Low thermal expansion over a wide temperature range of Zr1-xFexV2-xMoxO7 (0 ≤ x ≤ 0.9).

A novel Zr 1- x Fe x V 2- x Mo x O 7 (0 ≤ x ≤ 0.9) material is developed and the effect substitutions of Fe 3+ /Mo 6+ for Zr 4+ /V 5+ in ZrV 2 O 7 on the thermal expansion property are investigated. For the smaller x value ( x ≤ 0.5), their crystal structures remain cubic. The one of x = 0.5 is much higher than recent reports about uni-substitution of P 5+ for V 5+ and dual-substitution of Cu 2+ /P 5+ for Zr 4+ /V 5+ . For a substitution more than 0.5, crystal lattice appears distorted and 3 × 3 × 3 superstructure disappears gradually. For the substitution of x = 0.9, low thermal expansion is obtained from 140 to 700 K, which holds great potential applications in low temperature field. The mechanism of low thermal expansion of Zr 1- x Fe x V 2- x Mo x O 7 (0 ≤ x ≤ 0.9) is discussed around the distortion of crystal structure due to the substitutions of Fe 3+ /Mo 6+ for Zr 4+ /V 5+ in ZrV 2 O 7 . [ABSTRACT FROM AUTHOR]