Tm2CrFe16-xSix化合物的结构和居里温度 |
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引用本文: | 袁义哲,;吴桃李,;吴延昭,;郝延明.Tm2CrFe16-xSix化合物的结构和居里温度[J].天津轻工业学院学报,2009(5):32-35. |
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作者姓名: | 袁义哲 ;吴桃李 ;吴延昭 ;郝延明 |
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作者单位: | [1]天津科技大学理学院,天津300457; [2]北京大学物理学院,北京100871 |
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基金项目: | 国家自然科学基金资助项目(50871074);天津科技大学科学研究基金资助项目(20080210) |
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摘 要: | 通过X射线衍射和磁测量手段研究Tm2CrFe16-xSix(X=0,0.5,1.0,1.5,2.0,2.5,3.0)化合物的结构和居里温度.结果表明,Tm2CrFe16-xSix化合物具有Th2Ni17型结构,随着Si替代量X的增加,Tm2CrFe16-xSix化合物的单胞体积、晶胞参数都减小.在Tm2CrFe16-xSix化合物中存在着各向异性的磁弹耦合效应.随着x的增加,Tm2CrFe16-xSix化合物的居里温度升高,在x=1.5时达到最大值,约为450K,比Tm2Fe17化合物的居里温度高出约140K,当x继续增加时,Tm2CrFe16-xSix化合物的居里温度下降.
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关 键 词: | Tm2CrFe16-xSix化合物 X射线衍射 居里温度 |
Structure Property and Curie Temperature of Tm2CrFe16-xSix Compound |
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Affiliation: | YUAN Yi-zhe, WU Tao-li, WU Yan-zhao, HAO Yan-ming (1. College of Science, Tianjin University of Science & Technology, Tianj in 300457, China; 2. School of Physics,Peking University,Beijing 100871,China) |
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Abstract: | The crystal structure property and the Curie temperature of Tm2CrFe16-xSix(x=0,0.5,1.0,1.5,2.0,2.5, 3.0) compounds have been investigated by means of X-ray diffraction and magnetization measurements. These compounds have Th2Ni17-type structure. The unit-cell volume and the unit-cell parameters a and c decrease with increasing x. The result of analysis shows there is an anisotropy magneto-elastic effect in Tm2CrFe16-xSix compounds. The Curie temperature Tc of Tm2CrFe16-xSix compound increase with increasing x first,then decrease with further increasing x,the maximum value of Tc is about 450 K forx=1.5. This value is about 140 K greater than that of the mother compound Tm2Fe17. |
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Keywords: | Tm2CrFe16-xSix compound X-ray diffraction Curie temperature |
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