Synthesis, characterization, and microwave dielectric properties of Ni0.5Ti0.5NbO4 ceramics through the aqueous sol–gel process
Synthesis, characterization, and microwave dielectric properties of Ni0.5Ti0.5NbO4 ceramics through the aqueous sol–gel process
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DOI：
10.1016/j.jallcom.2015.08.179
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发表时间：
2015-12
影响因子：
6.2
通讯作者：
J. Bi;Changhong Yang;H. T. Wu
中科院分区：
文献类型：
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作者：
J. Bi;Changhong Yang;H. T. Wu
采用水相溶胶-凝胶法制备了一种基于四方金红石结构Ni0.5Ti0.5NbO4（NTN）的介电陶瓷。主要目的是通过溶胶-凝胶法显著降低陶瓷烧结温度，同时保持可接受的性能。进一步的目标是优化三个关键特性-相对介电常数（εr），品质因子（Q·f）和谐振频率温度系数（τf）。以800℃为前驱体，成功制备了粒径为20 ~ 50 nm的高活性纳米NTN粉体。在850 ~ 1200℃的烧结温度范围内，研究了ni0.5 ti0.5 nbo4陶瓷的烧结特性和微波介电性能。在1100℃时，Ni0.5Ti0.5NbO4（NTN）陶瓷具有优异的微波性能，εr= 59.95, Q·f= 15094 GHz,τf= 111.15 ppm/℃。该陶瓷具有较低的烧结温度和优异的微波介电性能，在微波器件中具有广阔的应用前景。
A kind of dielectric ceramic based on tetragonal rutile structure Ni0.5Ti0.5NbO4(NTN) was prepared by the aqueous sol–gel process. The main objective was to significantly reduce the ceramic sintering temperature by sol–gel process while maintaining acceptable properties. A further objective was to optimize the three key properties-relative permittivity (εr), quality factor (Q·f) and the temperature coefficient of resonant frequency (τf). Highly reactive nanosized NTN powders with particle sizes of 20–50 nm were successfully obtained at 800 °C as precursors. Sintering characteristics and microwave dielectric properties of Ni0.5Ti0.5NbO4ceramics were studied depending on sintering temperatures ranging from 850 °C to 1200 °C. The excellent microwave properties of Ni0.5Ti0.5NbO4(NTN) ceramic was found at 1100 °C withεr= 59.95, Q·f= 15,094 GHz,τf= 111.15 ppm/°C. The lower sintering temperatures and excellent microwave dielectric properties would make these ceramics promising for application in microwave components.