Influence of germanium concentration on the microstructure and optical transparency of terbium gallium garnet ceramics

IF 3.5 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS Journal of the American Ceramic Society Pub Date : 2024-09-17 DOI:10.1111/jace.20140

Xiao Li, Lixuan Zhang, Danyang Zhu, Junlin Wu, Chen Hu, Tingsong Li, Lexiang Wu, Dariusz Hreniak, Jiang Li

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Abstract

In recent years, transparent terbium gallium garnet (TGG) ceramics have garnered significant interest for their application in high‐power Faraday isolators. However, challenges in achieving high transparency have led researchers to explore the addition of various sintering aids as a key strategy to enhance the optical quality of TGG ceramics. Through this work, the effect of germanium (Ge) addition on the microstructure and optical transparency of TGG magneto‐optical ceramics was investigated. TGG powders were synthesized by the co‐precipitation method, and the source Ge was Ge ethoxide added through a ball‐milling step. Transparent TGG ceramics were prepared by air pre‐sintering combined with hot isostatic pressing post‐treatment and subsequent annealing. The ceramics containing 200 ppm Ge exhibit optimal transmittance of 81.3% at 1064 nm (a value of theoretical transmittance), the Verdet constant was −133.0 rad·T−1·m−1 at 633 nm. When the addition of Ge reaches 600 ppm, a secondary phase can be observed on the surface of ceramic. Subsequently, TGG ceramics prepared from 1425°C to 1500°C with 200 ppm of Ge were analyzed, which revealed that the optimal pre‐sintering temperature is 1450°C.

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锗浓度对铽镓石榴石陶瓷微观结构和光学透明度的影响

近年来，透明铽镓石榴石（TGG）陶瓷因其在大功率法拉第隔离器中的应用而备受关注。然而，实现高透明度所面临的挑战促使研究人员探索添加各种烧结助剂作为提高 TGG 陶瓷光学质量的关键策略。通过这项工作，研究了添加锗（Ge）对 TGG 磁光陶瓷微观结构和光学透明度的影响。TGG 粉末采用共沉淀法合成，锗源为通过球磨步骤添加的乙氧化锗。通过空气预烧结、热等静压后处理和随后的退火制备了透明的 TGG 陶瓷。含 200 ppm Ge 的陶瓷在 1064 纳米波长下的最佳透射率为 81.3%（理论透射率值），在 633 纳米波长下的 Verdet 常数为 -133.0 rad-T-1-m-1。当 Ge 的添加量达到 600 ppm 时，可在陶瓷表面观察到第二相。随后，分析了在 1425°C 至 1500°C 温度范围内使用 200 ppm Ge 制备的 TGG 陶瓷，结果表明最佳预烧结温度为 1450°C。

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来源期刊

Journal of the American Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

7.50

自引率

7.70%

发文量

590

审稿时长

2.1 months

期刊介绍： The Journal of the American Ceramic Society contains records of original research that provide insight into or describe the science of ceramic and glass materials and composites based on ceramics and glasses. These papers include reports on discovery, characterization, and analysis of new inorganic, non-metallic materials; synthesis methods; phase relationships; processing approaches; microstructure-property relationships; and functionalities. Of great interest are works that support understanding founded on fundamental principles using experimental, theoretical, or computational methods or combinations of those approaches. All the published papers must be of enduring value and relevant to the science of ceramics and glasses or composites based on those materials. Papers on fundamental ceramic and glass science are welcome including those in the following areas: Enabling materials for grand challenges[...] Materials design, selection, synthesis and processing methods[...] Characterization of compositions, structures, defects, and properties along with new methods [...] Mechanisms, Theory, Modeling, and Simulation[...] JACerS accepts submissions of full-length Articles reporting original research, in-depth Feature Articles, Reviews of the state-of-the-art with compelling analysis, and Rapid Communications which are short papers with sufficient novelty or impact to justify swift publication.