Growth, etching, polarization and second harmonic generation of potassium lithium tantalate niobate crystals

Dielectric electrooptic gratings in potassium lithium tantalate niobate

“…[8]. In a normal growth process the seed and the growing crystal are rotating in the center of the crucible which contains the flux where the temperature is assumed uniform.…”

Growth and Characterization of Lead-free Piezoelectric Single Crystals

“…We could have chosen Fu et al [4] composition (with x = 0.04) as initial liquid composition, however, according to previous works [9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27], effective segregation coefficients of elements with respect to their molar fractions were either given or can be calculated and have shown a good reliability between them in ternary and quaternary systems containing Li, Na, K, Nb or Ta. Thus, the average segregation coefficients for the considered KNLSTN composition were chosen as follows: k Li = 0.2 [12]; k Na = 1.8 [11,20]; k K = 0.25 [11]; k Nb = 0.75 [17,22,24,27] and k Ta = 3.5 [22,24,27] in order to reach the MPB.…”

Low DC Electric-Field-Induced Phase Transition in KTa0.59Nb0.41O3 Crystal

“…Potassium tantalate niobate, KTa 1– x Nb x O 3 (KTN) crystals, a solid solution of potassium tantalate and potassium niobate, have attracted much attention for their large linear and quadratic electro-optic coefficients, , photorefractive properties, and ferroelectric properties. , The ferroelectric properties and phase evolution of KTN crystals can be controlled by the ratio of Ta/Nb . Recently, the phase transitions including cubic to tetragonal phase, tetragonal to orthorhombic phase, and orthorhombic to rhombohedral phase in perovskite structure crystals have been studied by measuring their relative permittivity, ,− Fröhlich entropy, , and Raman spectrum. , Due to their practical device applications, many efforts are focused on cubic (paraelectric) to tetragonal (ferroelectric) phase transition which occurs at room temperature. − Among these works, the deformation of electric displacement–electric field ( D – E ) hysteresis curve from single curved line to double hysteresis loops, was considered as the indicator of cubic to tetragonal phase transition ( P C–T ) induced by electric field.…”

“…Potassium tantalate niobate, KTa 1−x Nb x O 3 (KTN) crystals, a solid solution of potassium tantalate and potassium niobate, have attracted much attention for their large linear and quadratic electro-optic coefficients, 1,2 photorefractive properties, 3 and ferroelectric properties. 4,5 The ferroelectric properties and phase evolution of KTN crystals can be controlled by the ratio of Ta/Nb. 6 Recently, the phase transitions including cubic to tetragonal phase, tetragonal to orthorhombic phase, and orthorhombic to rhombohedral phase in perovskite structure crystals have been studied by measuring their relative permittivity, 5,7−10 Froḧlich entropy, 8,9 and Raman spectrum.…”