Kinetic Study on the Sintering Process of Zn1.1Ga1.8Ge0.1O4 Transparent Ceramics
Spinel-type Zn1,Ga1.8Ge0.1O4 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 Zn1.1Ga1.8Ge0.1O4 ceramics were studied.The results show that both densification and grain growth are controlled by the grain boundary diffusion of O2-.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,Zn1.1Ga1.8Ge01O4 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.
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