J Mater Sci Technol ›› 1997, Vol. 13 ›› Issue (4): 359-360.
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Xisheng YE;Jian SHA and Zhengkuan JIAO(Dept. of Physics, Zhejiang University, Hangzhou 310027. China)Zifei PENG and Lide ZHANG(Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China)