first Mn site, Mn is bonded in a distorted body-centered cubic geometry to eight Co and six Ge atoms. There are a spread of Mn–Co bond distances ranging from 2.46–2.49 Å. There are three shorter (2.86 Å) and three longer (2.88 Å) Mn–Ge bond lengths. In the second Mn site, Mn is bonded in a distorted body-centered cubic geometry to eight Co and six Ge atoms. There are two shorter (2.47 Å) and six longer (2.49 Å) Mn–Co bond lengths. All Mn–Ge bond lengths are 2.86 Å. There are nine inequivalent Co sites. In the first Co site, Co is bonded in a body-centered cubic geometry to three equivalent Cr, one Mn, and four equivalent Ge atoms. All Co–Cr bond lengths are 2.48 Å. The Co–Mn bond length is 2.49 Å. There are one shorter (2.44 Å) and three longer (2.49 Å) Co–Ge bond lengths. In the second Co site, Co is bonded in a body-centered cubic geometry to one Cr, three equivalent Mn, and four Ge atoms. There are one shorter (2.46 Å) and three longer (2.49 Å) Co–Ge bond lengths. In the third Co site, Co is bonded in a body-centered cubic geometry to four equivalent Mn and four Ge atoms. There are one shorter (2.46 Å) and three longer (2.49 Å) Co–Ge bond lengths. In the fourth Co site, Co is bonded in a body-centered cubic geometry to four Mn and four Ge atoms. There are one shorter (2.46 Å) and three longer (2.49 Å) Co–Ge bond lengths. In the fifth Co site, Co is bonded in a body-centered cubic geometry to three equivalent Cr, one Mn, and four equivalent Ge atoms. There are one shorter (2.44 Å) and three longer (2.49 Å) Co–Ge bond lengths. In the sixth Co site, Co is bonded in a body-centered cubic geometry to four Mn and four Ge atoms. There are one shorter (2.48 Å) and three longer (2.49 Å) Co–Ge bond lengths. In the seventh Co site, Co is bonded in a body-centered cubic geometry to three equivalent Cr, one Mn, and four equivalent Ge atoms. The Co–Mn bond length is 2.49 Å. There are one shorter (2.44 Å) and three longer (2.49 Å) Co–Ge bond lengths. In the eighth Co site, Co is bonded in a body-centered cubic geometry to four equivalent Mn and four Ge atoms. There are one shorter (2.46 Å) and three longer (2.49 Å) Co–Ge bond lengths. In the ninth Co site, Co is bonded in a body-centered cubic geometry to four equivalent Mn and four Ge atoms. There are one shorter (2.47 Å) and three longer (2.49 Å) Co–Mn bond lengths. There are one shorter (2.46 Å) and three longer (2.49 Å) Co–Ge bond lengths. There are three inequivalent Ge sites. In the first Ge site, Ge is bonded in a distorted body-centered cubic geometry to three equivalent Cr, three equivalent Mn, and eight Co atoms. In the second Ge site, Ge is bonded in a distorted body-centered cubic geometry to six equivalent Mn and eight Co atoms. In the third Ge site, Ge is bonded in a distorted body-centered cubic geometry to six Mn and eight Co atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Lu(Co2Ge)2 by Materials Project

Lu(Co2Ge)2 crystallizes in the tetragonal P4_2/mnm space group. The structure is three-dimensional. Lu is bonded to six equivalent Ge atoms to form a mixture of distorted corner and edge-sharing LuGe6 octahedra. The corner-sharing octahedral tilt angles are 39°. There are two shorter (2.83 Å) and four longer (2.92 Å) Lu–Ge bond lengths. Co is bonded in a 3-coordinate geometry to three equivalent Ge atoms. There are one shorter (2.38 Å) and two longer (2.39 Å) Co–Ge bond lengths. Ge is bonded in a 9-coordinate geometry to three equivalent Lu and six equivalent Co atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2019

Structure and Magnetism of Co2Ge Nanoparticles

The structural and magnetic properties of Co2Ge nanoparticles (NPs) prepared by the cluster-beam deposition (CBD) technique have been investigated. As-made particles with an average size of 5.5 nm exhibit a mixture of hexagonal and orthorhombic crystal structures. Thermomagnetic measurements showed that the as-made particles are superparamagnetic at room temperature with a blocking temperature (TB) of 20 K. When the particles are annealed at 823 K for 12 h, their size is increased to 13 nm and they develop a new orthorhombic crystal structure, with a Curie temperature (TC) of 815 K. This is drastically different from bulk, which are ferromagnetic at cryogenic temperatures only. X-ray diffraction (XRD) measurements suggest the formation of a new Co-rich orthorhombic phase (OP) with slightly increased c/a ratio in the annealed particles and this is believed to be the reason for the drastic change in their magnetic properties.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Yb(Co2Ge)2 by Materials Project

YbCo4Ge2 crystallizes in the tetragonal P4_2/mnm space group. The structure is three-dimensional. Yb is bonded to six equivalent Ge atoms to form a mixture of distorted corner and edge-sharing YbGe6 octahedra. The corner-sharing octahedral tilt angles are 39°. There are two shorter (2.86 Å) and four longer (2.94 Å) Yb–Ge bond lengths. Co is bonded in a 3-coordinate geometry to three equivalent Ge atoms. All Co–Ge bond lengths are 2.41 Å. Ge is bonded in a 9-coordinate geometry to three equivalent Yb and six equivalent Co atoms.

36 MATERIALS SCIENCE↗