J Mater Sci Technol ›› 1997, Vol. 13 ›› Issue (4): 333-335.
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Xiuchun YANG(Dept. of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China)Gaorong HAN;Xiabin ZHANG; Piyi DU and Zishang DING(Dept. of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China)Ze ZHA