Kinetic Study on the Sintering Process of Zn1.1Ga1.8Ge0.1O4 Transparent Ceramics

Abstract

Abstract: Spinel-type Zn_1.1Ga_1.8Ge_0.1O₄ is an excellent host material for dielectric and long-persistent luminescent ceramics. It is helpful to expand application when the transparent ceramics is fabricated. In this paper, the pressureless sintering kinetics of Zn_1.1Ga_1.8Ge_0.1O₄ ceramics were studied. The results show that both densification and grain growth are controlled by the grain boundary diffusion of O^2-. The activation energy for densification in the intermediate sintering stage is determined as (426±35) kJ/mol, while the activation energy for grain growth in the final sintering stage is calculated as (439±14) kJ/mol. When the combination of sintering parameters is optimized to enter into the so-called “sintering window”, the favorable microstructure of the pressureless-sintered body is obtained. After hot isostatic pressed at high temperature, Zn_1.1Ga_1.8Ge_0.1O₄ transparent ceramics with optical transmission ranging from 0.3 μm to 9 μm and in-line transmittance of 81.2% at 2.5 μm are prepared.

Key words: Zn_1.1Ga_1.8Ge_0.1O₄ spinel, transparent ceramics, sintering path, densification activation energy, grain growth activation energy, optical transparency

CLC Number:

O734

WANG Kaiqiang, YANG Kang, JING Zhengyang, CHEN Bowen, TU Bingtian, WANG Hao. Kinetic Study on the Sintering Process of Zn_1.1Ga_1.8Ge_0.1O₄ Transparent Ceramics[J]. Journal of Synthetic Crystals, 2024, 53(11): 1972-1980.

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Kinetic Study on the Sintering Process of Zn_1.1Ga_1.8Ge_0.1O₄ Transparent Ceramics

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