研究了SiO2－AlN复合材料介电性能随测试温度和测试频率变化的温度特性和频率特性,结果说明:SiO2－AlN复合材料的极化机理表现为空间电荷极化。介电性能的温度特性说明1350℃下热压烧结的SiO2－AlN复合材料介电损耗随测试温度基本不变,表现了与SiO2材料相一致的介电稳定性,并基于Debye弛豫方程作了分析。介电性能的频率特性说明极化弛豫普适关系适用于SiO2－AlN复合材料。
Temperature dependence and frequency dependence of dielectric properties of SiO2－ AlN composites were investigated according to the basic dielectric theory. The results showed that the main polarization mechanism of SiO2－ AlN composites was space charge polarization. The temperature dependence of dissipation factor showed that dissipation factor of SiO2－ AlN composites hot－ pressed at 1350℃ was independent of experimental temperature. The frequency dependence showed that SiO2－ AlN composites followed the universal relation in the frequency range 10kHz to 3MHz.
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