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The Materials Map is an open tool for improving networking and interdisciplinary exchange within materials research. It enables cross-database search for cooperation and network partners and discovering of the research landscape.

The dashboard provides detailed information about the selected scientist, e.g. publications. The dashboard can be filtered and shows the relationship to co-authors in different diagrams. In addition, a link is provided to find contact information.

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The Materials Map is still under development. In its current state, it is only based on one single data source and, thus, incomplete and contains duplicates. We are working on incorporating new open data sources like ORCID to improve the quality and the timeliness of our data. We will update Materials Map as soon as possible and kindly ask for your patience.

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in Cooperation with on an Cooperation-Score of 37%

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 study11citations
  • 2004High-pressure peculiarities in compositionally ordered Pb(Sc <inf>1/2</inf>Nb<inf>1/2</inf>)O<inf>3</inf>9citations
  • 2003Effect of hydrostatic pressure on the dielectric response of Pb(Mg 1/3Nb2/3)O3 relaxor8citations

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Szafrański, Marek
2 / 23 shared
Ye, Z.-G.
1 / 5 shared
Bokov, A. A.
1 / 3 shared
Nawrocik, Wojciech
2 / 4 shared
Blinc, R.
1 / 6 shared
Czarnecki, Piotr
1 / 18 shared
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2007
2004
2003

Co-Authors (by relevance)

  • Szafrański, Marek
  • Ye, Z.-G.
  • Bokov, A. A.
  • Nawrocik, Wojciech
  • Blinc, R.
  • Czarnecki, Piotr
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article

Impossibility 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 study

  • Szafrański, Marek
  • Ye, Z.-G.
  • Hilczer, A.
  • Bokov, A. A.
Abstract

<p>Relaxor behavior induced by hydrostatic pressure up to 0.95 GPa in the Pb (Mg1 3 Nb2 3) 0.7 Ti0.3 O3 (PMN-30PT) ferroelectric crystal was studied using dielectric spectroscopy. With increasing pressure we observed the decrease of the ferroelectric phase transition temperature (TC), the suppression and smearing of the dielectric anomaly at TC, and the appearance of strong relaxorlike dielectric dispersion below the temperature of the permittivity maximum (Tm). Such kinds of pressure-induced alteration are inherent in compositionally disordered perovskite ferroelectrics. It is usually believed to signify a crossover from the ferroelectric ground state to the nonergodic relaxor ground state in which the dipole moments of polar nanoregions (PNRs) are frozen in a way characteristic of dipole glasses. Surprisingly, our analysis of the dielectric spectra in PMN-30PT at high pressure did not reveal any glassy freezing of dipole dynamics. This means that the nature of the high-pressure-induced ground state is different from the nonergodic relaxor state observed in canonical relaxors at ambient pressure. At T> TC the dielectric spectra measured in PMN-30PT under different pressures are qualitatively similar. They are composed of two contributions that follow the Kohlrausch-Williams-Watts (KWW) and the Curie-von Schweidler (CS) relaxation patterns, respectively. The dielectric susceptibility related to the KWW relaxation provides the major contribution to the total dielectric constant. The shapes of the frequency and temperature dependences of this susceptibility remain practically unaffected by pressure. Contrary to the canonical relaxors the KWW relaxation time does not obey the Vogel-Fulcher law. On the other hand the CS-related susceptibility, which is significant only at low frequencies, considerably increases with increasing pressure and the shapes of its frequency and temperature dependences change radically. At T< TC the KWW and CS relaxation processes are not observed at ambient pressure, but persist at 0.8 GPa. The KWW characteristic relaxation time varies with temperature according to the Arrhenius law. We propose that the observed variation of properties results from the pressure-induced crossover from the sharp order-disorder-type ferroelectric phase transition, which is triggered by the cooperative interactions among dynamic (in the high-temperature phase) PNRs to the diffuse displacive-type ferroelectric transition, which is related to the growth of PNR dimensions. © 2007 The American Physical Society.</p>

Topics
  • perovskite
  • impedance spectroscopy
  • dispersion
  • phase
  • dielectric constant
  • glass
  • glass
  • phase transition
  • susceptibility
  • dielectric dispersion