Electrostriction

Japanese: 電歪 - でんわい（英語表記）electrostriction

The phenomenon of mechanical distortion and deformation caused by ionic polarization when an electric field is applied to a dielectric material. It is also called electrostriction. It is similar to the inverse piezoelectric effect exhibited by piezoelectric materials, but differs in that the magnitude of distortion in electrostriction is proportional to the square of the electric field, whereas in the inverse piezoelectric effect it is proportional to the electric field. However, this narrow definition of electrostriction and the inverse piezoelectric effect are sometimes collectively called electrostriction. Electrostriction is evident in ferroelectric materials, but if the remanent polarization is used as a bias electric field, it becomes exactly the same as a piezoelectric material, so it is used in electromechanical conversion. (→ Electrostrictive vibrator)

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

誘電体に電界をかけたとき，イオン分極に伴って機械的にひずみを生じる現象およびその変形。電気ひずみともいう。圧電体の示す逆圧電効果に似ているが，電歪ではひずみの大きさが電界の2乗に比例し，逆圧電効果はそれが電界に比例する点で異なっている。ただし，この狭義の電歪と逆圧電効果をあわせて電歪と呼ぶこともある。強誘電体では電歪が顕著に現れるが，残留分極をバイアス電界として利用すれば圧電体とまったく同等になるので電気機械変換に応用される。 (→電歪振動子 )

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