Diffuse first-order phase transition in NaNbO$_3$:Gd (a report)

Details Diffuse first-order phase transition in NaNbO$_3$:Gd (a report) Diffuse first-order phase transition in NaNbO$_3$:Gd (a report)

2004-01-05

arxiv.org/abs/cond-mat/0401040v1

Physics

Condensed Matter

Materials Science

2 pages, 3 figures, Fundamental Physics of Ferroelectrics, Williamsburg 2004

Scientific paper

Dielectric permittivity measurements show that (1-x)NaNbO3-(x)Gd1/3NbO3 crystals, at $x=0.09$, exhibit a first order phase transition near 150 C which is diffuse over a wide temperature interval. The area of the \epsilon(T) thermal hysteresis loop was found to depend both on the annealing and cooling temperatures. Optical studies in polarized light show the decrease of the domains sizes at this phase transition. The results obtained are fitted assuming the space distribution of Curie temperatures.

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