摘要
以硬脂酸、硝酸镧、氢氧化钠和钛酸四丁酯为原料制备了La0 .5Na0 .5TiO3 纳米晶 ,粒度最小可达 1 4nm ,烧成温度为 50 0℃ ,低于传统固相反应的合成温度。光致发光研究表明 :用 392nm光作激发光 ,在室温下观察到了一个强的蓝光发射带 ,并且它的强度和半宽度随粒度发生明显变化。
La 0.5 Na 0.5 TiO 3 nanocrystals of various grain sizes were prepared by stearic acid gel method (SAG),using stearic acid,lanthanum nitrate,sodium hydroxide and tetrabutyl titanate as the starting materials.The temperature in the synthesis was 500℃ and that in the formation of perovskites oxide was higher than 1200℃ by conventional solid state reaction method. The nanocrystalline La 0.5 Na 0.5 TiO 3 samples were characterized by X ray diffraction and photoluminescene spectra,respectively.An emission of strong blue light was observed at room temperature,visible to naked eye at dark,upon excitation with the 392 nm line of an xenon lamp.
出处
《化学研究》
CAS
1998年第1期44-47,共4页
Chemical Research
基金
河南省自然科学基金
