J Mater Sci Technol ›› 1993, Vol. 9 ›› Issue (3): 157-160.
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Renmin LIU Guoliang WU Jiangshan LUO General Research Institute of Nonferrous Metals,Beijing,100088,ChinaJohn H.Kennedy Zhengming ZHANG Department of Chemistry,University of California,Santa Barbara,USAQin LIN University of Science and Technology Beijing,