Field coercive

Fig. 1. Hysteresis loop of dielectric displacement, DI, versus appHed electric field where F is coercive field and PI j, PI, and P/ are the saturated,...

As the appHed field is reduced, the iaductioa does aot retrace curve 1 but foUows curve 2 as the domaias at first merely rotate back to the aearest local easy axis directioa. The value of B at i/ = 0 is the remanent iaductioa. At H = which is the coercive-field strength of coercive force or... 

Hysteresis curve of a ferroelectric crystal, v = initial (virginal) curve, Pr = remanent polarization, Ps = spontaneous polarization, Ec = coercive field... 

Pr remanent polarization Ec coercive field. [Reprinted with permission from Ref. 114.]... 

Co(II)Cu(II) 2D molecular-based magnets with large coercive fields, 43 204-205... 

PLZT Compositional System. The solid solution region which forms the basis of the PLZT materials is a series of compositions resulting from the complete miscibility of lead zirconate and lead titanate (commonly designated at PZT) in each other. Modifications to the PZT system by the addition of lanthanum oxide has a marked beneficial effect upon several of the basic properties of the material such as decreased coercive field and increased dielectric constant, electromechcuiical coupling coef-... 

A second type of behavior existing in the PLZT s is the linear (Pockels) effect which is generally found in high coercive field, tetragonal materials (composition 3), This effect is so named because of the linear relationship between An and electric field. The truly linear, nonhysteretic character of this effect has been found to be intrinsic to the material and not due to domain reorientation processes which occur in the quadratic and memory materials. The linear materials possess permanent remanent polarization however, in this case the material is switched to its saturation remanence, and it remains in that state. Optical information is extracted from the ceramic by the action of an electric field which causes linear changes in the birefringence, but in no case is there polarization reversal in the material. 

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