Phonon characteristics and intrinsic properties of phase-pure CaMoO4 microwave dielectric ceramic

Phonon characteristics and intrinsic properties of phase-pure CaMoO4 microwave dielectric ceramic
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纯相CaMoO4微波介质陶瓷的声子特性和本征性能

DOI:
10.1007/s10854-020-03135-x
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发表时间:
2020-02
期刊:
Journal of Materials Science: Materials in Electronics
影响因子:
--
通讯作者:
Shi Feng
Shi Feng
中科院分区:
其他
文献类型:
--
作者:
Xiao En-Cai;Ren Qi;Cao Zhikai;Dou Gang;Qi Ze-Ming;Shi Feng

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采用传统固相反应法在1150 ℃下烧结4 h制备了纯相CaMoO 4微波介质陶瓷,XRD分析表明其为四方白钨矿结构,空间群为I4(1)/a。基于Lorentz函数、四参数半量子模型和Kramers-Kronig变换,研究了纯相CaMoO 4的拉曼散射和红外光谱,揭示了CaMoO 4的局域结构和本征性质.拉曼光谱的外模是Ca ~(2+)离子相对于刚性[MoO_4](2-)四面体的振动,内模对应于[MoO_4](2-)内部的振动。红外光谱拟合结果表明,样品的介电特性与实验结果基本一致,介电响应的主要贡献来源于E-u模,即,CaMoO 4陶瓷中Ca-O键的平移振动。
Phase-pure CaMoO4 microwave dielectric ceramic was sintered at 1150 celcius for 4 h via a conventional solid-state reaction method, which was indicated as a tetragonal scheelite structure (space group I4(1)/a) by XRD analysis. Raman scattering and infrared spectra of the phase-pure CaMoO4 were investigated based on Lorentz function, four-parameter semiquantum model and Kramers-Kronig transformation to reveal the local structure and intrinsic properties. External modes of Raman spectrum are vibration of Ca2+ ions relative to the rigid [MoO4](2-) tetrahedron, internal modes corresponded to vibration inside [MoO4](2-). Fitting infrared spectrum show that the dielectric properties are similar to the experimental results and the main source of contribution to dielectric response comes from E-u modes, i.e., translational vibration of Ca-O bonds in the CaMoO4 ceramic.
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