非铁电压电复合陶瓷SrTiO3-Bi12TiO20(ST-BT)的正电子湮没谱学研究
Positron annihilation spectrum study in non-ferroelectric piezoelectricity SrTiO3-Bi12TiO20 (ST-BT) composite ceramics
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摘要: 采用传统陶瓷烧结工艺成功制备出新型非铁电压电复合陶瓷SrTiO3-Bil2TiO20(ST-BT),利用正电子湮没技术,对ST-BT复合陶瓷烧结过程进行了研究,讨论了烧结过程中材料内部的缺陷变化特征,给出了烧结温度对该复合陶瓷结晶度和缺陷结构的影响.发现烧结温度在860L-940℃,烧结时间为3h的实验条件下,ST-BT复合陶瓷已趋于稳定,出现了大量的单空位型缺陷.烧结温度超过980℃将引起Bil2Ti020相的大量分解,杂相的出现造成缺陷的聚集,形成大尺度的微空洞.实验结果表明,烧结温度在920-940℃的烧结条件下,ST-BT复合陶瓷的结构特性及压电性能均表现出较好的稳定性.Abstract: The positron annihilation lifetime spectroscopy, combined with X-ray diffraction and scanning electron microscopy is used to measure a new type of non-ferroelectric piezoelectricity SrTiO3-Bi12TiO20 (ST-BT) composite ceramic, which is prepared by conven- tional solid-state reaction in Shandong University. The structural characteristics and sinter process for ST-BT composite ceramic are systematically studied. A large number of crystal defects are observed in ST-BT composite ceramic with the sintering temperature be- ing between 860 to 940 ℃. The large scale defects are formed due to the Bi12TiO2o phase decomposed when the sintering temperature rises to 980 ℃. The experimental results indicate that the structural characteristic and piezoelectricity of ST-BT composite ceramic shows good stability with the sintering temperature being between 920 to 940 ℃.
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