Effect of La2O3 on Microstructure and Transmittance of Transparent Alumina Ceramics
来源期刊：JOURNAL OF RARE EARTHS2006年第1期
论文作者：Zhang Hongwei Zeng Zhijiang Yang Qiuhong Xu Jun Ding Jun
Key words：inorganic nonmetallic material; alumina; transparent ceramics; microstructure; La2O3; rare earths;
Abstract: Optically transparent alumina ceramics were fabricated by conventional process and sintered without pressure in H2 atmosphere. The results indicate that relative densities of alumina specimens increase to theoretical densities (T.D.) with increasing content of La2O3. With increasing holding time during sintering, much less pores and larger grains were found in the sintered alumina samples. Higher transmittance was achieved in alumina codoped with MgO and La2O3 as compared with that doped with MgO only. The total-transmittance of alumina sample is up to 86% at a wavelength range of 300～800 nm.
Zhang Hongwei1，Zeng Zhijiang1，Yang Qiuhong1，Xu Jun2，Ding Jun1
(1.School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China;
2.Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China)
Abstract:Optically transparent alumina ceramics were fabricated by conventional process and sintered without pressure in H2 atmosphere. The results indicate that relative densities of alumina specimens increase to theoretical densities (T.D.) with increasing content of La2O3. With increasing holding time during sintering, much less pores and larger grains were found in the sintered alumina samples. Higher transmittance was achieved in alumina codoped with MgO and La2O3 as compared with that doped with MgO only. The total-transmittance of alumina sample is up to 86% at a wavelength range of 300～800 nm.
Key words:inorganic nonmetallic material; alumina; transparent ceramics; microstructure; La2O3; rare earths;
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