An electret (formed as a portmanteau of electr-from "electricity" and -et from "magnet") is a dielectric material that has a quasi-permanent electrical polarisation. An electret has internal and external electric fields, and is the electrostatic equivalent of a permanent magnet.

駐極体（又稱永電體，英語： Electret ，日语： エレクトレット 或電石）是一种自身帶有電荷的介電材料，且電荷近乎於永久存在於。 驻极体可以只带有单一 电荷 ，也可以带有等量的异号电荷。

An electret is a dielectric material that has a quasi-permanent state of electric polarization. The polarization is linked to either the real electric charges on the surface and/or the volume, or to the oriented dipoles, fixed in the volume [TAB 11]. In the latter case, the material is heated to its fusion or softening temperature and placed in ...

An electret is a dielectric material that has a quasi-permanent electric charge or dipole polarisation (carrying opposite charges on two sides), and that generates internal and external electric fields.

2018年5月16日 · Electret (formed of elektr- from "electricity" and -et from "magnet") is a dielectric material that has a quasi-permanent electric charge or dipole polarization. An electret generates internal...

駐極體（又稱永電體，英語： Electret ，日語： エレクトレット 或電石）是一種自身帶有電荷的介電材料，且電荷近乎於永久存在於。 駐極體可以只帶有單一 電荷 ，也可以帶有等量的異號電荷。

2001年5月1日 · Recent progress in the field of electret research is reviewed. In particular, new developments relating to charge storage and charge transport, piezoelectric electrets with cellular or porous structure, ferroelectric polymers, nonlinear optical polymer electrets, and silicon oxide/nitride electrets are discussed.

2017年8月16日 · A novel flexible electret membrane, exhibiting persistent electrostatic effect, distinctive temperature stability and outstanding capability of resistance to harsh environment and fatigue, is ...

驻极体（electret）又称永电体，是一种极化后能长久保持极化强度的电介质。 它的制备材料较为丰富，有石蜡、硬质橡胶、碳氢化合物、固体酸等许多有机材料和钛酸钡、钛酸钙等一些无机材料。

Electret, material that retains its electric polarization after being subjected to a strong electric field. The positive charge within the material becomes permanently displaced in the direction of the field, and the negative charge becomes permanently displaced in the direction opposite to the