【摘要】 以氧化锡（SnO₂）、五氧化二铌（Nb₂O₅）和三氧化二锑（Sb₂O₃）粉末为原料,通过无压固相烧结技术制备了SnO₂基导电陶瓷,研究了Nb₂O₅单掺杂及Nb₂O₅-Sb₂O₃双掺杂SnO₂基陶瓷的电导率和热膨胀性。采用X射线衍射仪对试样物相结构进行了表征。研究发现,当Nb₂O₅掺杂量为14%（摩尔分数,下同）时,SnO₂基陶瓷800℃的电导率达10.51S/cm;在此基础上,当Sb₂O₃添加量为2%时,500℃的电导率达1.61S/cm。SnO₂-Nb₂O₅基陶瓷的热膨胀系数随Nb₂O₅掺杂量的增加而降低,Sb₂O₃的添加使SnO₂基陶瓷的热膨胀系数增大。X射线衍射仪分析结果表明,Nb₂O₅能均匀分布在SnO₂粉末中,形成稳定的固溶体;Sb₂O₃的添加不利于Nb₂O₅形成稳定的固溶体。更多还原

【Abstract】 Tin dioxide based ceramics doped with Nb₂O₅ and Sb₂O₃ are prepared by the pressureless sintering. Bulk conductivity and thermal expansion coefficient are measured.Results show that the conductivity of tin dioxide based ceramics is 10.51S/cm at 800℃when the content of Nb₂O₅ is 14mol%;Based on this component,conductivity of tin dioxide ceramics doped with Nb₂O₅-Sb₂O₃ is 1.61S/cm at 500℃when the content of Sb₂O₃ is 2mol%.Thermal expansion coefficient of SnO₂-Nb₂O₅ declines with the content of Nb₂O₅ increasing.The phase of SnO₂-Nb₂O₅ is analyzed by X-ray diffraction,and the results show that it is rutile crystal structure,implying that Nb₂O₅ is uniformly distributed into SnO₂ and forms solid solution.But Sb₂O₃ is bad for forming solid solution.更多还原