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Domain Structure of Poled (K 0.50 Na 0.50 ) 1− x Li x NbO 3 Ceramics with Different Stabilities
Author(s) -
Zhang Jialiang,
Tian Xing,
Gao Yong,
Yao Weizeng,
Qin Yalin,
Su Wenbin
Publication year - 2015
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.13358
Subject(s) - tetragonal crystal system , orthorhombic crystal system , materials science , ceramic , natural bond orbital , crystallite , phase (matter) , domain (mathematical analysis) , piezoelectricity , crystallography , mineralogy , crystal structure , physics , chemistry , composite material , mathematics , metallurgy , molecule , mathematical analysis , quantum mechanics
Domain structure of several poled (K 0.50 Na 0.50 ) 1− x Li x NbO 3 ceramics (with chemical compositions of x = 0.03, 0.065, and 0.08, respectively) was investigated by means of observing the domain patterns with an acid‐etching technique. Among the three ceramics, the one with x = 0.03 is of orthorhombic phase and the other two are of tetragonal phase at room temperature. It was found that these ceramics possess distinctly different features of domain patterns and show a large difference in the time‐aging stability of piezoelectric properties. For the ceramic with x = 0.03, domain patterns consist of simply one single set or a few sets of parallel stripes inside the polycrystalline grains. In contrast, for those with x = 0.065 or 0.08, herringbone‐type patterns and a large number of watermarks are additionally observed. Furthermore, the ceramic with x = 0.03 was confirmed to have a much better time‐aging stability of piezoelectric properties than the other two. The results indicate that domain structure is more stable in orthorhombic phase than in tetragonal phase.