Sintering behavior and microwave dielectric properties of Bi3(Nb1−xTax)O7 solid solutions
Sintering behavior and microwave dielectric properties of Bi3(Nb1−xTax)O7 solid solutions
复制标题
DOI：
10.1016/j.matchemphys.2008.02.025
复制
发表时间：
2008-08
影响因子：
4.6
通讯作者：
Di Zhou;Hong Wang;X. Yao;L. Pang
中科院分区：
文献类型：
--
作者：
Di Zhou;Hong Wang;X. Yao;L. Pang
采用固相反应法合成了Bi 3（Nb 1-xTax）O 7（x=0.0，0.3，0.7，1）固溶体，并首次报道了其微波介电性能。在0≤x≤1范围内，在700°C（2 h）− 1下煅烧可得到萤石型的纯相，在990°C以下可得到致密的Bi 3（Nb 1 −xTax）O 7陶瓷。随着x从0.0增加到1.0，Bi 3（Nb 1-xTax）O 7陶瓷的饱和密度从8.2增加到9.1gcm-3，微波介电常数从95减小到65，而Qf值从230增加到560 GHz。用Ta取代Nb，可将谐振频率的温度系数τ从Bi 3 NbO 7的− 113 ppm °C − 1修改为Bi 3 TaO 7的− 70 ppm °C− 1。微波介电常数、Qf值和τ f值与萤石固溶体的结构参数密切相关，并对它们之间的相关性进行了详细讨论。由于Bi 3（Nb 1 −xTax）O 7固溶体陶瓷致密化温度低、微波介电性能好，因此具有良好的低温共烧陶瓷应用前景。
Solid solutions of Bi3(Nb1−xTax)O7(x=0.0, 0.3, 0.7, 1) were synthesized using solid state reaction method and their microwave dielectric properties were first reported. Pure phase of fluorite-type could be obtained after calcined at 700°C(2h)−1between 0≤x≤1 and Bi3(Nb1−xTax)O7ceramics could be well densified below 990°C. As x increased from 0.0 to 1.0, saturated density of Bi3(Nb1−xTax)O7ceramics increased from 8.2 to 9.1gcm−3, microwave permittivity decreased from 95 to 65 while Qfvalues increasing from 230 to 560GHz. Substitution of Ta for Nb modified temperature coefficient of resonant frequency τffrom −113ppm°C−1of Bi3NbO7to −70ppm°C−1of Bi3TaO7. Microwave permittivity, Qfvalues and τfvalues were found to correlate strongly with the structure parameters of fluorite solid solutions and the correlation between them was discussed in detail. Considering the low densified temperature and good microwave dielectric proprieties, solid solutions of Bi3(Nb1−xTax)O7ceramics could be a good candidate for low temperature co-fired ceramics application.