In:
Journal of Physics D: Applied Physics, IOP Publishing, Vol. 45, No. 30 ( 2012-08-01), p. 305301-
Abstract:
Bi 0.5 (Na (1 − x ) K x ) 0.5 TiO 3 (BNKT100 x ) ( x = 0.11, 0.13, 0.15, 0.17, 0.19) thin films were deposited on Pt/Ti/SiO 2 /Si(1 0 0) substrates by metal-organic decomposition, and the effects of potassium content on the microstructure and ferroelectric/piezoelectric properties were investigated in detail. The coexistence of typical rhombohedral and tetragonal phases can be identified by multi-peak fitting in grazing incidence x-ray diffraction patterns, which indicates that morphotropic phase boundary (MPB) can be obtained for BNKT100 x thin films. The results show that all the thin films are of single-phase perovskite structure and there is intimate coexistence of two phases in the potassium content range x = 0.13–0.17. The BNKT17 thin film is of the largest effective piezoelectric coefficient ( d 33eff = 98 pm V −1 ), which is attributed to a high degree of alignment of ferroelectric domains in the MPB region and its largest grain size. The BNKT17 thin film exhibits the classical diffuse phase transition of a relaxor ferroelectric, which is discussed by compositional inhomogeneity and polar nanoregions. This study offers useful guidelines to identify MPB of ferroelectric thin films with improved piezoelectric performance.
Type of Medium:
Online Resource
ISSN:
0022-3727
,
1361-6463
DOI:
10.1088/0022-3727/45/30/305301
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
2012
detail.hit.zdb_id:
209221-9
detail.hit.zdb_id:
1472948-9
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