2004
DOI: 10.1088/0953-8984/16/15/l03
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Diffuse first-order phase transition in NaNbO3:Gd

Abstract: Dielectric permittivity measurements show that (1−x)NaNbO 3 -(x)Gd 1/3 NbO 3 crystals, at x = 0.09, exhibit a first-order phase transition near 150 • C that is diffuse over a wide temperature interval. The area of the ε (T ) thermal hysteresis loop was found to depend both on annealing and cooling temperatures. Optical studies in polarized light show a decrease of the domain sizes at this phase transition. The results obtained are fitted assuming a spatial distribution of Curie temperatures.

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Cited by 15 publications
(16 citation statements)
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“…Material engineering of alkaline niobates like pot assium sodium niobate and lithium sodium niobate with ultralarge piezoresponse comparable to Pb (Zr x Ti 1-x )O 3 (PZT) have evoked considerable interest as the next generation ecofriendly lead free piezoceramics 2,3 required for applications as transducers in cell phones, medical implants, etc. Diffuse scattering and relaxor type behavior in NaNbO 3 based solid solutions have also been recently reported 6,7 . Pure NaNbO 3 has an antiferroelectric (AFE) structure at room temperature and exhibits an unusual complex sequence of temperature and pressure driven structural phase transitions which are not clearly understood.…”
Section: Introductionmentioning
confidence: 80%
“…Material engineering of alkaline niobates like pot assium sodium niobate and lithium sodium niobate with ultralarge piezoresponse comparable to Pb (Zr x Ti 1-x )O 3 (PZT) have evoked considerable interest as the next generation ecofriendly lead free piezoceramics 2,3 required for applications as transducers in cell phones, medical implants, etc. Diffuse scattering and relaxor type behavior in NaNbO 3 based solid solutions have also been recently reported 6,7 . Pure NaNbO 3 has an antiferroelectric (AFE) structure at room temperature and exhibits an unusual complex sequence of temperature and pressure driven structural phase transitions which are not clearly understood.…”
Section: Introductionmentioning
confidence: 80%
“…Due to the random fields and distribution of T c 's, this jump diffuses. 29,30 This can be described by introducing a distribution function f (e,T c ) (see the way how to determine the distribution function from experiment in Ref. 30):…”
Section: Influence Of Random Fields On the Fc Dependence Of Dielecmentioning
confidence: 99%
“…Recently, one more example was found in a solid solution of antiferroelectrics, NaNbO 3 :Gd [5][6][7]. In order to show that the phases coexist at the diffuse phase transition, a special experiment has been performed [6]. This experiment resembles well-known results for the field hysteresis of magnetization in locally disordered magnetic systems studied by Preisah [8].…”
Section: Introductionmentioning
confidence: 78%
“…The main phase transition between the solid and gel states of the lipids is diffuse and the fluctuations are strong [3,4]. Recently, one more example was found in a solid solution of antiferroelectrics, NaNbO 3 :Gd [5][6][7]. In order to show that the phases coexist at the diffuse phase transition, a special experiment has been performed [6].…”
Section: Introductionmentioning
confidence: 99%
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