J Mater Sci Technol ›› 1997, Vol. 13 ›› Issue (4): 364-366.
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Yanqi WANG and Xijun WU(Dept. of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China)Linhua YE; Limin TONG and Yonghang SHEN(Dept. of Physics, Zhejiang University, Hangzhou 310027, China)