Premium
Solid‐State Synthesis and Properties of Relaxor (1− x )BKT– x BNZ Ceramics
Author(s) -
Wefring Espen T.,
Morozov Maxim I.,
Einarsrud MariAnn,
Grande Tor
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.13066
Subject(s) - tetragonal crystal system , materials science , dielectric , analytical chemistry (journal) , ceramic , phase transition , permittivity , solid solution , crystal structure , x ray crystallography , diffraction , mineralogy , crystallography , condensed matter physics , optics , chemistry , composite material , physics , metallurgy , optoelectronics , chromatography
Conventional solid‐state synthesis was used to synthesize dense and phase pure ceramics in the (1− x ) Bi 0.5 K 0.5 TiO 3 – x Bi 0.5 Na 0.5 ZrO 3 (BKT–BNZ) system. Structural characterization was done using X‐ray diffraction at both room temperature and elevated temperatures, identifying a transition from tetragonal x Bi 0.5 Na 0.5 ZrO 3 ( x BNZ, x = 0–0.10) to pseudo cubic x BNZ for x = 0.15–0.80. Dielectric properties were investigated with respect to both temperature (RT = 600°C) and frequency (1–10 6 Hz). Relaxor‐like behavior was retained for all the materials investigated, evident by the broadening of the relative dielectric permittivity peaks at transition temperatures as well as frequency dispersion at their maximum. The maximum dielectric constant at elevated temperature was found for 0.15 BNZ. Electric field‐induced strain and polarization response were also investigated for several compositions at RT and the largest field‐induced strain was observed for the 0.10 BNZ ceramics. The composition range with best performance coincides with the transition from tetragonal to cubic crystal structure.