Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 6    No. 3    September 1996

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PREPARATION OF NANOCOMPOSITE BINARY GADOLINIUM ALLOYS AND THEIR ENHANCED MAGNETIC ENTROPY CHANGE
Zhang Jieli, Shao Yuanzhi

Department of Physics, Zhongshan University, Guangzhou 510275

Abstract:Investigation on magnetocaloric effects, magnetic entropy, Curie temperature and specific heat of nanocomposite binary gadolinium alloys Gd-Tb, Gd-Zn and Gd-Y has been fulfilled with an applied magnetic intensity 1 T and in a temperature range 233~313K. Compared with the same bulk alloys, the asprepared nanocomposite alloys show increasing specific heat and decreasing Curie temperature. The nanocomposite alloy Gd-Y even reveals the distinctive enhancement of both magnetocaloric effects and magnetic entropy over that of the same bulk alloy, which is of importance on developing new substance materials for practical magnetic refrigeration. A discussion concerning enhanced magnetic entropy in nanometer superparamagnetic system is presented in detail.

 

Key words: nanocomposites magnetic refrigeration rare earth

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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