Specific features of electrical conductivity of LiTaO3 and LiNbO3 crystals in the temperature range of 290–450 K

Abstract

The electrical conductivity of single crystals of lithium tantalate and lithium niobate of the con gruent composition not subjected to special thermochemical treatments has been investigated in the temper ature range of 290-450 K. It has been shown that the charge transfer mechanisms and carrier types in these crystals are identical in the temperature range under study. The presence of mobility anisotropy of conduction electrons has been revealed and its influence on the recording and storage of optical phase holograms in these crystals has been established.

Features of H-=SUB=-2-=/SUB=-O adsorption on a polar surfaces of LiNbO-=SUB=-3-=/SUB=- crystals

“…The synthesis was carried out by the Czochralski method. The σ z (T ) dependence of specific conductivity on temperature along the z direction was investigated earlier for all samples [11]. The information about samples is given in Table 1.…”

Mechanosynthesis, Structure and Photoluminescent Properties of the Pr3+ Doped LiNbO3, LiNbO3:Mg, LiTaO3 Nanopowders

“…conductivity in single crystalline lithium niobate and lithium tantalate, performed in [29], did not reveal any extreme peculiarities in the temperature range of 290-450 K.…”

“…The literature [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] was reviewed before starting the development and manufacturing of the equipment. These works concerned the preparation and study of ceramics from various niobate and tantalate powders.…”

“…The conductivity of LN:Pr specimen increases linearly in the Arrhenius presentation (see Figure 10), indicating that it is governed by a single thermally activated process. An analysis of the literature suggests that the ionic conduction mechanism with lithium vacancies as a main charge carrier determines the conductivity at elevated temperatures [25,29,[33][34][35][36][37][38]. The lithium vacancy model suggests that compensation of Nb 4…”

“…Therefore, the energy position of the levels, if they were inherent in the compound itself and could participate in conductivity of lithium niobate or lithium tantalate, should also change under the influence of pressure, which is not observed. Moreover, the study of the temperature dependence of the electrical conductivity in single crystalline lithium niobate and lithium tantalate, performed in [29], did not reveal any extreme peculiarities in the temperature range of 290-450 K.…”