Open AccessIN SITU TEM STUDIES OF FERROELECTRIC PHASE TRANSITIONS IN Ba2NaNb5O15 AND LiTaO3
Author(s) -
Hu Meisheng,
D. L. Feng
Publication year - 1982
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.31.815
Subject(s) - phase transition , ferroelectricity , materials science , in situ , phase (matter) , condensed matter physics , lithium tantalate , radiation , angstrom , chemical physics , optics , crystallography , physics , chemistry , optoelectronics , dielectric , quantum mechanics , meteorology , lithium niobate
In this paper we presented our experimental results of in situ TEM observations of ferroelectric phase transitions in BaBa2NaNb5O15 (Tc =550℃) and LiTaO3 (TC = 660℃). At room temperature the domain patterns are of the scale 0.2-1 μm. Increasing the temperature to near Tc, the micro-domains forming quasi-regular arrays of the scale about several hundreds of angstroms have been observed and interpreted according to a model slightly modified from that of Селок. A strong susceptibility to radiation damage is found in LiTaO3 near phase transition temperature which may be connected with soft modes of phase transitions.