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48.3(0.61CaTiO3-xNd2/3TiO3)-51.7MgTiO3 复合陶瓷的制备和性能

DOI: 10.14062/j.issn.0454-5648.2015.12.05

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Abstract:

用传统固相法制备48.3(0.61CaTiO3-xNd2/3TiO3)-51.7MgTiO3复合陶瓷。研究在1320℃烧结时Nd3+含量和保温时间对复合陶瓷微观形貌、相组成和介电性能的影响。结果表明复合陶瓷的气孔率随Nd3+含量的增加先下降后上升,相对介电常数εr和谐振频率温度系数τf随Nd3+含量的增加而降低,品质因数Q·f值随Nd3+含量的增加先上升后下降,之后再上升。当x<0.48时,保温7h所得样品的气孔率较低;x≥0.48时,保温4h的样品气孔率较低。保温时间对材料谐振频率温度系数几乎没有影响。当烧结温度为1320℃、保温4h和Nd3+含量为0.54时,样品性能较佳εr=45.28,τf=73.76×10–6/℃,Q·f=35002GHz。加入Nb5+并复合ZnAl2O4后,得到的0.96(48.3(Ca0.60Nb0.16TiO3-0.54Nd2/3TiO3)-51.7MgTiO3)-0.04ZnAl2O4复合陶瓷的εr=41.24、τf=39.44×10–6/℃。

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