Highly Transparent LiAl5O8 Ceramics Prepared by Spark Plasma Sintering and Its Luminescence

IF 4.2 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of the American Ceramic Society Pub Date : 2026-04-29 DOI:10.1111/jace.70781

Tomáš Thoř, Filip Průša, David Tomka, Vít Jakeš, Romana Kučerková, Martin Nikl, Kateřina Rubešová

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Abstract

Transparent ceramics of LiAl₅O₈ were prepared by spark plasma sintering (SPS) using precursor powders synthesized via solid-state reaction. The effects of sintering dwell time and cooling regime on the microstructure, transparency, and cracking of the sintered ceramics were investigated. The dwell time at the sintering temperature influenced light scattering and consequently also the transparency of the ceramic samples. The two-step cooling regime affected both the microstructure and transparency of the ceramics in addition to playing a critical role in preventing cracking of the samples. By optimizing the dwell time duration and cooling profile, crack-free transparent ceramics with transmittance greater than 80% at 500 nm were achieved. The resulting LiAl₅O₈ transparent ceramics exhibited luminescence originating mainly from Fe³⁺ and Cr³⁺ impurities. Furthermore, strong defect-related emission was also observed under the high-energy X-ray excitation.

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火花等离子烧结制备高透明LiAl5O8陶瓷及其发光性能

利用固相反应合成的前驱体粉末，采用火花等离子烧结（SPS）法制备了LiAl5O8透明陶瓷。研究了烧结时间和冷却方式对烧结陶瓷的显微结构、透明度和开裂性能的影响。烧结温度下的停留时间会影响光散射，从而影响陶瓷样品的透明度。两步冷却制度不仅影响陶瓷的微观结构和透明度，而且在防止样品开裂方面起着关键作用。通过优化停留时间和冷却方式，在500 nm处获得了透射率大于80%的无裂纹透明陶瓷。所得LiAl5O8透明陶瓷的发光主要来源于Fe3+和Cr3+杂质。此外，在高能x射线激发下，还观察到与缺陷相关的强发射。

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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.