Reaction-sintered highly transparent MgGa2O4 ceramics with enhanced dielectric properties

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS Journal of The European Ceramic Society Pub Date : 2024-10-25 DOI:10.1016/j.jeurceramsoc.2024.117024

Guangsheng Tu , Pengyu Xu , Bowen Chen , Ming Yang , Zhengyang Jing , Pan Gao , Bingtian Tu , Hao Wang , Weimin Wang , Zhengyi Fu

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Abstract

Reaction sintering of MgO and Ga₂O₃ powders was first used to prepare MgGa₂O₄ transparent ceramics. The microstructural evolution suggested that the negligible volume change resulting from the solid-phase reaction of MgO and Ga₂O₃, as well as the close and homogeneous arrangement of both fine particles, are the key factors in obtaining pre-sintered ceramics with an ideal microstructure at lower temperature. After a hot isostatic pressing (HIP) treatment, the fully dense ceramic exhibited improved in-transmittance (74.7 %@600 nm, and 85.4 %@4401 nm) and quality factor (Q × f = 168,000 GHz). Due to the combination of high transparency, wide transmission range (6.22 μm at the 60 % transmittance), ultra-low dielectric loss, and near-zero temperature coefficient of resonance frequency (− 3.9 ppm/°C), transparent MgGa₂O₄ ceramic is suggested to be an ideal optical-dielectric integration material.

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具有更强介电特性的反应烧结高透明 MgGa2O4 陶瓷

首先利用氧化镁和氧化镓粉末的反应烧结来制备氧化镓透明陶瓷。微观结构的演变表明，氧化镁和氧化镓固相反应产生的微小体积变化以及两种微粒的紧密和均匀排列是在较低温度下获得具有理想微观结构的预烧结陶瓷的关键因素。经过热等静压（HIP）处理后，全致密陶瓷的透射率（74.7 %@600 nm 和 85.4 %@4401 nm）和品质因数（Q × f = 168,000 GHz）均有所提高。由于透明 MgGa2O4 陶瓷兼具高透明度、宽传输范围（透射率为 60% 时为 6.22 μm）、超低介电损耗和接近零的共振频率温度系数（- 3.9 ppm/°C），因此被认为是一种理想的光电集成材料。

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来源期刊

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.