Open AccessВлияние примеси железа на электрическую проводимость кристаллов LiNbO-=SUB=-3-=/SUB=-
Author(s) -
А.В. Яценко,
С.В. Евдокимов
Publication year - 2020
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2020.03.49009.634
Subject(s) - polaron , conductivity , activation energy , impurity , electrical resistivity and conductivity , ion , radius , materials science , doping , electron , analytical chemistry (journal) , condensed matter physics , chemistry , physics , optoelectronics , computer security , organic chemistry , chromatography , quantum mechanics , computer science
The electrical conductivity of a series of LiNbO3 of congruent composition with a relatively low concentration of iron (up to 0.15 wt.% Fe2O3 in the melt) was experimentally studied. It has been established that at temperatures close to 300 K, two types of centers with close activation energies make the main contribution to the electrical conductivity of these crystals. The first type of these centers — Fe2+ ions — is responsible for impurity electron conductivity with an activation energy (0.34 0.01) eV. The second type of these centers is small-radius polarons with an activation energy (0.29 0.02) eV. It was shown that for nominally pure and lightly doped “as grown” LiNbO3 crystals at T = 300 K, polaron conductivity is dominant.