Thermal expansion anomaly and spontaneous magnetostriction of Gd2Fe17 compound

Materials with negative thermal expansion have many practical applications. However, these materials are known in only several oxide systems, and when the negative thermal expansion occurs, the contraction is usually small and limited to a narrow temperature range beyond room temperature. For obtain...

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Bibliographic Details
Published inJournal of rare earths Vol. 29; no. 8; pp. 772 - 775
Main Author 郝延明 梁飞飞 张学敏 王芳 吴延昭
Format Journal Article
LanguageEnglish
Published College of Science, Tianjin University of Science & Technology, Tianjin 300222, China 01.08.2011
Subjects
化合物
射线衍射
异常
温度范围
热膨胀系数
磁学性质
自发磁致伸缩
负热膨胀材料
negative thermal expansion
spontaneous magnetostriction
Gd2Fe17 compound
rare earths
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ISSN1002-0721
2509-4963
DOI10.1016/S1002-0721(10)60540-6

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Summary:Materials with negative thermal expansion have many practical applications. However, these materials are known in only several oxide systems, and when the negative thermal expansion occurs, the contraction is usually small and limited to a narrow temperature range beyond room temperature. For obtaining a compound with negative thermal expansion in broad temperature range, the structural and magnetic properties of Gd2Fe17 compound were investigated by means of X-ray diffraction and magnetization measurements. The Gd2Fe17 compound annealed at 1050 oC had a Th2Zn17-type structure. There existed an anisotropic strong spontaneous magnetostriction and a negative thermal expansion in Gd2Fe17 compound. The average thermal expansion coefficients was =–7.40×10–6/K in the temperature range of 294–453 K and =–1.80×10–5/K in 453–534 K, respectively. The spontaneous magnetostrictive deformation ωS decreased from 4.34×10–3 to near zero with temperature increasing from 294 to 572 K. The spontaneous linear deformation λc was much larger than λa at the same temperature below about 500 K.
Bibliography:negative thermal expansion; spontaneous magnetostriction; Gd2Fe17 compound; rare earths
11-2788/TF
Materials with negative thermal expansion have many practical applications. However, these materials are known in only several oxide systems, and when the negative thermal expansion occurs, the contraction is usually small and limited to a narrow temperature range beyond room temperature. For obtaining a compound with negative thermal expansion in broad temperature range, the structural and magnetic properties of Gd2Fe17 compound were investigated by means of X-ray diffraction and magnetization measurements. The Gd2Fe17 compound annealed at 1050 oC had a Th2Zn17-type structure. There existed an anisotropic strong spontaneous magnetostriction and a negative thermal expansion in Gd2Fe17 compound. The average thermal expansion coefficients was =–7.40×10–6/K in the temperature range of 294–453 K and =–1.80×10–5/K in 453–534 K, respectively. The spontaneous magnetostrictive deformation ωS decreased from 4.34×10–3 to near zero with temperature increasing from 294 to 572 K. The spontaneous linear deformation λc was much larger than λa at the same temperature below about 500 K.
HAO Yanming , LIANG Feifei, ZHANG Xuemin , WANG Fang , WU Yanzhao （College of Science, Tianjin University of Science ＆ Technology, Tianjin 300222, China）
ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(10)60540-6