National Engineering Research Center of Electromagnetic Radiation Control Materials , University of Electronic Science and Technology of China , Chengdu , 610054 , China.
Key Laboratory of Multi-Spectral Absorbing Materials and Structures of Ministry of Education , University of Electronic Science and Technology of China , Chengdu , 610054 , China.
Inorg Chem. 2018 Jul 16;57(14):8264-8275. doi: 10.1021/acs.inorgchem.8b00873. Epub 2018 Jun 29.
Structure and microwave properties of xZnTiNbO-(1 - x)ZnNbTiO ceramics in the range of x = 0.0-1.0 were investigated. Rietveld refinement analysis and Raman spectra show that rutile- and orthorhombic-type solid solutions formed at 0-0.2 and 0.65-1, a composite at 0.2-0.64. In the solid solution regions, chemical bonds are enlarged. In this case, the Zn/Ti/Nb-O1 bond covalency and bond susceptibility are reduced, and lattice energy and thermal expansion coefficient increase along with x increases, which is mainly responsible for the development of microwave dielectric properties. Furthermore, far-infrared spectra and a classical oscillator model were used to discuss the intrinsic dielectric properties in detail. Temperature stable ceramic was obtained for x = 0.516: ε ∼ 46.11, Q × f ∼ 27 031 GHz, and τ ∼ -1.51 ppm/°C, which is promising for microwave applications.
研究了 xZnTiNbO-(1-x)ZnNbTiO 陶瓷在 x = 0.0-1.0 范围内的结构和微波性能。Rietveld 精修分析和拉曼光谱表明，在 0-0.2 和 0.65-1 范围内形成了金红石型和正交型固溶体，在 0.2-0.64 范围内形成了复合固溶体。在固溶体区域，化学键被扩大。在这种情况下，Zn/Ti/Nb-O1 键的共价性和键敏感性降低，晶格能和热膨胀系数随 x 的增加而增加，这主要是微波介电性能发展的原因。此外，远红外光谱和经典振荡器模型被用来详细讨论内在介电性能。对于 x = 0.516，获得了ε ∼ 46.11、Q×f ∼ 27 031 GHz 和 τ ∼ -1.51 ppm/°C 的温度稳定陶瓷，这对于微波应用具有很大的应用前景。
