Abstract
The results of measuring the pyroelectric coefficient γ sσ of nominally perfect KTiOPO4(KTP) crystals grown from solution in a melt with a potassium to phosphorus ratio of ∼2 are presented. The γsσ(T) dependence is monotonie in the range from 4.2 to 250 K. Deviations from a linear dependence are observed beginning from 250 K, which is considered to be due to interstitial-potassium transport in the KTP crystal field. The spontaneous polarization of undamped KTP samples is estimated from the results of the measurements. In terms of the crystal-physics approach, it is shown that the main contribution to a polar state of KTP is made by the dipole moments of two nonequivalent mesoscopic tetrahedra forming two sublattices that are polarized in opposite directions and bound by Ti(1) ions.
Original language | English |
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Pages (from-to) | 912-918 |
Number of pages | 7 |
Journal | Physics of the Solid State |
Volume | 48 |
Issue number | 5 |
DOIs | |
State | Published - May 2006 |