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Goldschmidt's tolerance factor is an indicator for the stability and distortion of crystal structures. It was originally only used to describe perovskite structure, but now tolerance factors are also used for ilmenite. Alternatively the tolerance factor can be used to calculate the compatibility of an ion with a crystal structure. The first description of the tolerance factor for perovskite was made by Victor Moritz Goldschmidt in 1926. == Mathematical expression == The Goldschmidt tolerance factor (t) is a dimensionless number that is calculated from the ratio of the ionic radii:〔 |- | ''rA'' is the radius of the A-cation. || ''rB'' is the radius of the B-cation. || ''r0'' is the radius of the anion (usually oxygen). |} In an ideal cubic perovskite structure the axis of the unit cell (a) can be described with the following equation:〔 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「Goldschmidt tolerance factor」の詳細全文を読む スポンサード リンク
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