Sintering behavior, crystal structures, phonon characteristics and dielectric properties of LiZnPO4 microwave dielectric ceramics
Sintering behavior, crystal structures, phonon characteristics and dielectric properties of LiZnPO4 microwave dielectric ceramics
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LiZnPO4微波介质陶瓷的烧结行为、晶体结构、声子特性和介电性能
DOI：
10.1016/j.matchemphys.2020.124139
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发表时间：
2020-12
影响因子：
4.6
通讯作者：
En-Cai Xiao
中科院分区：
文献类型：
--
作者：
Feng Shi;En-Cai Xiao
采用传统的固相法在不同温度下合成了单相LiZnPO 4（LZP）微波介质陶瓷。对它们的烧结行为、晶体结构、声子特性和介电性能进行了详细的研究，以进一步阐明它们介电响应的物理机制。结果表明，在825 °C下烧结的LZP陶瓷的相对介电常数为5.50，品质因子为47，207（f= 15 GHz）。低于600 cm− 1的拉曼振动模式被归类为外模，其与Li+和Zn 2+离子相关，而高于600 cm− 1的内模与[PO 4]3-四面体的振动相关。根据红外反射光谱，用四参数半量子模型模拟的介电性质与实测值基本一致，说明低频模是影响介电性质的主要因素。介电常数与P-O键长和模式13（[PO 4]3−四面体振动）的拉曼位移成反比。Q × f值与模式13的堆积率和半高宽呈负相关。也就是说，LZP陶瓷的结构和性能之间的半定量关系，成功地建立了烧结温度的函数。
Single phase LiZnPO4(LZP) microwave dielectric ceramics were synthesized via a conventional solid-state ceramic route at different temperatures. Their sintering behavior, crystal structures, phonon characteristics and dielectric properties were studied in detail so as to further expound their physical mechanism of the dielectric respond. The results indicate that the LZP ceramic sintered at 825 °C exhibits a relative dielectric constant of 5.50 and a fine quality factor of 47,207 (f= 15 GHz). Raman vibrational modes below 600 cm−1are classified as the external modes, which are associated with Li+and Zn2+ions, and the internal modes above 600 cm−1are related to the vibration of the [PO4]3-tetrahedron. On the light of the infrared reflection spectrum, the dielectric properties simulated via the four-parameter semi-quantum model are similar to the measured property values, which demonstrate that the modes of low-frequency are the main factors affecting the dielectric properties. The dielectric constant is inversely related to the P–O bond length and the Raman shift of mode 13 ([PO4]3−tetrahedral vibration). TheQ × fvalue owns a negative correlation with packing fraction and full width at half maximum values of modes 13. That is, the semi-quantitative relationships between the structures and the properties of the LZP ceramics were successfully established as a function of the sintering temperature.
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DOI：
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