采用传统固相烧结工艺制备BaBi4Ti4O15(BBT)陶瓷,研究了氧化铋过量与铌掺杂量对试样晶相、微观组织结构以及压电介电性能的影响.结果表明:各试样都形成了与BBT相同的单一相结构,说明适量氧化铋过量和B位Nb5+掺杂并未改变BBT陶瓷的晶体结构;随着Nb5+掺杂量的增加,晶粒尺寸持续降低,但是超过Nb5+的固溶限度后,细化效果不再明显增加;压电常数和相对介电常数随掺杂量增加先增后减,其峰值也出现在Nb5+的固溶限度处.介质损耗始终呈现增长趋势,但增长幅度不大.由此可见Nb5+固溶限度点是性能转变的关键点.
BaBi4Ti4O15(short for BBT)ceramics were prepared by solid-state reaction technology.The effects of different excess Bi and Nb5+ doping on the ceramics were investigated respectively,mainly including its phase compositions,microstructures,piezoelectric constant d33,relative dielectric constant εr and dielectric loss tanδ.The results show that the single phase was formed in all the specimens as in BBT,because the crystal structure of the ceramics wasn't changed by the right amount of excess Bi and Nb5+ doping.With the increase of the amount of Nb5+,the grains continued shrinking,but the effect didn't continue any longer when the amount exceeded the solid solubility limit of Nb5+.Both d33 and εr increased firstly and decreased then,and the peak values were got at the point of the solubility limit of Nb5+.Tanδ increased continuously in a very minor scale.So the solid solubility limit of Nb5+ is the key point.
参考文献
| [1] | 郝华,刘韩星,欧阳世翕.铋层状结构铁电材料的性能与改性研究[J].硅酸盐通报,2004(02):52-56. |
| [2] | 赁敦敏,肖定全,朱建国,余萍,鄢洪建.铋层状结构无铅压电陶瓷的研究与进展--无铅压电陶瓷20年发明专利分析之三[J].功能材料,2003(05):491-495. |
| [3] | 张丽娜,李国荣,赵苏串,郑嘹赢,殷庆瑞.Nb掺杂Bi4Ti3O12层状结构铁电陶瓷的电行为特性研究[J].无机材料学报,2005(06):1389-1395. |
| [4] | 郭文华,李钢.Nb2O5掺杂对BaTiO3陶瓷介电常数的影响[J].中国陶瓷,2006(10):24-26. |
| [5] | 路朋献,马秋花,邹文俊,侯永改,王改民,王春华.Nb2O5掺杂对PZN-PZT压电陶瓷微观结构和电性能的影响[J].稀有金属,2007(02):248-252. |
| [6] | 黄新友,陈志刚,李军,高春华.Nb2O5/Co2O3加入量对（Ba,Sr）TiO3基电容器陶瓷介电性能的影响[J].人工晶体学报,2006(03):623-626,634. |
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