【摘要】 利用X射线衍射方法精确测量了2∶17型稀土化合物N d2A lFe15M n的晶胞参数及热膨胀系数并研究了其结构特征.结果表明,室温下,N d2A lFe15M n化合物具有单相的Th2Zn17型菱方结构(空间群为R 3m).对该化合物晶格常数的测量误差可以达到1-0 4,基本上可满足对一般位移型相变测量要求的精度.更多还原

【Abstract】 The lattice constants and the thermal expansion coefficient of 2∶17 type rare earth-transition metal compound Nd₂AlFe₁₅Mn were obtained by means of X-ray diffraction.The results showed that Nd₂AlFe₁₅Mn compound has a rhombohedral Th₂Zn₁₇-type structure in room temperature.The errors of lattice constant in this compound were able to achieve 10^-4,which basically met the measuring precision in displacive phase transition.更多还原