Thermal Diffusivity of Double Perovskite Sr2FeMoO6 and Sm Doping Effects Studied by Photo-Thermal Deflection Technique

摘要

Sr2-xSmxFeMoO6 polycrystalline structure sample which structure is tested by X-ray diffraction adopts solid-sintering method for preparation. Photo-thermal deflection technique is used to study the thermal diffusivity of the material ;then a diagra m of curves illustrates the relationship between proportion of different mixing and the thermal diffusivity of the material. Based on the increasing degree of concentration of mixing Sm, thermal diffusivity of the sample undulates with the structural changes of Sr2FeMoO6. Different from that in bibliography , the essential reasons are revealed from these aspects: phonon, electron, spin and their interaction;and the proper mixing proportion of structural conversion of the sample Sr2-xSmxFeMoO6 occurring at the range of 10% ～13% is suggested. It proves that photo-thermal deflection technique is effective and practical in researching the structure of double perovskites mixing with lanthanide and its effect of electron mixing.