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Wei-Chih Lee Chi-Yuen Huang Liang-Kuo Tsao Yu-Chun Wu 《Journal of the European Ceramic Society》2009,29(8):1443-1448
A quantitative relation between the morphotropic phase boundary (MPB) composition and the tolerance factor (t) in (Bi0.5Na0.5)TiO3 (BNT)-based piezoelectric ceramics was established. The t value of the MPB compositions in BNT-based ceramics is around 0.990–0.993 and is independent of the types of added compounds. In order to experimentally demonstrate it, two piezoelectric ceramic systems (1 ? x)(Bi0.5Na0.5)TiO3–x(Ba1?aSra)TiO3, a = 0.05 and 0.3 (BNBST5-x and BNBST30-x, x < 12%), were used. X-ray diffraction patterns and the lattice parameter investigations revealed that these two systems formed solid solutions within the studied stoichiometry and showed a rhombohedral–tetragonal phase transformation. Furthermore, both the structure analysis and electric properties measurements indicated that the MPB compositions were BNBST5-6 and BNBST30-8 and their corresponding t value were 0.9900 and 0.9903, respectively. The results confirm the relation between the MPB composition and t value and provide a method for designing new piezoelectric materials. 相似文献
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电镀法制备多孔光催化材料及其性能研究 总被引:1,自引:0,他引:1
以多孔泡沫镍为载体,采用电镀法制备多孔光催化材料,并研究其对水中罗丹明B的降解性能.结果表明,多孔光催化材料对水中罗丹明B的光催化降解反应严格符合零级动力学规律.最佳制备工艺条件为:电镀液中硫酸镍浓度180g/L;镀液中P25型纳米TiO2粉体投加量2g/L;电镀温度45℃;搅拌速度4档.Bi2O3和ZnO复合改性使产品的光催化性能提高,复合粉体中的Bi2O3和ZnO起电子-空穴分离的桥梁作用.纳米Bi2O3复合量达7%或ZnO复合量为2%时,产品的光催化性能最优.Ag修饰使经Bi2O3或ZnO复合的光催化材料的光催化性能有所提高.经Bi2O3复合的光催化材料的最佳Ag修饰量为1%,经ZnO复合的光催化材料的最佳Ag修饰量为4%. 相似文献
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In order to solve the water issues when 13X zeolite was applied to capture CO 2 from wet flue gas by vacuum swing adsorption process, multi-layered adsorption system was considered regarding activated alumina F200 and silica gel based Sorbead WS as pre-layer materials. LBET (extended Largmuir-BET) model and extended CMMS (cooperative multimolecular sorption) equation were simulated respectively to describe water loading on F200 and Sorbead WS. The two equations can be well added into our in-house simulator to simulate double-layered CO 2 -VSA (vacuum swing adsorption) process. Results indicated that water can be successfully stopped in pre-layers with a good CO 2 capture performance. 相似文献
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There are significant effects of process parameters on internal qualities of bloom,and these process parameters are as follows:position and reduction amount,reduction distribution,reduction rate,and so on.Developing a control model is the key to apply soft reduction technology successfully.As the research object,360 mm×450 mm bloom caster in PISCO (Panzhihua Iron and Steel Co.) has been studied,and the research method for control model of dynamic soft reduction has been proposed.On the basis of solidification and heat transfer model,the position of soft reduction and reduction distribution of each frame are determined according to the bloom temperature distribution and solid fraction in bloom center calculated.Production practice shows that the ratio of center porosity which is less than or equal to 1.0,increased to 97.27%,ratio of central segregation which is less than or equal to 0.5,increased to 80.91%,and ratio of central carbon segregation index which is more than or equal to 1.10,decreased to 4% with the applying model of dynamic soft reduction. 相似文献
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