Abstract
The temperature-composition phase diagram of with is found to contain four phases: rutile (), normal monoclinic V (), and two monoclinic phases ( and ). For with at 298 °K, , , Å, and . The and regions are separated by a volume discontinuity. There are two types of V atoms in these structures. The first type form pairs and the second type form zig-zag chains along the axis. This contrasts with V where all the vanadium atoms are paired. The structures , , and with have been refined from single-crystal x-ray data. High-pressure resistivity and x-ray measurements vs temperature give °K/kbar and /mole V. At higher pressures °K/kbar. These results cannot be simply interpreted in terms of the homopolar bond model proposed for the phase of V.
- Received 8 September 1971
DOI:https://doi.org/10.1103/PhysRevB.5.2541
©1972 American Physical Society