Lattice effect on thermal diffusivity in double perovskite molybdenum oxide investigated by mirage technique

Q.J. Huang; X.J. Liu; A.H. Luo; S.Y. Zhang; S. Xu

doi:doi:10.1051/jp4:2005125034

Numéro		J. Phys. IV France Volume 125, June 2005


Page(s)		149 - 151
DOI		https://doi.org/10.1051/jp4:2005125034

J. Phys. IV France 125 (2005) 149-151
DOI: 10.1051/jp4:2005125034

Lattice effect on thermal diffusivity in double perovskite molybdenum oxide investigated by mirage technique

Q.J. Huang¹, X.J. Liu^{1, 2}, A.H. Luo¹, S.Y. Zhang¹ and S. Xu²

¹ State Key Lab of Modern Acoustics and Institute of Acoustics, Nanjing University, Nanjing 210093, China
² Department of Crystalline Materials Science, Nagoya University, Nagoya 464-8601, Japan

Abstract
Lattice effect on the thermal diffusivity has been investigated in double perovskite A₂FeMoO₆ (A= Ca, Sr and Ba) by means of mirage technique at 300 K. We find that the thermal diffusivity increases form 35 mm²/s for A= Ca to 41 mm²/s for A= Ba. Considering the change of the Fe-O-Mo bond angle from 152.4 $^{\circ}$ for A= Ca to 180 $^{\circ}$ for A= Ba, the larger thermal diffusivity for Ba compound has been ascribed to the enhanced hybridization between transition-metal d and oxygen p states due to the larger Fe-O-Mo bond angle and hence the wider one-electron bandwidth (W).