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Er₂AlFe₁₂Mn₄化合物的反常热膨胀

Negative thermal expansion of the Er₂AlFe₁₂Mn₄ compound

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【Author】 FU Bin~1 ZHAO Miao~1 WANG Zhi~2 WANG Lin~1 HAO Yan-ming~1 (1.Collage of Physics and Electronic Information Science,Tianjin Normal University,Tianjin 300074,China; 2.College of Science,Tianjin University,Tianjin 300072,China)

【机构】天津师范大学物理与电子信息学院；天津大学理学院；天津师范大学物理与电子信息学院天津300074；天津300074；天津300072；

【摘要】利用X射线衍射和磁测量手段对Er₂AlFe₁₂ Mn₄化合物磁性和结构进行了研究,结果表明室温下Er₂AlFe₁₂Mn₄化合物具有单相的Th₂Ni₁₇型结构,其居里温度约为230K。在106～652K温度范围内对Er₂AlFe₁₂Mn₄化合物做变温X射线衍射测量,结果表明在236～259K的温度区间出现反常热膨胀现象,其平均热膨胀系数α≈-2．03×10^-5/K。更多还原

【Abstract】 The Er₂AlFe₁₂Mn₄ compound has been investigated by means of X-ray diffraction and magnetic meas- urements.The result indicates that the Er₂AlFe₁₂Mn₄ compound has a single-phase Th₂Ni₁₇-type structure and its Curie temperature is about 230K.The result of X-ray diffraction from 160～652K shows that there appears a negative thermal expansion phenomenon from 236～259K and the average thermal expansion coefficient is—2.03×10^-5/K.更多还原