Fabrication of YAG transparent ceramics using carbonate precipitated yttria powder. Issue 8 (August 2015)

• Record Type: Journal Article
• Authors: Liu, Binglong; Li, Jiang; Yavetskiy, Roman; Ivanov, Maxim; Zeng, Yanping; Xie, Tengfei; Kou, Huamin; Zhuo, Shangjun; Pan, Yubai; Guo, Jingkun
• Is Part Of: Journal of the European Ceramic Society. Volume 35:Issue 8(2015:Aug.)
• Page Start: 2379
• Page End: 2390
• Publication Date: 2015-08
• Subjects: Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2015.02.014
• Languages: English
• ISSNs: 0955-2219

Abstract

<abstract abstract-type="author" id="abs0005"> <title id="sect0005">Abstract</title> <sec> <p id="spar0005">Well-dispersed yttria nanopowders were synthesized by a precipitation method from yttrium nitrate solution using ammonium hydrogen carbonate as a precipitant. Needle-like precursor Y₂(CO₃)₃·2.79 H₂O undergoes fragmentation and decomposition into isolated quasi-spherical Y₂O₃ particles upon calcination in air. Highly transparent YAG ceramics were fabricated from the as-synthesized Y₂O₃ powder and the commercial α-Al₂O₃ powder by vacuum sintering. Phase transformation, morphology evolution, and sinterability of Y₂O₃ powders, microstructure and optical properties of YAG ceramics were investigated in detail. The densification, grain growth, linear shrinkage and phase transformation of the as-sintered ceramics were also explored. The activation energy for grain growth in the ceramic sample is 881 kJ/mol. With optimized preparation conditions, YAG ceramics with the average grain size of about 20 μm were fabricated by sintering at 1780 °C for 20 h, whose in-line transmittance reached 83.7% and 80.3% at the wavelength of 1064 nm and 400 nm, respectively.</p> </sec> </abstract>