期刊
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
卷 103, 期 4, 页码 2528-2539出版社
WILEY
DOI: 10.1111/jace.16933
关键词
dielectric properties; lattice vibrational characteristics; microwave dielectric ceramics; olivine type; structure-property relationship
资金
- National Natural Science Foundation of China [11874240]
- Opening Project of Key Laboratory of Inorganic Functional Materials and Devices [KLIFMD201803]
- Natural Science Foundation of Shandong Province [ZR2016EMM21]
- Guangxi Information Materials Key Laboratory Open Research Fund [171007K]
- Scientific Research Foundation of Shandong University of Science and Technology for Recruited Talents [2016RCJJ002]
- State Key Laboratory of New Ceramic and Fine Processing Tsinghua University [KF201811]
LiNiPO4 (LNP) ceramics were synthesized using a conventional solid-state reaction method and different sintering temperatures. Differential scanning calorimetry (DSC), thermogravimetric (TG) analysis, and X-ray diffraction (XRD) measurements indicated that single- phase olivine (Pnma, No. 62) was formed above 750 degrees C, and dense LNP ceramic with a theoretical density of more than 95% was obtained at 825 degrees C. Raman and far-infrared (IR) vibrational modes were assigned and discussed in detail. The intrinsic dielectric properties of the samples were calculated using the four-parameter semi-quantum (FPSQ) model based on far-IR reflectance spectroscopy and were in good agreement with the measured values. A positive relationship existed between the Raman shift of the upsilon(1) mode (attributed to the symmetric vibration of [PO4](3-)) and the corrected permittivity, and the opposite correlation was observed between the quality factor (Q x f) and the damping of the upsilon(s) mode as well as the distortion of the [NiO6] octahedra. The optimized microwave dielectric properties of the LNP ceramics sintered at 825 degrees C include an ultralow dielectric constant (5.18) and a good quality factor (24 076 GHz, f = 17.2 GHz).
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