Initial Study of Strontium Barium Niobate/Strontium Barium Titanium Ceramics through A Modified Sol-Gel
Barium strontium titanate niobate (BSTN) composite ceramics system following the general formula 0.5BaO· 0.5SrO·0.5TiO<,2>·0.5Nb<,2>O<,6> was successfully prepared. The investigation is carried out through a modified sol-gel method. By controlling the viscosity of the sol solution to suspend the strontium barium niobate ceramic powder uniformly which had been made beforehand and the viscosity of the sol could be changed by adjusting the mixture ratio of the precursor. Powders obtained from dried gels were calcined at 800℃ for 3h. The bulk ceramics obtained from the dried powders were sintered at the temperatures of 1250 and 1300℃ respectively. The results of the XRD and SEM indicated that the perovskite phase and the tungsten bronze phase could be coexisted stably in BSTN at both of these temperatures. The increasing of the sintering temperature was good for the crystal phase growing and the solubility of the two phases in the composite ceramics. And the theory of adulteration could be adopted to resolve the henomena that sintering temperatures too high, which resulted in the crystalline grains growing singularly. Some problems were put forward to pay attention to this material research process.
modified sol-gel composite ceramics perovskite phase tungsten bronze phase rare earths
Shan Lianwei(单连伟) Peng Juan(彭娟) Wu Ze(吴泽) Dong Limin(董丽敏) Han Zhidong(韩志东) Zhang Xianyou(张显友)
Material Science Engineering Department of Harbin University of Science and Technology, Harbin 150040, China
国际会议
第五届国际稀土开发与应用研讨会(The Fifth International Conference on Rare Earth Decelopment and Applicatin)
包头
英文
523-526
2007-08-07（万方平台首次上网日期，不代表论文的发表时间）