镁在钙钛矿型氧敏材料中的作用  

Roles of Mg addition in perovskite oxygen sensing materials

作　　者：曹全喜[1] 邓亮雄[1] 杨鹏[1] 黄云霞[1] 王毓鹏[1] 

机构地区：[1]西安电子科技大学技术物理学院,陕西西安710071

出　　处：《西安电子科技大学学报》2005年第3期353-356,共4页Journal of Xidian University

基　　金：国家科技部;陕西省自然科学基金资助项目(2002F10);西安交通大学电力设备电气绝缘国家重点实验室开放基金资助

摘　　要：讨论了添加剂镁(Mg)在钙钛矿型氧敏陶瓷中的作用和影响.利用固相合成法制备了不同Mg含量的样品,并在不同的温度、不同的氧分压下进行了阻温特性、氧敏特性的测量和TPD测量.研究表明,在SrTiO3中Mg2+替位Ti4+可使SrTiO3实现p型掺杂;适量的Mg掺杂,可使p型区向低氧分压方向扩展;受主掺杂促进了氧空位的产生,提高了杂质的固熔限;Mg掺杂促进环境氧与晶格氧的交换,提高了氧灵敏度;高于20mol%的Mg掺杂可产生Sr2TiO4,提高了材料的电阻率.The roles and effects of Mg addition in perovskite oxygen sensing ceramic are studied. The Mg contents in SrTiO3 are taken as different. It was measured that the dependence of resistance on temperature and oxygen sensing behavior at different temperatures and oxygen partial pressures. The characteristic of adsorbed oxygen on the specimens is investigated by means of TPD. Where there is substitution of Mg2+ at the Ti4+ site, the p-type region of SrTiO3 ceramic can be expanded, extrinsic oxygen vacancy can be produced and solid solubility limit of acceptor can be raised simultaneously. The exchange quantity of oxygen is increased between specimen and ambient, so it is possible to obtain SrTiO3 exhibiting high oxygen sensitivity. However, a part of addition of Mg above 20 mol% increases resistivity because of Sr2TiO4 segregation.

关 键 词：钙钛矿 氧敏材料 镁 功能陶瓷 

分 类 号：TN304[电子电信—物理电子学]