SEARCH · Search NASA
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
CaW is Zintl Phase structured and crystallizes in the tetragonal I4_1/amd space group. The structure is three-dimensional and consists of two CaW frameworks. Ca is bonded to four equivalent W atoms to form distorted corner-sharing CaW4 tetrahedra. All Ca–W bond lengths are 2.99 Å. W is bonded to four equivalent Ca atoms to form distorted corner-sharing WCa4 tetrahedra.
CaW3 is alpha bismuth trifluoride structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Ca is bonded in a distorted body-centered cubic geometry to fourteen W atoms. There are eight shorter (2.85 Å) and six longer (3.29 Å) Ca–W bond lengths. There are two inequivalent W sites. In the first W site, W is bonded to four equivalent Ca and four equivalent W atoms to form a mixture of distorted face, edge, and corner-sharing WCa4W4 tetrahedra. All W–W bond lengths are 2.85 Å. In the second W site, W is bonded in a 8-coordinate geometry to six equivalent Ca and eight equivalent W atoms.
Ca3W crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Ca is bonded in a distorted see-saw-like geometry to four equivalent W atoms. There are two shorter (3.30 Å) and two longer (3.54 Å) Ca–W bond lengths. W is bonded to twelve equivalent Ca atoms to form a mixture of corner and face-sharing WCa12 cuboctahedra.