%0 Journal Article
%T PREPARATION AND PROPERTIES OF PT / SiO_2 FINE COMPOSITES<br>PT／SiO2精细复合材料的制备及其特性
%A ZHOU Qifa
%A ZHANG Jinxiu
%A ZHANG Liangying
%A YAO Xi
%A <br>周歧发
%A 张进修
%A 张良莹
%A 姚熹
%J 材料研究学报
%D 1995
%I 
%X T ultrafine Powders dispersed in SiO2 (PT / SiO2) were prepared by two step hydrolysis method. Si(OC2H5)4 was at first partically hydrolyzed by dropping it into a mixed solution of H2O, C2H5OH and HCl for first hydrolysis 1 hour. The resultant homogeneous solution was hydrolyzed with the second hydrolysis solution. In the second hydrolysis reaction, NH4OH was used as a catalyst instead of HCl, PT dispersed in solution such as H2O or C2H5OH was mixed.After stirring about three minutes, the solution was Poured into Polystyrene containers,covered and left for 2-3 days to form a stiff gel, followed by drying, and heated at lower temperture, PT / SiO2 fine composites were obtained. Structure changes of PT / SiO2 were analyzed by XRD, results indicated that grain size of PT particle in matrix was decreased with increased temperature. Dielectric properties and Raman spectra were analyzed. The third-order nonlinear optical susceptibility(X(3)) was determined by the degenerate four-wave mixing(DFWM) method, the X(3) value was as high as 10-11 esu. It was shown that the material exhibits large third order susceptibility.
%K fine composites
%K Sol-Gel
%K nonlinear optics<br>精细复合材料
%K 溶胶－凝胶
%K 非线性光学
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=84529CA2B2E519AC&jid=C101C4C04993B4D94FCD8446E6CBEB3B&aid=BF469665AA4AA6DFF9D0D0CB7938A317&yid=BBCD5003575B2B5F&vid=9CF7A0430CBB2DFD&iid=CA4FD0336C81A37A&sid=4F2F18DD6F870C2C&eid=80A07035DF96B0C4&journal_id=1005-3093&journal_name=材料研究学报&referenced_num=0&reference_num=3