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MgO·nGa2O3 (n = 0.98 – 1.2) Transparent Ceramics with Longer Infrared Cut-Off Edge
W. Tao1,2, D. Han2, J. Zhang2, Y. Shi1, S. Wang2
1 School of Materials Science and Engineering, Shanghai University, Shanghai, 200444, China.
2 State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China.
received May 11, 2024, received in revised form May 20, 2024, accepted May 22, 2024
Vol. 15, No. 2, Pages 89-98 DOI: 10.4416/JCST2024-00009
Abstract
In the pursuit of infrared transparent ceramics derived from MgGa2O4 with an extended infrared cut-off edge, transparent ceramics of magnesium gallate spinel (MgO·nGa2O3) were synthesized by means of solid-state reactive sintering, followed by hot isostatic pressing (HIP) using MgO and Ga2O3 powders as raw materials. This approach yielded novel transparent MgO·nGa2O3 (0.98 ≤ n ≤ 1.2) ceramics, exhibiting an infrared cut-off edge at approximately 7.5 μm. The impact of composition (n) on the phase formation, densification rates, and microstructure evolution was thoroughly investigated. The in-line transmittance of the ceramics (thickness, 1 mm) was over 80 % in the 3 – 5 μm range. Notably, MgO·1.1Ga2O3 ceramics achieved 86.9 % transmittance at 4.6 μm, presenting promising prospects for infrared applications.
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Keywords
Magnesium gallate spinel, transparent ceramics, composition control, reactive sintering, microstructure evolution
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