UNSPECIFIED. (2002) Ferroelectric, conductive, and dielectric properties of KTiOPO4 at low temperature. PHYSICAL REVIEW B, 66 (9). -. ISSN 1098-0121

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Abstract

This paper reports the low-temperature dielectric, conducting, and ferroelectric properties of potassium titanyl phosphate, KTiOPO4 (KTP). The change of the dielectric relaxation characteristics as well as the dielectric and conducting properties are related to the decrease of ion hopping frequency with temperature. Between room temperature and 100 K, there are four changes in the behavior of KTP: (i) an increase of K+ activation energy from 0.25+/-0.02 eV to 0.40+/-0.02 eV at 295 K; (ii) a superionic phase transition at similar to170 K, accompanied by an increasing thermal absorption and an abnormal change of the thermal expansion; (iii) a phase transition at 140 K associated with the increase of thermal absorption and spontaneous polarization; (iv) a transition from ionic conduction to electronic conduction, which occurs at a frequency-dependent temperature T-tr = -0.3944f(2)+12.558f+198.59 (f in MHz). The conductivity of KTP shows a strong dependence on the electric field and, as a result of this, ideal ferroelectric hysteresis loops cannot be observed. Despite this, the ionic conductivity decreases with temperature sufficiently to allow KTP to be ferroelectrically switched below 250 K. The coercive field is found to take values from 4.4 to 7.0 kV/mm between 250 K to 180 K, respectively.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Journal or Publication Title:	PHYSICAL REVIEW B
Publisher:	AMERICAN PHYSICAL SOC
ISSN:	1098-0121
Date:	1 September 2002
Volume:	66
Number:	9
Number of Pages:	8
Page Range:	-
Identification Number:	10.1103/PhysRevB.66.094102
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/10509

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