Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 39, Issue 16, Pages 5350-5357Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2019.08.027
Keywords
Spark plasma sintering; Magnesium aluminate (MgAl(2)O4); Post-annealing treatment; Transparent ceramic; Solid solution spinel
Categories
Funding
- Materials & Components Technology Development (MCTD) Program - Ministry of Trade, Industry & Energy (MOTIE, Korea) [PN: 10047010]
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In MgAl2O4 (Mg aluminate) fabricated by pressure sintering, carbon contamination, oxygen vacancy, and other defects exist and cannot be completely removed even after post-annealing. ZnAl2O4 (Zn aluminate) has the same crystallographic structure as Mg aluminate and excellent light transmission by post-annealing. In this study, the transmission of (Mg1-xZnx)Al2O4 spinel, which is a solid solution between Mg aluminate and Zn aluminate, was investigated. After post-annealing, the transmission of (Mg1-xZnx)Al2O4 spine] was higher than Zn aluminate and Mg aluminate, which means that the absorption center disappeared. Besides, the real in-line transmission is improved by up to 30% by post-annealing, which is related to the driving force to increase the configurational entropy and form a more stable solid solution phase. In solid solution spine], as the Zn content increases, the optical properties can be improved by post-annealing, but the mechanical properties are slightly decreased.
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