Unstable state in epitaxial films of sodium niobate

Epitaxial perovskite-type films of sodium niobate were grown by pulsed laser deposition, and their crystal structure and dielectric properties were experimentally studied. The dielectric permittivity, inverse permittivity and its derivative, and dielectric hysteresis were analyzed and compared with...

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Bibliographic Details
Published in:Applied physics letters 2009-09, Vol.95 (10), p.102903-102903-3
Main Authors: Tyunina, M., Levoska, J.
Format: Article
Language:English
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Summary:Epitaxial perovskite-type films of sodium niobate were grown by pulsed laser deposition, and their crystal structure and dielectric properties were experimentally studied. The dielectric permittivity, inverse permittivity and its derivative, and dielectric hysteresis were analyzed and compared with those of antiferroelectric lead zirconate films. At temperatures in the interval of 80-600 K, the state of the sodium niobate films with relaxed misfit strain is interpreted as an unstable coexistence of antiferroelectric and ferroelectric phases. The origin of the ferroelectric phase is discussed.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3222900