Kinetics of Phase Transformations in Lead Scandium Tantalate Thin Films

Battat, J.; Huang, Zhaorong; Donohue, Paul P.; Todd, M. A.; Whatmore, R. W.

doi:10.1080/10584580490441692

Cited by 2 publications

(1 citation statement)

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“…It was found that the films deposited at 550 C consist of a pure perovskite phase and no pyrochlore phase was observed in these films. The pyrochlore phase in PST films has been known for degrading the ferroelectric properties 14 and thus it is unwanted. The films deposited at 575 C and 525 C were found to contain a pyrochlore phase emphasizing that phasepure PST films are confined to a rather narrow window of growth temperature.…”

Section: Resultsmentioning

confidence: 99%

Enhanced ferroelectric and dielectric properties of (111)-oriented highly cation-ordered PbSc0.5Ta0.5O3 thin films

Chopra

Birajdar

Kim

et al. 2013

Journal of Applied Physics

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Cation-ordered (111)-oriented epitaxial PbSc 0.5 Ta 0.5 O 3 (PST) thin films were deposited by pulsed laser deposition on SrRuO 3-electroded SrTiO 3 (111) substrates at three different temperatures of 525 C, 550 C, and 575 C. All the films were well crystalline and (111)-oriented at all the three growth temperatures; however, the films deposited at the temperatures other than 550 C exhibited the presence of a pyrochlore phase. X-ray diffraction analysis and transmission electron microscopy measurements revealed that the films were epitaxial and highly cation-ordered. In comparison to (001)-oriented PST films, (111)-oriented films on SrRuO 3 /SrTiO 3 (111) exhibited enhanced ferroelectric and dielectric properties with a broad size distribution of cation-ordered domains (5-100 nm). At a measurement temperature of 100 K, the remnant polarization of PST (111) films is almost ͱ3 times larger than the remnant polarization observed for (001)-oriented PST films, which is attributed to the (111) orientation of the films, as the spontaneous polarization in PST lies close to the [111] direction. The observed dielectric constant and loss at 1 kHz were around 1145 and 0.11, respectively. The dielectric constant is thus almost three times higher than for previously reported (001)-oriented PST thin films, most probably due to the enhancement in cation-ordering. V

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Section: Resultsmentioning

confidence: 99%