采用传统的陶瓷工艺制备了MgO掺杂的Ba0.6Sr0.4TiO3(BST)陶瓷样品.系统地研究了MgO掺杂量为0.06%～0.18%的Ba0.5Sr0.4TiO3陶瓷的微结构和介电性能.XRD分析显示,在我们所选取的掺杂范围内,MgO并没有影响到BST陶瓷的主晶相钙钛矿结构,且一定量的Mg离子进入到BST的晶格中.扫描电子显微镜对样品的形貌观察揭示了,随着MgO含量的增加其晶粒尺寸逐渐减小.介电性能和介电偏压测试表明,相对未掺杂BST样品的介电损耗明显降低且居里点逐渐向低温移动,可调性随着MgO掺杂量的增加而减小,MgO的掺杂量为0.18%(质量分数)时居里温度移到-49℃,可调性为16%,且样品的居里温度在外加电场作用下向高温方向移动.微波性能测试表明MgO掺杂BST陶瓷相对未掺杂样品具有较高的Q值.
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