A novel durable spinel-type ZnGa2O4 transparent ceramic with wide transmission range

A novel ZnGa2O4 transparent ceramic was prepared from synthesized single-phase powders by pressureless sintering combined with hot isostatic pressing (HIP) and a post-annealing treatment. The transparent ceramic was fully densified with the average grain size of similar to 3.2 mu m, which possesses outstanding optical properties, including a high in-line transmittance of 82.03% at 2 mu m comparable to its single crystal counterpart (82.52% at 2 mu m) and a wide transmission range (0.27-8.7 mu m). Such an extended infrared transmission range could be attributed to the lower phonon frequency of ZnGa2O4 spinel. This material also exhibits excellent mechanical properties of Vickers hardness (10.56 +/- 0.08 GPa), Young's modulus (227.04 GPa) and fracture toughness (1.83 +/- 0.08 MPa/m(1/2)), as well as high thermal conductivity (19.46 W/m.K) at ambient temperature. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Automated summary

The novel ZnGa2O4 transparent ceramic has excellent optical properties and mechanical properties, as well as high thermal conductivity, with a wide transmission range and high transmittance.