Calzada, M L*; Algueró, M*; Santos, A*; Stewart, M; Cain, M G; Pardo, L* (2009) Piezoelectric, ferroelectric Pb(Mg1/3Nb2/3)O3-PbTiO thin films with compositions around the morphotropic phase boundary prepared by a sol-gel process of reduced thermal budget. J. Mater. Res., 24 (2). pp. 526-533.

Full text not available from this repository.

Abstract

Single perovskite polycrystalline Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMN-PT) thin films with
PMN to PT ratios around the morphotropic phase boundary composition (070PMN-
0.30PT, 0.65PMN-0.35PT, and 0.60PMN-0.40PT) have been prepared by chemical
solution deposition (CSD). Air-stable and precipitate-free PMN and PT precursor sols
were separately synthesized, and PMN-PT sols were obtained by the simple mixture in air
of the former. The PMN-PT sols were deposited onto Pt-coated Si substrates and dried on
a hot-plate. Crystallization of the films was carried out by rapid thermal processing (RTP)
in oxygen, using different temperatures, soaking times, and heating rates. Single
perovskite PMN-PT thin films were obtained at low temperatures (650 ºC) with short
soaking times (6s) and rapid heating rates (200 ºC/s). The films show a columnar growth
and a uniform thickness. Both the evolution of the perovskite distortion and the electrical
properties with the PMN to PT ratio indicate the correct formation of the solid solution.
The temperature and frequency dependences of the permittivity and the ferroelectric
loops also indicate an increase of the relaxor characteristic of the films as compared with
bulk materials. Piezoelectric coefficients were measured across the ferroelectric loop by
optical interferometry, and an enhancement of piezoelectricity at the MPB composition
was found. A piezoelectric d33 coefficient of ~55 pC/N was measured in ~300-nm-thick
films of this composition with a saturation polarisation of Ps ~25 mC/cm2.

Item Type:	Article
Keywords:	piezoelectric, thin film, ferroelectric
Subjects:	Advanced Materials Advanced Materials > Functional Materials
Last Modified:	02 Feb 2018 13:15
URI:	http://eprintspublications.npl.co.uk/id/eprint/4325

Actions (login required)

View Item