In:
Journal of Materials Research, Springer Science and Business Media LLC, Vol. 27, No. 23 ( 2012-12-14), p. 2943-2955
Abstract:
Phase structures and electrical properties of lead-free piezoelectric (1− x )(Bi 0.5 Na 0.5 )TiO 3 – x (K 0.5 Na 0.5 )NbO 3 (BNT– x KNN) ceramics with 0.08 ≤ x ≤ 0.19 were systematically investigated. Results showed that a phase transition from a tetragonal to a pseudocubic phase occurred in this system, as KNN content increases. The addition of KNN shifted both the depolarization temperature T d and rhombohedral–tetragonal phase transition temperature T R-T to lower temperatures and tended to enhance the relaxor behavior of the ceramics, which was well explained by the microdomain–macrodomain transition theory with calculating criterion K . At x = 0.10–0.11, T d reached room temperature (RT), which accordingly induced an enhancement of the unipolar strain that peaks at a value of 0.22% was obtained. Furthermore, as the compositions ( x = 0.12–0.15) have T d below RT, samples exhibited high electrostrictive response with large electrostrictive coefficient Q 33 (0.017–0.019 m 4 /C 2 ) and good thermostability comparable with that of traditional Pb-based electrostrictors.
Type of Medium:
Online Resource
ISSN:
0884-2914
,
2044-5326
DOI:
10.1557/jmr.2012.328
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2012
detail.hit.zdb_id:
54876-5
detail.hit.zdb_id:
2015297-8
