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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Hilczer, A.
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Topics
Publications (3/3 displayed)
- 2007Impossibility of pressure-induced crossover from ferroelectric to nonergodic relaxor state in a Pb (Mg1 3 Nb2 3) 0.7 Ti0.3 O3 crystal: Dielectric spectroscopic studycitations
- 2004High-pressure peculiarities in compositionally ordered Pb(Sc <inf>1/2</inf>Nb<inf>1/2</inf>)O<inf>3</inf>citations
- 2003Effect of hydrostatic pressure on the dielectric response of Pb(Mg 1/3Nb2/3)O3 relaxorcitations
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article
High-pressure peculiarities in compositionally ordered Pb(Sc <inf>1/2</inf>Nb<inf>1/2</inf>)O<inf>3</inf>
Abstract
<p>We report high-pressure dielectric spectroscopy measurements performed on the compositionally highly ordered Pb(Sc<sub>1/2</sub>Nb<sub>1/2</sub>)O <sub>3</sub> ceramic (5 = 0.9), in the pressure range up to 1 GPa. Two anomalies in the dielectric response of the ceramic have been observed: one related to the spontaneous ferroelectric phase transition in the ordered regions of the sample and the second one corresponding to the relaxor behaviour of the material. The p-T phase diagram indicates that pressure decreases linearly the temperatures of both anomalies, but with different slopes. The pressure-induced changes in the amplitude of the relaxor dielectric permittivity peak and activation energy of dipolar fluctuations suggest that different mechanisms leading to relaxor characteristics prevail in the disordered and ordered Pb(Sc<sub>1/2</sub>Nb<sub>1/2</sub>)O<sub>3</sub>. Two contributions arising essentially from the Pb displacements, (i) along (111) and (ii) in planes perpendicular to 〈111〉, have been proposed to explain the high-pressure effects and the coexistence of long- and short-range ferroelectric ordering in the system studied.</p>