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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 Gadolinium(III) oxide ： ウィキペディア英語版 Gadolinium(III) oxide |Section2= |Section3= |Section7= |Section8= }} Gadolinium(III) oxide (archaically gadolinia) is an inorganic compound with the formula Gd2O3. It is one of the most commonly available forms of the rare earth element gadolinium, derivatives of which are potential contrast agents for magnetic resonance imaging. == Structure == Gadolinium oxide adopts two structures. The cubic (cI80, Ia), No. 206) structure is similar to that of manganese(III) oxide. The cubic structure features two types of gadolinium sites, each with a coordination number of 6 but with different coordination geometries. The second polymorph is monoclinic (Pearson symbol mS30, space group C2/m, No. 12).〔Wells A.F. (1984) ''Structural Inorganic Chemistry'' 5th edition Oxford Science Publications. ISBN 0-19-855370-6.〕 At room temperature, the cubic structure is more stable. The phase change to the monoclinic structure takes place at 1200 °C. Above 2100 °C to the melting point at 2420 °C, a hexagonal phase dominates. 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「Gadolinium(III) oxide」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.