J. Phys. IV France
Volume 125, June 2005
Page(s) 149 - 151

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. Liu1, 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

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).

© EDP Sciences 2005