光热偏转技术测量Sr_(2-x)Sm_xFeMoO_6材料的热扩散率

Measuring the thermal-diffusivity of Sr_(2-x)Sm_xFeMoO_6 using photo-thermal deflection technique

采用固体烧结法制备了Sr2-xSmxFeMoO6(x=0,0.03,0.05,0.08,0.10,0.13,0.15,0.20)多晶结构样品,用X射线衍射对材料的结构进行了检测。通过光热偏转技术方法对该材料的热扩散率进行了研究,给出了掺杂比例与材料热扩散率的关系曲线,结果发现Sr2FeMoO6样品随着参杂Sm浓度的增加,结构发生变化的同时,样品的热扩散率也随着波动变化。这与文献[1]中给出的结论有明显不同,从声子、电子、自旋及其相互作用角度揭示了与文献[1]不同的根本原因;并且从x射线和热扩散率两个角度给出了样品Sr2-xSmxFeMoO6结构转变的参杂比例在10—13%的范围,说明光热偏转技术方法是研究参杂镧系元素的双钙钛矿结构和电子参杂效应的可行有效方法。

Sr2-xSmx FeMoO6Sr2-x （x = 0,0.03,0.05,0.08,0.10,0.13,0.15,0.20） polycrystalline structure sample is prepared by solid-sintering method and tested the material＇s structure by the X-ray diffraction. Photo-thermal deflection technique is used to study the thermal diffusivity of the material. A diagram of curves illustrates the relationship between proportion of different mixing and the thermal diffusivity of the material. The result shows that with the increasing degree of concentration of mixing Sin, thermal diffusivity of the sample undulates with the structural changes of Sr2FeMoO6. It is different from that of in bibliography[1]. The essential reasons are revealed from phonon, electron, spin and their interaction. And the proper mixing proportion of structural conversion of the sample Sr2-xSmxFeMoO6 occurs at the range of 10% -13%. It proves that photothermal deflection technique is effective and practical in researching the structure of double perovskites mixing with lanthanide and its effect of electron mixing.