Crystal structure and phase relations of Pr₂Fe₁₄B-La₂Fe₁₄B system

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• 作者：Qingrong YAO (姚青荣)^a ; ^b ; ^{qingry96@163.com" class="auth_mail" title="E-mail the corresponding author} ; Yihao SHEN (沈逸豪)^a ; Pengcheng YANG (杨鹏程)^a ; Huaiying ZHOU (周怀营)^a ; ^c ; Guanghui RAO (饶光辉)^a ; Jianqiu DENG (邓建秋)^a ; Zhongmin WANG (王仲民)^a ; Yan ZHONG (钟 燕)^a ; ^c ; ^d
• 关键词：crystal structure ; lattice parameter ; Curie temperature ; thermal analysis ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：34
• 期：11
• 页码：1121-1125
• 全文大小：2985 K

文摘

The crystal structure and phase relations of the Pr₂Fe₁₄B-La₂Fe₁₄B system were investigated by X-ray powder diffraction (XRD), differential scanning calorimetry (DSC) and scanning electron microscopy (SEM) equipped with energy dispersive X-ray spectroscopy (EDS). The crystal structure parameters were determined by full-profile Rietveld refinements. The results revealed that all alloys of (Pr_1–xLa_x)₂Fe₁₄B crystallized the Nd₂Fe₁₄B-type structure with the space group P4₂/mnm and formed a continuous solid solutions between x=0.0 and 1.0. The lattice parameter a, c, unit-cell volume V and c/a ratio increased linearly with the La concentration. Determined by thermogravimetry analysis, the Curie temperature (T_C), phase transition temperature and melting temperature of (Pr_1–xLa_x)₂Fe₁₄B decreased linearly upon the La content. Based on the results of DSC measurements and X-ray powder diffraction examinations, the phase diagram of the Pr₂Fe₁₄B-La₂Fe₁₄B system was built up.