%0 Journal Article
%T γ-LiAlO2 Single Crystal Grown by Czochralski Technique and Modified by Vapor Transport Equilibration (VTE) Technique
%A Jun
%A ZOU
%A Lianhan
%A ZHANG
%A Jun
%A XU
%A Shengming
%A ZHOU
%J 材料科学技术学报
%D 2006
%I 
%X Large-sized （～2 inch, 50.8 mm） γ-LiAlO2 single crystal has been grown by conventional Czochralski （Cz） method, but the crystal has a milky, dendriform center. The samples taken from transparent and milky parts were ground and examined by X-ray diffraction. All diffraction peaks could be indexed in γ-LiAlO2. The crystal quality was characterized by X-ray rocking curve. The full-width at half-maximum （FWHM） values are 116.9 and 132.0 arcsec for transparent and milky parts, respectively. The vapor transport equilibrium （VTE） technique was introduced to modify the crystal quality. After 1000℃/48 h, 1100℃/48 h, 1200℃/48 h VTE processes, the FWHM values dropped to 44.2 and 55.2 arcsec for transparent and milky part, respectively. The optical transmission of transparent part was greatly enhanced from 85% to 90%, and transmission of milky part from 75% to 80% in the range of 190~1900 nm at room temperature. When the VTE temperature was raised to 1300℃, the sample cracked and FWHM values of transparent and milky parts were increased to 55.2 and 80.9 arcsec, respectively. By combining Cz technique with VTE technique, large-sized and high quality γ-LiAlO2 crystal can be obtained.
%K γ-LiAlO2
%K 铝酸锂单晶
%K 晶粒生长
%K 水汽输送技术
%K 塞泽若尔斯技术
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=84529CA2B2E519AC&jid=324DC3CAB22330DB19158AE0A9B7BFA5&aid=CB849B9FE3572973197E8B075D2B70A5&yid=37904DC365DD7266&vid=BC12EA701C895178&iid=E158A972A605785F&sid=ABF2590617D31FFD&eid=3F419E61BD389CC8&journal_id=1005-0302&journal_name=材料科学技术学报&referenced_num=0&reference_num=0