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Crystalline Structure, Vibrational Spectra and Intrinsic Dielectric Properties of MgO·1.15Ga2O3 Ceramic
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Shiqiao LI, Bin WANG, Pengyu XU, Bingtian TU, Hao WANG
Journal of the Chinese Ceramic Society | 2021, 49(9) : 1935 - 1942
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Journal of the Chinese Ceramic Society | 2021, 49(9): 1935-1942
• Research Article •
Crystalline Structure, Vibrational Spectra and Intrinsic Dielectric Properties of MgO·1.15Ga2O3 Ceramic
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Shiqiao LI, Bin WANG, Pengyu XU, Bingtian TU, Hao WANG
Affiliations
  • State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China

    • LI Shiqiao (1995-), male, Master candidate. E-mail:

About Author:

LI Shiqiao (1995-), male, Master candidate. E-mail:

Published: 2021-09-20 doi: 10.14062/j.issn.0454-5648.20200977
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Magnesium gallate spinel ceramic is a promising candidate material for communication system devices due to its unique microwave dielectric properties. In this work, a pure phase MgO·1.15Ga2O3 ceramic powder with the uniform and fine particle size was synthesized via solid-state reaction. The crystal structure of synthesized powder was determined by X-ray diffraction, showing that the structure is (Mg0.118Ga0.882)IV[Mg0.781Ga1.185□0.033]VIO4. The ceramic was fabricated by pressureless sintering and subsequent hot isostatic pressing sintering with the powder. Furthermore, the correlations among crystal structure, phonon mode parameters and intrinsic dielectric properties were investigated by Raman scattering spectroscopy and Fourier transform far-infrared reflection spectroscopy. The results show that MgO·1.15Ga2O3 ceramic has good microwave dielectric properties (i.e., dielectric constant εr of 13.21 and quality factor Qu×f of 166 THz). Besides, the [Mg—O] polyhedra vibrational group yields a larger contribution to infrared active intensity and dielectric loss rather than other vibration modes. The lattice vibration modes at low frequencies also provide a considerable contribution to intrinsic dielectric loss.

non-stoichiometric magnesium gallate  /  intrinsic dielectric properties  /  crystal structure  /  infrared reflection spectra
李石峤, 王斌, 徐鹏宇, 涂兵田, 王皓. MgO·1.15Ga2O3陶瓷的晶体结构、振动谱及本征介电性能. 硅酸盐学报, 2021 , 49 (9) : 1935 -1942 . DOI: 10.14062/j.issn.0454-5648.20200977
Shiqiao LI, Bin WANG, Pengyu XU, Bingtian TU, Hao WANG. Crystalline Structure, Vibrational Spectra and Intrinsic Dielectric Properties of MgO·1.15Ga2O3 Ceramic[J]. Journal of the Chinese Ceramic Society, 2021 , 49 (9) : 1935 -1942 . DOI: 10.14062/j.issn.0454-5648.20200977
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Year 2021 volume 49 Issue 9
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Article Info
doi: 10.14062/j.issn.0454-5648.20200977
  • Receive Date：2020-12-29
  • Online Date：2026-10-30
  • Published：2021-09-20
Article Data
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History
  • Received：2020-12-29
  • Revised：2021-04-15
Funding
Affiliations
    State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China

Corresponding:

WANG Hao (1969-), male, Ph.D., Professor. E-mail:
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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