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MgO·nGa₂O₃ (n = 0.98 – 1.2) Transparent Ceramics with Longer Infrared Cut-Off Edge

W. Tao, W. Tao, D. Han, J. Zhang, Y. Shi, S. Wang

Journal of Ceramic Science and Technology, Vol. 15, No. 2 (2024), pp. 89-98

DOI: 10.4416/JCST2024-00009

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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.

Keywords

Magnesium gallate spinel, transparent ceramics, composition control, reactive sintering, microstructure evolution

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