Magnetocaloric Effect, Specific Heat, and Entropy of Iron-Substituted Gadolinium Gallium Garnets Gd3(Ga1-xFex)5O12

被引：22
|
作者：
Matsumoto, Koichi [1 ]
Matsuzaki, Ayumi [1 ]
Kamiya, Koji [2 ]
Numazawa, Takenori [2 ]
机构：
[1] Kanazawa Univ, Dept Phys, Kanazawa, Ishikawa 9021192, Japan
[2] Natl Inst Mat Sci, Exploratory Mat Res Labs Energy & Environm, Tsukuba, Ibaraki 3050003, Japan
来源：
JAPANESE JOURNAL OF APPLIED PHYSICS | 2009年 / 48卷 / 11期
关键词：
DEMAGNETIZATION;
D O I：
10.1143/JJAP.48.113002
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
A series of Gd-x(Ga1-xFex)(5)O-12 (GGIG) compounds for magnetic refrigerants were characterized by magnetization and specific heat measurements For comparison, the base compound gadolinium gallium garnet (GGG) was also measured From the magnetization measurements: the entropy change by external magnetic field was confirmed to be enhanced by the addition of iron, as previously reported by the National Institute of Standards and Technology (NIST) group. the specific heat data obtained in various magnetic fields enabled the establishment of temperature entropy (T-S) diagrams, which are essential for thermal cycle analysis. It has been shown that GGIGs with high iron content have a large specific heat in zero field, and are suitable for regenerative thermal cycle. (C) 2009 The Japan Society of Applied Physics
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页数：4
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