Polar Crystals

Japanese: 極性結晶 - きょくせいけっしょう
Polar Crystals

…Polarization when the external electric field is zero is called spontaneous polarization, and when a crystal belongs to one of the 11 polar point groups, the crystal has spontaneous polarization. A crystal that has spontaneous polarization is called a polar crystal. The value of spontaneous polarization is generally a function of temperature, so when the temperature of a polar crystal is changed, pairs of positive and negative charges appear at both ends of the crystal according to the change in the value of spontaneous polarization. …

*Some of the terminology that mentions "polar crystals" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…外部電場が0のときの分極を自発分極といい,結晶が11の極性点群のいずれかに属するとき,その結晶は自発分極をもつ。自発分極をもつ結晶を極性結晶という。自発分極の値は一般に温度の関数であるから,極性結晶の温度を変化させると,自発分極の値の変化に応じて,結晶の両端に正,負の電荷が対になって現れる。…

※「極性結晶」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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