New High‐Permittivity AgNb1‐xTaxO3 Microwave Ceramics: Part II, Dielectric Characteristics
New High‐Permittivity AgNb1‐xTaxO3 Microwave Ceramics: Part II, Dielectric Characteristics
复制标题
DOI：
10.1111/j.1151-2916.1999.tb01727.x
复制
发表时间：
2004-12
影响因子：
3.9
通讯作者：
M. Valant;D. Suvorov
中科院分区：
文献类型：
--
作者：
M. Valant;D. Suvorov
具有AgNb1−xTaxO_3(0.46410)的陶瓷样品，而在2 GHz处测量的Q×f值达到640-900GHz。谐振频率对温度的依赖关系不是线性的，但在特定温度下确实表现出最小值，这取决于陶瓷的组成。在射频下测量的样品具有低的损耗因子(Tgδ=7×10−4−18×10−4)、低的老化速率(0.2%/时间十年)和良好的介电强度(在0.6 mm厚度下为8V/μm)。显微组织研究表明，在额外的工艺优化过程中，应该消除析出物和相变孪晶的存在。
Ceramic samples with the AgNb1−xTaxO3 (0.46 410, whereas the Q×f value, measured at 2 GHz, reaches values of 640–900 GHz. Dependence of the resonant frequency on temperature was not linear but did display a minimum at a particular temperature, which was dependent on the composition of the ceramic. Samples that were measured at radio frequencies displayed low dissipation factors (tgδ= 7 ×10−4−18 × 10−4), a low aging rate (0.2% per time decade), and good dielectric strength (8 V/μm at a thickness of 0.6 mm). Microstructural investigations revealed the presence of precipitates and transformation twins that should be eliminated during additional processing optimization.