用传统氧化物合成法于950℃低温烧结制备出掺杂二价离子的PNN基弛豫铁电陶瓷,研究了二价离子(Mg 2+、Ca 2+、Sr 2+和Ba2+)掺杂对PNN基陶瓷结构和性能的影响.结果表明:掺杂不同的二价离子会有不同的焦绿石相出现,掺杂Mg2+对PNN基陶瓷的介电性能影响不大;而掺杂Ca2+、Sr2+和Ba2+可促进PNN基陶瓷收缩致密化,有效提高PNN基陶瓷的介电温度稳定性,使居里温度向低温方向移动.在几种二价离子中,掺加Sr2+后的PNN基陶瓷不仅显微组织最致密,而且具有较大的绝缘电阻率和优异的温度稳定性.
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