通过辊压成型及随后的可控结晶过程,制备Pb2Nb2O7 -NaNbO3-SiO2系纳米复合材料.X射线衍射分析结果表明:温度为750～900 ℃时,Pb2Nb2O7,NaNbO3和PbNb2O6晶相可在玻璃基体中析出;Pb2Nb2O7相在750 ℃结晶析出,850 ℃消失;NaNbO3为850 ℃时的主晶相;而PbNb2O6相的晶化温度为850 ℃;由可控结晶技术制备的玻璃陶瓷介电性能受热处理过程中所形成的相组成影响很大;试样在850 ℃退火3 h,具有最高的介电常数(＞600).微观结构分析结果表明,残余玻璃相填充在纳米晶粒的晶界处.电镜分析进一步发现,850 ℃退火3 h的试样中不均匀地分布着纳米NaNbO3和PbNb2O6颗粒,这是材料具有高介电常数的主要原因.
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