【摘要】 研究了Li₂O、MgO和Li₂O+MgO等添加剂对β″-Al₂O₃的形成、显微结构以及电性能的影响,与MgO相比,Li₂O更有利于β″-Al₂O₃的形成,因而有较高的电导率,但也较易促进晶粒长大。混合添加剂的效应随组成不同而异。过量的添加剂由于沉积在晶界,增加晶界电阻率,从而产生不利影响。更多还原

【Abstract】 The effects of Li₂O, MgO and Li₂O+MgO on β″-alumina formation, microstructure and electrical properties are investigated. Li₂O has dominant effect on β″-alumina formation and consequently increases the electrical conductivity but is less favorable in controlling grain size compared with MgO. Mixed additives show different effects with different concentrations. Excessive additives are not desirable due to the deposition on the grain boundary and increase in electrical resistivity of the grain boundary.更多还原