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Title: Structure and properties of (1-x)(0.6Pb(Zn1/3Nb 2/3)O3-0.4Pb (Mg1/3Nb2/3)O 3)-xPbTiO3 thin films with perovskite phase promoted by polyethylene glycol
Authors: Yu, S.
Yao, K.
Tay, F.E.H. 
Keywords: Ferroelectric thin film
Polyethylene glycol
Issue Date: Jun-2007
Citation: Yu, S., Yao, K., Tay, F.E.H. (2007-06). Structure and properties of (1-x)(0.6Pb(Zn1/3Nb 2/3)O3-0.4Pb (Mg1/3Nb2/3)O 3)-xPbTiO3 thin films with perovskite phase promoted by polyethylene glycol. Journal of Sol-Gel Science and Technology 42 (3) : 357-364. ScholarBank@NUS Repository.
Abstract: The preferential formation of a pyrochlore structure is a knotty problem in the preparation of Pb(Zn1/3Nb2/3)O3 (PZN)-based thin film materials and its presence is significantly detrimental to the dielectric and piezoelectric properties. In this study, 40 mol% of PZN was replaced with Pb(Mg1/3Nb2/3)O3 (PMN) for obtaining a perovskite composition around a morphotropic phase boundary (MPB), (1-x)(0.6PZN-0.4PMN)-xPT ((1-x)PZMN-xPT, PT: PbTiO3) where x = 0.23. The thin films with this composition were prepared with a polyethylene glycol (PEG) modi-fied sol-gel method on LaAlO3 substrates. The microstructural evolution of the films on heat treatment was examined with X-ray diffraction. With the aid of PEG, the formation of the pyrochlore phase was suppressed and the perovskite phase formed directly from the amorphous gel film. The multilayer films with a thickness around 0.25 μm showed a single perovskite phase without any detectable pyrochlore structure. Microscopic images showed uniform grain size of a few tens of nanometers. The role of the polymer dramatically promoting the perovskite phase was investigated with the aid of X-ray photoelectron spectroscopy and thermal analysis. The dielectric constant of the obtained film was 4160 at 1 kHz. The film demonstrated typical ferroelectric hysteresis loops and exhibited excellent piezoelectric performance. © Springer Science + Business Media, LLC 2007.
Source Title: Journal of Sol-Gel Science and Technology
ISSN: 09280707
DOI: 10.1007/s10971-007-0744-6
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