[Published online Journal of Computer Chemistry, Japan Vol.16, 129-130, by J-STAGE]
<Title:> 計算機化学を用いたムライト結晶の構造異常の研究
<Author(s):> 鈴木 泰地, 長島 啓, 中嶋 義晴, 内田 希
<Corresponding author E-Mill:> s153242(at)stn.nagaokaut.ac.jp
<Abstract:> Mullite has a complicated crystal structure in which double occupancy of metal atoms and oxygen vacancies take a random arrangement．Various attempts have been made to describe its structure，but it has not yet been fully described．The purpose of this study is to clarify that the random arrangement has regularity. Excluding arbitrariness，the arrangement of metal atoms and oxygen vacancies of mullite crystals of three compositions (1.58Al2O3，1.75Al2O3，1.95Al2O3 for 1SiO2) was randomly generated．Structural relaxation calculations of these models were performed，and their stability was examined．The wide distribution of the heat of formation obtained by the structural relaxation calculation was consistent with the composition．
<Keywords:> mullite, crystal structure, structural relaxation calculation, excluding arbitrariness, random arrangement
<URL:> https://www.jstage.jst.go.jp/article/jccj/16/5/16_2017-0057/_html/-char/ja/
<Title:> 計算機化学を用いたムライト結晶の構造異常の研究
<Author(s):> 鈴木 泰地, 長島 啓, 中嶋 義晴, 内田 希
<Corresponding author E-Mill:> s153242(at)stn.nagaokaut.ac.jp
<Abstract:> Mullite has a complicated crystal structure in which double occupancy of metal atoms and oxygen vacancies take a random arrangement．Various attempts have been made to describe its structure，but it has not yet been fully described．The purpose of this study is to clarify that the random arrangement has regularity. Excluding arbitrariness，the arrangement of metal atoms and oxygen vacancies of mullite crystals of three compositions (1.58Al2O3，1.75Al2O3，1.95Al2O3 for 1SiO2) was randomly generated．Structural relaxation calculations of these models were performed，and their stability was examined．The wide distribution of the heat of formation obtained by the structural relaxation calculation was consistent with the composition．
<Keywords:> mullite, crystal structure, structural relaxation calculation, excluding arbitrariness, random arrangement
<URL:> https://www.jstage.jst.go.jp/article/jccj/16/5/16_2017-0057/_html/-char/ja/
