Abstract

CdVO 3− δ and solid solutions of Cd 1− x Na x VO 3 with the GdFeO 3-type perovskite structure were prepared using a high-pressure (6 GPa) and high-temperature technique. No significant oxygen and cation deficiency was found in CdVO 3. Cd 1− x Na x VO 3 are formed in the compositional range of 0 ⩽ x ⩽ 0.2 . CdVO 3 and Cd 1− x Na x VO 3 demonstrate metallic conductivity and Pauli paramagnetism between 2 and 300 K. A large electronic contribution to the specific heat ( γ = 13.4 and 11.2 mJ / ( mol K 2 ) for CdVO 3 and Cd 0.8Na 0.2VO 3, respectively) was observed at low temperatures due to the strongly correlated electrons. Crystal structures of CdVO 3 and Cd 0.8Na 0.2VO 3 were refined by X-ray powder diffraction: space group Pnma; Z = 4 ; a = 5.33435 ( 7 ) Å , b = 7.52320 ( 9 ) Å , and c = 5.26394 ( 6 ) Å for CdVO 3 and a = 5.32056 ( 9 ) Å , b = 7.50289 ( 13 ) Å , and c = 5.25902 ( 8 ) Å for Cd 0.8Na 0.2VO 3.

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