Document Type

Article

Publication Date

1998

Publication Title

Physical Review B

Volume

58

Issue

5

First Page

2462

Last Page

2466

ISSN

1095-3795

DOI

https://doi.org/10.1103/PhysRevB.58.2462

Abstract

Switching curves were obtained from KH2PO4 single crystals exposed to x-ray radiation for various time intervals, up to 8 h. The applied electric field was varied between 370 and 740 V/cm, as well. The temperature was held constant at 99 K. The switching curves were fit to a three-parameter nucleation and growth model based on the original works by Johnson and Mehl, and independently by Avrami. The two dynamic parameters, characteristic time tc, and effective domain wall dimensionality n, produced values consistent with unirradiated studies, however, they did not show any clear dependancy on exposure time. The switchable polarization P decreased with increasing exposure time. A simple exponential decay is used to describe P as a function of exposure time. The rate coefficient k for the exponential, decreases with increasing electric field.

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