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[求助]
壓電陶瓷的極化強(qiáng)度。
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| 為何壓電陶瓷的極化強(qiáng)度等于其表面電荷密度,如何推導(dǎo)出來的。 |
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?????????????????????????poolarization????????????????????????surface charge density?? ????????????????????r???????w??????O?????s????????r??????????@?????????????????????a???????????????????䶮?@?N?????????a???O????F??Q?顰?????Ч???????????Ч?????|????Cе???D?????????^??? The change in polarization appears as a variation of surface charge density upon the crystal faces, i.e. as a variation of the electrical field extending between the faces, since the units of surface charge density and polarization are the same, [C/m2] = [Cm/m3]. However, piezoelectricity is not caused by a change in charge density on the surface, but by dipole density in the bulk. |
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