Open AccessПотенциальные изображения сегнетоэлектрических доменных структур в кристаллах ниобата лития после формирования электронным лучом
Author(s) -
Л.С. Коханчик
Publication year - 2018
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2018.09.46391.046
Subject(s) - conductivity , polarization (electrochemistry) , lithium niobate , polar , perpendicular , electron , materials science , electric field , annealing (glass) , condensed matter physics , electrical resistivity and conductivity , secondary electrons , electron microscope , chemistry , optics , molecular physics , physics , optoelectronics , geometry , composite material , mathematics , quantum mechanics , astronomy
Ferroelectric domain structures formed by an electron beam in lithium niobate crystals are studied using low-voltage SEM microscopy. The structures are formed in crystals with different conductivity, including samples with high-resistance congruent composition (CLN) and samples with conductivity increased by reductive annealing (RLN). The potential nature of the contrast of the domain structures observed in the secondary electron mode depending on the conductivity of the samples and the direction of spontaneous polarization of the domains is analyzed. It is assumed that the domain contrast in CLN crystals is associated with long-lived charges localized near domain walls and in the irradiated areas. The recorded domain structures in the CLN crystals are visualized on polar and nonpolar cuts. In the RLN crystals with improved conductivity compared to CLN, the potential contrast of the periodic domain structures is found only on the polar cuts, where vector P _ s of the domains is perpendicular to the irradiated surface. This contrast is likely because the field of the spontaneous electric polarization charges influences the secondary electrons.