J. Phys. IV France 125 (2005) 149-151
Lattice effect on thermal diffusivity in double perovskite molybdenum oxide investigated by mirage techniqueQ.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 for A= Ca to 180 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