Enhanced Negative Thermal Expansion in La1鈥?i>xPrxFe10.7Co0.8Si1.5 Compounds by Doping the Magnetic Rare-Earth Element Praseodymium

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• 作者：Wen Li ; Rongjin Huang ; Wei Wang ; Jie Tan ; Yuqiang Zhao ; Shaopeng Li ; Chuanjun Huang ; Jun Shen ; Laifeng Li
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：June 2, 2014
• 年：2014
• 卷：53
• 期：11
• 页码：5869-5873
• 全文大小：330K
• 年卷期：v.53,no.11(June 2, 2014)
• ISSN：1520-510X

文摘

Experiments have been performed to enhance negative thermal expansion (NTE) in the La(Fe,Co,Si)₁₃-based compounds by optimizing the chemical composition, i.e., proper substitution of La by magnetic element Pr. It is found that increasing the absolute value of the average coefficient of thermal expansion (CTE) in the NTE temperature region (200鈥?00 K) attributes to enhancement of the spontaneous magnetization and its growth rate with increasing Pr content. Typically, the average CTE of La_1鈥?i>xPr_xFe_10.7Co_0.8Si_1.5 with x = 0.5 reaches as large as 鈭?8.5 脳 10^鈥? K^鈥? between 200 and 300 K (螖T = 100 K), which is 18.5% larger than that of x = 0. The present results highlight the potential applications of La(Fe,Co,Si)₁₃-based compounds with a larger NTE coefficient.