Dielectric relaxation in flux grown KTiOPO4 and isomorphic crystals

Abstract

Articles you may be interested inThe dielectric relaxation behavior of (Na0.82K0.18)0.5Bi0.5TiO3 ferroelectric thin film

Growth of high resistivity RbTiOPO4 crystals

“…Above 190 1C, the superionic conduction dominates with an activation energy of 0.50 eV. This is the activation energy for one-dimensional hopping of the Rb + ions to adjacent vacancy sites, and it is in excellent agreement with the literature value of 0.51 eV [16]. At frequencies as high as 20 kHz, or on a short time scale, the Rb + ion can only commit a single jump backwards or forwards, being unrelated to the history of the jump sequence or the concentration of vacancies.…”

“…At frequencies as high as 20 kHz, or on a short time scale, the Rb + ion can only commit a single jump backwards or forwards, being unrelated to the history of the jump sequence or the concentration of vacancies. Therefore, similarly high ac conductivities of the order of 10 À6 S/cm are reported ( [16,17] and this work) independently on the samples used. In contrast, at low frequencies or in the case of dc conductivity, the net Rb + migration distance in the direction of applied electric field is the result of many individual jumps summarized over a long period of time.…”

“…4 show that the temperature dependences of all three samples are practically identical. The slow rise of the ac conductivity between 110 and 190 1C is presumably the residue of a low-temperature conductivity mechanism representing the ''dielectric-superionic conduction'' transition [16]. Above 190 1C, the superionic conduction dominates with an activation energy of 0.50 eV.…”

Structural Reasons for the Nonlinear Optical Properties of KTP Family Single Crystals

“…Physical properties of single crystals grown by top-seeded solution method were studied at the Ariel University Center of Samaria using the technique in [41][42][43]. Physical properties of single crystals grown by spontaneous flux crystallization were studied at the Faculty of Physics of the Moscow State University jointly with the Karpov Institute of Physical Chemistry [33].…”

Кристаллофизическая модель ионного переноса в нелинейно-оптических кристаллах KTiOPO-=SUB=-4-=/SUB=-

“…S/cm при 293 K [3][4][5][6][7][8][9][10]) в зависимо-сти от степени дефектности кристаллической решетки вследствие различных условий их выращивания. Моно-кристаллы KTiOPO 4 , получаемые из раствор-расплава методом Чохральского [11,12] и предназначенные для использования в области нелинейной оптики, харак-теризуются особо низкой концентрацией дефектов и большим электросопротивлением.…”