Unstable state in epitaxial films of sodium niobate

Tyunina, M.; Levoska, J.
September 2009
Applied Physics Letters;9/7/2009, Vol. 95 Issue 10, p102903
Academic Journal
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.


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