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Morphotropic Phase Boundary in Solution‐Derived ( Bi 0.5 Na 0.5 ) 1− x Ba x TiO 3 Thin Films: Part II Functional Properties and Phase Stability
Author(s) -
PerezRivero Armando,
Ricote Jesus,
Bretos Inigo,
Calzada M. L.,
Cruz Javier Pérez,
Fernandes Jose R.A.,
Jiménez Ricardo
Publication year - 2014
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12752
Subject(s) - phase boundary , ferroelectricity , phase diagram , polarization (electrochemistry) , materials science , dielectric , analytical chemistry (journal) , mineralogy , phase (matter) , chemistry , optoelectronics , organic chemistry , chromatography
The analysis of the functional properties (ferroelectric, dielectric, and piezoelectric) of chemical solution deposited thin films of the lead‐free ( Bi 0.5 Na 0.5 ) 1− x Ba x TiO 3 ( BNBT ) solid solution prepared from solution precursors with and without Na + and Bi 3+ excesses has been performed in this work. At room temperature a nonergodic relaxor ferroelectric state has been found. The switched polarization of the films is not stable at room temperature, poor remnant polarization, associated with an enhancement of the induced domains randomization produced by the films constraints. The depolarization temperature for the switched polarization allowed us to build up a tentative phase diagram for these BNBT films. Both the better functional properties and the agreement of the depolarization temperature with the freezing temperature of the relaxor Volger–Fulcher behavior permit to locate the center of the morphotropic phase boundary region close to x = 0.055 in the stoichiometric films and x = 0.10 for the films with Na + and Bi 3+ excesses. Based on these results, the possible applications of these films are discussed.