Temperature Dependence of Polarization in KTiOPO4 Single Crystals

Abstract

Polarization measurements as a function of temperature are performed on KTP monodomain single crystals, in both, insulating and conducting electrode arrangements. The low temperature study allows to determine the pyroelectric coefficient IK( = 2.97 nC ern-.' K -' which is constant over a wide temperature range. In the case where insulating electrodes are employed it is shown that bulk charge compensation of the spontaneous polarization field occurs around 148 K in the flux-grown samples.Polarisationsmessungen in Abhangigkeit von der Temperatur werden an KTP-Eindomanen-Einkristallen mit isolierenden sowie mit leitenden Elektrodenanordnungen durchgefuhrt. Die Untersuchung bei niedrigen Tcmperaturen ermoglicht den pyroelektrischen Koeffizienten In1 = 2,97 nC ern-' K ' zu bestimmen, der in einem weiten Temperaturbereich konstant ist. Fur den Fall, daB isolierende Elektroden verwendet werdcn, wird gezeigt, daIj die Volurnenladungskompensation des spontanen Polarisationsfeldes bei etwa 148 K in Proben, die mit der FluDwachstumsmethode hergestellt wurden, auftritt.

Optical, vibrational, thermal, electrical, damage, and phase-matching properties of lithium thioindate

“…They measured a pyroelectric coefficient p σ (300K) = 2.6 × 10 −10 C/(cm 2 •K). A more recent and reliable measurement of the pyro-electric coefficient performed with our rose samples yielded a 2.3 times higher value (Table VI), which is 5 times smaller than the value for KTP [96]. In contrast with Negran et al 's report, a strong increase of the pyro-current slightly above room-temperature, preceded by a sharp current spike, was noticed but this increase was attributed to space charge relaxation of the thermally-activated Li + cations [55].…”

New hole configurations in X-irradiated KTiOPO4 Crystals

“…Radiation-induced hole centers are localized, probably, on bridging oxygens and are stabilized by nearest potassium vacancies. All the processes were observed in the temperature range of bulk charge compensation of the spontaneous polarization field [16]. At the temperatures above 148 K (in our case 160 and 220 K) the restricted motion of potassium ions [17] takes place in the crystal.…”

Pyroelectric effect in KTiOPO4and family crystals with monodomain and domain patterned structures

“…Data on the pyroelectric effect in KTP and family crystals are strongly limited and they may be distorted by the high conductivity of these ferroelectrics [12,13]. A linear alteration of P S with temperature, giving a constant value of the pyroelectric coefficient, γ = 2.97 nC cm −2 K −1 was observed for KTP crystals in the range T = 120-206 K [12].…”