Crystal structure characteristics, intrinsic properties, and vibrational spectra of non-stoichiometric Ca1+xWO4 ceramics
Crystal structure characteristics, intrinsic properties, and vibrational spectra of non-stoichiometric Ca1+xWO4 ceramics
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DOI：
10.1063/1.5044499
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发表时间：
2018-07
影响因子：
3.2
通讯作者：
Jianzhu Li;Jing Wang;Guang-en Fu;Chao Xing;Xunqian Yin;Hengyang Qiao;Huiling Chen;Z. Qi
中科院分区：
文献类型：
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作者：
Jianzhu Li;Jing Wang;Guang-en Fu;Chao Xing;Xunqian Yin;Hengyang Qiao;Huiling Chen;Z. Qi
采用常规固相法测定了非化学计量Ca1+xWO4陶瓷的组成范围为-0.04≤x≤0.04。 X射线衍射图谱显示主相为四方白钨矿结构。扫描电子显微镜图像显示出致密且均匀的晶粒。振动模式被指定并特别说明。 Bg(Ca)拉曼模式的半高全宽与根据阻尼因子模拟的固有损耗之间存在正相关关系，ν4(Bg)模式的拉曼位移与克劳修斯-莫索蒂(C-M)方程计算的介电常数之间存在负相关关系。通过基于远红外反射率光谱的四参数半量子（FPSQ）模型计算了样品的内在性质，与C-M和阻尼方程得到的值非常吻合。当 x = -0.01 时，在 1150 °C 下烧结的 Ca0.99WO4 陶瓷具有 er = ...
Non-stoichiometric Ca1+xWO4 ceramics were determined in a composition range of −0.04 ≤ x ≤ 0.04 by a conventional solid-state method. X-ray diffraction patterns show that the main phase is a tetragonal scheelite structure. Scanning electron microscopy images exhibited dense and uniform grains. The vibrational modes were assigned and illustrated in particular. A positive correlation exists between the full-width at half-maximum values of the Bg(Ca) Raman modes and the intrinsic losses simulated according to the damping factor and also a negative correlation between the Raman shifts of the ν4 (Bg) modes and the dielectric constants calculated by the Clausius-Mossotti (C-M) equation. The intrinsic properties of the samples were calculated by the four-parameter semi-quantum (FPSQ) model based on the far-infrared reflectivity spectra, which agreed well with those values obtained by the C-M and damping equations. At x = −0.01, the Ca0.99WO4 ceramic sintered at 1150 °C possesses the intrinsic properties of er = ...