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Title: Perovskite ferroelectric thin films prepared from polymer -modified chemical solution deposition
Authors: YU SHUHUI
Keywords: ferroelectric thin film, PZN-PT, PZMN-PT, polyethylene glycol (PEG), perovskite phase, chemical solution deposition
Issue Date: 24-Feb-2006
Citation: YU SHUHUI (2006-02-24). Perovskite ferroelectric thin films prepared from polymer -modified chemical solution deposition. ScholarBank@NUS Repository.
Abstract: Polyethylene glycol (PEG) modified chemical solution deposition method was employed to prepare perovskite ferroelectric thin films, including Pb(Zr,Ti)O3 (PZT), Pb(Zn1/3Nb2/3)O3-PbTiO3 (PZN-PT) and Pb((Zn,Mg)1/3Nb2/3)O3-PbTiO3 (PZMN-PT). Effects of PEG on the crystal development and properties of the derived films were systematically studied. With the aids of PEG, perovskite phase formed directly from the amorphous gel films at a lower temperature (< 600 oC) and the formation of the pyrochlore phase could be skipped in the PZT, PZN-PT and PZMN-PT films. With addition of PEG in the solutions, the (1-x)PZN-xPT films with x > 0.2 showed single perovskite phase. The perovskite phase was still dominant when x was reduced to 0.1, which is near the morphotropic phase boundary (MPB). Single perovskite phase also formed in the (1-x)PZMN-xPT films with x > 0.1. Dielectric, ferroelectric and piezoelectric properties of the films were characterized and discussed. The mechanism of PEG for promoting the perovskite phase while suppressing the pyrochlore phase was investigatedbased on the analysis on the crystal structures of both phases and the observed change of chemical state of Pb2+ due to its interaction with PEG.
Appears in Collections:Ph.D Theses (Open)

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