High-pressure synthesis, crystal structures, and characterization of CdVO3-δ and solid solutions CdVO3-NaVO3

CdVO3-delta and solid solutions of Cd1-xNaxVO3 With the GdFeO3-type perovskite structure were prepared using a high-pressure (6 GPa) and high-temperature technique. No significant oxygen and cation deficiency was found in CdVO3. Cd1-xNaxVO3 are formed in the compositional range of 0 <= x <= 0.2. CdVO3 and Cd1-xNaxVO3 demonstrate metallic conductivity and Pauli paramagnetism between 2 and 300 K. A large electronic contribution to the specific heat (gamma = 13.4 and 11.2 mJ/(mol K-2) for CdVO3 and Cd0.8Na0.2VO3, respectively) was observed at low temperatures due to the strongly correlated electrons. Crystal structures of CdVO3 and Cd0.8Na0.2VO3 were refined by X-ray powder diffraction: space group Pnma; Z = 4; a = 5.33435(7) angstrom, b = 7.52320(9) angstrom, and c = 5.26394(6) angstrom for CdVO3 and a = 5.32056(9) angstrom, b = 7.50289(13) angstrom, and c = 5.25902(8) angstrom for Cd0.8Na0.2VO3. (c) 2006 Elsevier Inc. All rights reserved.