Synthesis, characterization, and microwave dielectric properties of ixiolite-structure ZnTiNb2O8 ceramics through the aqueous sol–gel process
作者:Q.J. Mei、C.Y. Li、J.D. Guo、H.T. Wu
DOI:10.1016/j.jallcom.2014.12.031
日期:2015.3
characterized for the evaluation of crystallinity by mean of transmission electron microscopy. Sintering characteristics and microwavedielectricproperties of ZnZrNb2O8 ceramics were studied depending on sintering temperatures ranging from 1100 to 1250 °C. The dielectricproperties were strongly dependent on the compositions, the densifications and the microstructures of the specimens. With the increase
采用水溶胶-凝胶法制备了基于单斜结构 ZnZrNb2O8 的微波介电陶瓷。在 600°C 下成功获得了粒径为 10-30 nm 的高反应性纳米级 ZnZrNb2O8 粉末作为前驱体。并且通过 DTA-TG 和 XRD 分析研究了相形成的演变。通过透射电子显微镜对选定区域的电子衍射图和高分辨率晶格图像进行表征,以评估结晶度。研究了 ZnZrNb2O8 陶瓷在 1100 至 1250 °C 的烧结温度范围内的烧结特性和微波介电性能。介电性能强烈依赖于样品的成分、致密化和微观结构。随着烧结温度的升高,密度、er 和 Q·f 值增加并在 1200 °C 达到饱和,具有优异的微波性能:ɛ r 为 27.38,Q·f 值为 66,700 GHz,τ f 值为 -38.4 ppm/° C。还研究了 ZnZrNb2O8 陶瓷的微观结构和介电性能的相关性。
Enhanced visible light absorption and photocatalytic activity of [KNbO<sub>3</sub>]<sub>1−x</sub>[BaNi<sub>0.5</sub>Nb<sub>0.5</sub>O<sub>3−δ</sub>]<sub>x</sub> synthesized by sol–gel based Pechini method
[KNbO3]1−x[BaNi0.5Nb0.5O3−δ]x were synthesized by Pechini sol–gel method at low temperature. Visible light photocatalytic performance of this material was evaluated.