Lattice vibrational characteristics and dielectric properties of pure phase CaTiO3 ceramic
Lattice vibrational characteristics and dielectric properties of pure phase CaTiO3 ceramic
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纯相CaTiO3陶瓷的晶格振动特性和介电性能
DOI：
10.1007/s10854-020-04357-9
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发表时间：
2020-09
期刊：
影响因子：
--
通讯作者：
Jianzhu Li
中科院分区：
文献类型：
--
作者：
Feng Shi;Guang-en Fu;En-Cai Xiao;Jianzhu Li
采用传统的两步烧结法制备了CaTiO_3微波介质陶瓷。Rietveld细化后的X射线衍射谱分析表明，样品为纯相的CaTiO_3。扫描电子显微镜显示样品结晶良好，晶粒尺寸均匀，晶界清晰。用拉曼光谱和红外光谱分析了其晶格振动特性，并结合半量子四参数(FPSQ)模型计算了其本征性质，结果表明低频振动模式对介电性能的贡献最大。此外，介电函数的实部和虚部是从FPSQ模型中提取出来的。用FPSQ模型拟合的本征性质结果与实测值吻合较好。
CaTiO3 microwave dielectric ceramic was fabricated utilizing traditional two-step sintering process. XRD pattern analysis after Rietveld refinement indicated a pure phase CaTiO3 sample. SEM image illustrated well-crystallized sample with uniform grain sizes and clear grain boundaries. The lattice vibrational characteristics were analyzed by Raman and IR spectroscopy, and the intrinsic properties were calculated in conjunction with the semi-quantum four-parameter (FPSQ) model, which turned out that the low-frequency vibrational modes contribute the most to the dielectric properties. Besides, the real and imaginary parts of the dielectric function were drawn from the FPSQ model. The intrinsic property results fitted from the FPSQ model agree well with the measured values.
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