在钛酸锶钡(BSTO)与质量分数为60%的MgO混合的基础上,研究了MnCO3掺杂对BSTO/MgO复相铁电陶瓷介电性能的影响.随着MnCO3掺杂量的增加,BSTO晶粒尺寸减小.适量的MnCO3的掺杂可明显降低BST/MgO复相材料的高频损耗以及显著提高材料的调谐性.当MnCO3掺杂量为0.5%(物质的量分数)时,BSTO/MgO 材料的介电常数为94,高频损耗为2.91×10-3(4.191 GHz),介电常数可调率达7.4%(2 kV/mm).
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