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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Lanthanum gallium silicate ： ウィキペディア英語版 Lanthanum gallium silicate Lanthanum gallium silicate (referred to as LGS in this article), also known as langasite, has a chemical formula of the form ''A3BC3D2O14'', where ''A'', ''B'', ''C'' and ''D'' indicate particular cation sites. ''A'' is a decahedral (Thomson cube) site coordinated by 8 oxygen atoms. ''B'' is octahedral site coordinated by 6 oxygen atoms, and ''C'' and ''D'' are tetrahedral sites coordinated by 4 oxygen atoms. In this material, lanthanum occupied the ''A''-sites, gallium the ''B'', ''C'' and half of ''D''-sites, and, silicon the other half of ''D''-sites. The crystal structure is shown below: LGS is a piezoelectric material,〔(Polishing and Etching Langasite and Quartz ), Laffey SH and Vig JR, 1994 IEEE International Frequency Control Symposium 〕 with no phase transitions up to its melting point of 1470 °C. Single crystal LGS can be grown via the Czochralski method, in which crystallization is initiated on a rotating seed crystal lowered into the melt followed by pulling from the melt. The growth atmosphere is usually argon or nitrogen with up to 5% of oxygen. The use of oxygen in the growth environment is reported to suppress gallium loss from the melt; however, too high an oxygen level can lead to platinum (crucible material used for the melt) dissolution in the melt. The growth of LGS is primarily along the z direction. Currently the 3-inch (76 mm) langasite boules produced commercially have growth rates of 1.5 to 5 mm/h. The quality of the crystals tends to improve as the growth rate is reduced. ==See also== *Ceramic 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Lanthanum gallium silicate」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.