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Modifying Temperature Stability of (K,Na)NbO 3 Ceramics through Phase Boundary
Author(s) -
Lv Xiang,
Wu Jiagang,
Xiao Dingquan,
Zhu Jianguo,
Zhang Junwei,
Zhang Xixiang
Publication year - 2018
Publication title -
advanced electronic materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.25
H-Index - 56
ISSN - 2199-160X
DOI - 10.1002/aelm.201800205
Subject(s) - materials science , orthorhombic crystal system , ceramic , tetragonal crystal system , phase boundary , dielectric , phase (matter) , strain (injury) , natural bond orbital , analytical chemistry (journal) , diffraction , permittivity , condensed matter physics , crystallography , composite material , mineralogy , crystal structure , optics , optoelectronics , density functional theory , chemistry , computational chemistry , physics , organic chemistry , medicine , chromatography
Abstract (0.99‐ x )(K 0.5 Na 0.5 )(Nb 0.965 Sb 0.035 )O 3 ‐0.01SrZrO 3 ‐ x (Bi 0.5 Na 0.5 )ZrO 3 ceramics are chosen as an example to illustrate the effects of phase boundaries on strain. Temperature‐dependent dielectric permittivity and convergent beam electron diffraction patterns confirm the multiphase coexistence of rhombohedral, orthorhombic, and tetragonal phases in the ceramics with x = 0.03–0.04. Intriguingly, the ceramics with x = 0.03 display improved temperature stability in strain, e.g., a high retention (≈95%) of unipolar strain at 180 °C and low variation of 24% at 20–180 °C. A mode is proposed to show how to effectively tailor the strain and consolidate its temperature stability in potassium sodium niobate‐based ceramics.