反転中心

inversion center

[目次：結晶等(結晶構造／材料試料)]

結晶点群の対称要素のひとつ。座標(x, y, z)にある点を座標(-x, -y, -z)に移す操作を反転操作という。結晶にこの操作を行ったときに操作前の結晶と一致するとき、この操作を行う点を反転中心という。

A symmetry element of the crystallographic point group. An operation that transforms a coordinate (x, y, z) into (-x, -y, -z) (that is, the signs of the coordinates of each point are changed) is called the inversion operation. When this symmetry is operated for a crystal, the crystal can be equivalent to that before the operation. In this case, the point leaving fixed by the operation is called "inversion center."

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