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首页> 外文期刊>Applied Surface Science >Very high temperature stability and excellent dielectric properties of a novel X9R-type Ca_(1-x)Sr_xCu_3Ti_4O_(12)/TiO_2 nanocomposite synthesized by a polymer pyrolysis technique
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Very high temperature stability and excellent dielectric properties of a novel X9R-type Ca_(1-x)Sr_xCu_3Ti_4O_(12)/TiO_2 nanocomposite synthesized by a polymer pyrolysis technique

机译：高分子热解法合成新型X9R型Ca_（1-x）Sr_xCu_3Ti_4O_（12）/ TiO_2纳米复合材料的高温稳定性和介电性能优异

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A polymer pyrolysis solution method was employed for the synthesis of Ca1-xSrxCu3Ti4O12/TiO2 ceramics. At 30 degrees C and 1 kHz, a high dielectric constant (epsilon') similar to 4193-10,110 and very low loss tangent (tan delta) similar to 0.009-0.039 were achieved. Interestingly, a Ca0.95Sr0.05Cu3Ti4O12/TiO2 ceramic sintered at 1060 degrees C for 5 h displayed a di-electric temperature coefficient (Delta epsilon') of less than +/- 15% over a temperature range -60-210 degrees C, which is wider than that ever reported. All ceramic samples displayed nonlinear J-E characteristics. Sr2+ doping significantly enhanced the breakdown field (E-b) and the nonlinear coefficient (alpha) with the highest E-b of similar to 20,548 V.cm(-1) and a value of similar to 52.06 in a Sr2+-doped ceramic where x=0.05. X-Ray Diffraction (XRD) and Field Emission Scanning Electron Microscopy (FESEM) were employed to study of the influence of Sr2+ doping on the microstructure and phase composition of the samples. The oxidation state of Cu ions in ceramic samples was investigated using X-Ray Absorption Near Edge Spectroscopy (XANES).
机译：采用聚合物热解法合成Ca1-xSrxCu3Ti4O12 / TiO2陶瓷。在30摄氏度和1 kHz下，获得了类似于4193-10,110的高介电常数（ε）和类似于0.009-0.039的非常低的损耗正切（tanδ）。有趣的是，在1060摄氏度下烧结5小时的Ca0.95Sr0.05Cu3Ti4O12 / TiO2陶瓷在-60-210摄氏度的温度范围内，其介电温度系数（Δε）小于+/- 15％，比以前报道的要宽。所有陶瓷样品均显示出非线性J-E特性。 Sr2 +掺杂显着增强了击穿场（E-b）和非线性系数（alpha），在掺有Sr2 +的陶瓷中（x = 0.05），E-b最高，类似于20,548 V.cm（-1），其值类似于52.06。利用X射线衍射（XRD）和场发射扫描电子显微镜（FESEM）研究了Sr2 +掺杂对样品微观结构和相组成的影响。使用X射线吸收近边缘光谱（XANES）研究了陶瓷样品中Cu离子的氧化态。

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