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Enhancing the Transparency of Y3Ga5O12 Ceramics via GeO2-Assisted Tailoring of Sintering Kinetics and Microstructure
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DOI：10.1111/jace.70978.png)
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Abstract
En 中文
Transparent Y3Ga5O12 (YGG) ceramics possess promising application prospects in persistent, near-infrared, and mechanical luminescence fields. YGG transparent ceramics were successfully prepared using GeO2 as a sintering additive via air pre-sintering and hot isostatic pressing. At 90% relative density, the densification activation energy increased from 598 to 981 kJ/mol as the GeO2 content rose from 0 to 0.12 wt%. Through the analysis of sintering trajectory and grain boundary mobility, it was revealed that GeO2 effectively inhibited grain growth. The inhibition of densification and grain growth resulted from the decreased oxygen vacancy concentration due to Ge4+ substituting for Ga3+ sites in YGG lattices. YGG transparent ceramic with 0.06 wt% GeO2 exhibited an optimal in-line transmittance of 68.5% at 800 nm, while its optical band gap and refractive index (589 nm) were 3.99 eV and 1.913, respectively. This work offers an effective sintering approach for preparing gallium garnet transparent ceramics.
Keywords:
GeO2
microstructure
sintering kinetics
transparent ceramic
YGG
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