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Title: High pressure antiferrodistortive phase transition in mixed crystals of EuTiO{sub 3} and SrTiO{sub 3}

Abstract

We report a detailed high pressure study on Eu{sub 1−x}Sr{sub x}TiO{sub 3} polycrystalline samples using synchrotron x-ray diffraction. We have observed a second-order antiferrodistortive phase transition for all doping levels which corresponds to the transition that has been previously explored as a function of temperature. The analysis of the compression mechanism by calculating the lattice parameters, spontaneous strains and tilt angles of the TiO{sub 6} octahedra leads to a high pressure phase diagram for Eu{sub 1−x}Sr{sub x}TiO{sub 3}.

Authors:
 [1];  [2];  [3];  [4]; ;  [5]
  1. Laboratoire Matériaux et Phénoménes Quantiques (UMR 7162 CNRS), Université Paris Diderot-Paris 7, Paris Cedex 13 (France)
  2. (France)
  3. Sapienza University of Rome, Physics Dept., Piazzale Aldo Moro 5, 00185 Roma (Italy)
  4. Department of Physics, National Technical University of Athens, GR-15780 Athens (Greece)
  5. Max-Planck-Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart (Germany)
Publication Date:
OSTI Identifier:
22611526
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 6; Journal Issue: 6; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COMPRESSION; COMPUTERIZED SIMULATION; EUROPIUM COMPOUNDS; LATTICE PARAMETERS; PHASE DIAGRAMS; PHASE TRANSFORMATIONS; POLYCRYSTALS; PRESSURE RANGE MEGA PA 10-100; STRAINS; STRONTIUM TITANATES; SYNCHROTRON RADIATION; TEMPERATURE DEPENDENCE; TITANATES; X-RAY DIFFRACTION

Citation Formats

Parisiades, Paraskevas, E-mail: paraskevas.parisiadis@univ-paris-diderot.fr, ID27 Beamline, European Synchrotron Radiation Facility, 71 Avenue des Martyrs, 38000 Grenoble, Saltarelli, Francesco, Liarokapis, Efthymios, Köhler, Jürgen, and Bussmann-Holder, Annette. High pressure antiferrodistortive phase transition in mixed crystals of EuTiO{sub 3} and SrTiO{sub 3}. United States: N. p., 2016. Web. doi:10.1063/1.4954819.
Parisiades, Paraskevas, E-mail: paraskevas.parisiadis@univ-paris-diderot.fr, ID27 Beamline, European Synchrotron Radiation Facility, 71 Avenue des Martyrs, 38000 Grenoble, Saltarelli, Francesco, Liarokapis, Efthymios, Köhler, Jürgen, & Bussmann-Holder, Annette. High pressure antiferrodistortive phase transition in mixed crystals of EuTiO{sub 3} and SrTiO{sub 3}. United States. doi:10.1063/1.4954819.
Parisiades, Paraskevas, E-mail: paraskevas.parisiadis@univ-paris-diderot.fr, ID27 Beamline, European Synchrotron Radiation Facility, 71 Avenue des Martyrs, 38000 Grenoble, Saltarelli, Francesco, Liarokapis, Efthymios, Köhler, Jürgen, and Bussmann-Holder, Annette. 2016. "High pressure antiferrodistortive phase transition in mixed crystals of EuTiO{sub 3} and SrTiO{sub 3}". United States. doi:10.1063/1.4954819.
@article{osti_22611526,
title = {High pressure antiferrodistortive phase transition in mixed crystals of EuTiO{sub 3} and SrTiO{sub 3}},
author = {Parisiades, Paraskevas, E-mail: paraskevas.parisiadis@univ-paris-diderot.fr and ID27 Beamline, European Synchrotron Radiation Facility, 71 Avenue des Martyrs, 38000 Grenoble and Saltarelli, Francesco and Liarokapis, Efthymios and Köhler, Jürgen and Bussmann-Holder, Annette},
abstractNote = {We report a detailed high pressure study on Eu{sub 1−x}Sr{sub x}TiO{sub 3} polycrystalline samples using synchrotron x-ray diffraction. We have observed a second-order antiferrodistortive phase transition for all doping levels which corresponds to the transition that has been previously explored as a function of temperature. The analysis of the compression mechanism by calculating the lattice parameters, spontaneous strains and tilt angles of the TiO{sub 6} octahedra leads to a high pressure phase diagram for Eu{sub 1−x}Sr{sub x}TiO{sub 3}.},
doi = {10.1063/1.4954819},
journal = {AIP Advances},
number = 6,
volume = 6,
place = {United States},
year = 2016,
month = 6
}
  • We performed the single-crystal X-ray diffraction study of a perovskite-type gold mixed-valence compound, Cs{sub 2}Au{sup I}Au{sup III}Cl{sub 6}, under high pressures up to 18 GPa by using a diamond-anvil-cell with helium gas as an ideal hydrostatic pressure-transmitting medium. The lattice parameters and the variable atomic positional parameters were obtained with reasonable accuracy at various pressures. A structural phase transition at ca. 12.5 GPa from I4/mmm to Pm3m was found. The lattice parameters a {sub 0} and c {sub 0}, denoted in the tetragonal cell setting, result in the relationship 2{sup 1/2} a {sub 0}=c {sub 0}, and the superstructure reflectionsmore » h k l (l is odd), caused by the shift of the Cl ions from the midpoint of the Au ions, disappeared at pressures above the phase transition. Both elongated [Au{sup III}Cl{sub 6}] and compressed [Au{sup I}Cl{sub 6}] octahedra in the low-pressure phase smoothly approach regular octahedra with increasing pressure. Above the structural phase transition at 12.5 GPa, all the [AuCl{sub 6}] octahedra are crystallographically equivalent, which shows that the tetragonal-to-cubic phase transition accompanies the valence transition from the Au{sup I}/Au{sup III} mixed-valence state to the Au{sup II} single-valence state. - Graphical abstract: Single-crystal X-ray diffraction study under high pressures up to 18 GPa by using a diamond-anvil-cell with helium gas as an ideal hydrostatic pressure medium has revealed that a perovskite-type gold mixed-valence compound, Cs{sub 2}Au{sup I}Au{sup III}Cl{sub 6}, exhibits the structural phase transition from tetragonal to cubic at 12.5 GPa accompanying gold valence transition.« less
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