Microwave dielectric properties of sol-gel derived NiZrNb2O8 ceramics
Microwave dielectric properties of sol-gel derived NiZrNb2O8 ceramics
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溶胶-凝胶法 NiZrNb2O8 陶瓷的微波介电性能
DOI：
10.1016/j.jallcom.2018.02.300
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发表时间：
2018-05
影响因子：
6.2
通讯作者：
Xiang Maoqiao
中科院分区：
文献类型：
--
作者：
Wu Mengjuan;Zhang Yingchun;Chen Jundan;Xiang Maoqiao
以Nb 2 O 5. nH 2 O为前驱体，采用优化的溶胶-凝胶法制备了NiZrNb 2 O 8微波介质陶瓷。采用差热分析和热重分析（DTA/TG）对Nb 2 O 5·nH 2 O的热分解行为进行了表征。在950 °C左右得到了具有黑钨矿结构的NiZrNb 2 O 8纳米粒子。NiZrNb_2O_8陶瓷的微波介电性能与烧结条件、显微结构和成分有很大关系。基于化合价理论，通过对NiZrNb 2 O 8晶体结构细化、化学键离子性和晶格能的分析，研究了NiZrNb 2 O 8晶体结构与微波介电性能的关系。在1100 °C烧结的NiZrNb 2 O 8陶瓷的相对密度、介电常数、品质因数和谐振频率温度系数分别达到5.585 g/cm 3、29.31、22985 GHz和−24.96 ppm/°C。
NiZrNb2O8microwave dielectric ceramics were prepared by an optimized sol-gel method using Nb2O5·nH2O as a precursor. The thermal decomposition behavior of the Nb2O5·nH2O was characterized by different thermal analysis and thermogravimetry (DTA/TG). Nanoscale NiZrNb2O8particles with wolframite structure were obtained at about 950 °C. Regarding the microwave dielectric properties of NiZrNb2O8ceramics, significant dependence has been verified with the sintering conditions, microstructure and compositions. The correlation between NiZrNb2O8crystal structure and microwave dielectric properties was investigated from the analysis result of crystal structure refinement, chemical bonding ionicity and lattice energy based on the theory of valence. The relative density, dielectric constants, quality factors and temperature coefficients of the resonant frequency of NiZrNb2O8ceramics sintered at 1100 °C reached 5.585 g/cm3, 29.31, 22985 GHz and −24.96 ppm/°C, respectively.
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