Monazite-type SrCrO4 under compression

J. Gleissner, D. Errandonea, A. Segura, J. Pellicer-Porres, M. A. Hakeem, J. E. Proctor, S. V. Raju, R. S. Kumar, P. Rodríguez-Hernández, A. Muñoz, S. Lopez-Moreno, and M. Bettinelli
Phys. Rev. B 94, 134108 – Published 20 October 2016

Abstract

We report a high-pressure study of monoclinic monazite-type SrCrO4 up to 26 GPa. Therein we combined x-ray diffraction, Raman, and optical-absorption measurements with ab initio calculations, to find a pressure-induced structural phase transition of SrCrO4 near 8–9 GPa. Evidence of a second phase transition was observed at 10–13 GPa. The crystal structures of the high-pressure phases were assigned to the tetragonal scheelite-type and monoclinic AgMnO4-type structures. Both transitions produce drastic changes in the electronic band gap and phonon spectrum of SrCrO4. We determined the pressure evolution of the band gap for the low- and high-pressure phases as well as the frequencies and pressure dependencies of the Raman-active modes. In all three phases most Raman modes harden under compression, however the presence of low-frequency modes which gradually soften is also detected. In monazite-type SrCrO4, the band gap blueshifts under compression, but the transition to the scheelite phase causes an abrupt decrease of the band gap in SrCrO4. Calculations showed good agreement with experiments and were used to better understand the experimental results. From x-ray-diffraction studies and calculations we determined the pressure dependence of the unit-cell parameters of the different phases and their ambient-temperature equations of state. The results are compared with the high-pressure behavior of other monazites, in particular PbCrO4. A comparison of the high-pressure behavior of the electronic properties of SrCrO4 (SrWO4) and PbCrO4 (PbWO4) will also be made. Finally, the possible occurrence of a third structural phase transition is discussed.

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  • Received 19 July 2016
  • Revised 26 September 2016

DOI:https://doi.org/10.1103/PhysRevB.94.134108

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

J. Gleissner1,*, D. Errandonea1,†, A. Segura1, J. Pellicer-Porres1, M. A. Hakeem2, J. E. Proctor2, S. V. Raju3, R. S. Kumar4, P. Rodríguez-Hernández5, A. Muñoz5, S. Lopez-Moreno6, and M. Bettinelli7

  • 1Departamento de Física Aplicada-ICMUV, MALTA Consolider Team, Universidad de Valencia, Edificio de Investigación, C/Dr. Moliner 50, Burjassot, 46100 Valencia, Spain
  • 2School of Computing, Science, and Engineering, University of Salford, Manchester M5 4WT, United Kingdom
  • 3CESMEC, Department of Mechanical Engineering, Florida International University, Miami, Florida 33199, USA
  • 4High Pressure Science and Engineering Center, Department of Physics, University of Nevada Las Vegas, Las Vegas, Nevada 89154, USA
  • 5Departamento de Física, Instituto de Materiales y Nanotecnología, and MALTA Consolider Team, Universidad de La Laguna, La Laguna, E-38205 Tenerife, Spain
  • 6Consejo Nacional de Ciencia y Tecnlogia - Centre for Corrosion Research, University of Campeche, Av. Heroe de Nacozari 480, Campeche 24070, Mexico
  • 7Luminescent Materials Laboratory, Department of Biotechnology, University of Verona and INSTM, UdR Verona, Strada Le Gracie 15, 37134 Verona, Italy

  • *ERASMUS student from Imperial College London, London SW7 2AZ, United Kingdom.
  • Author to whom correspondence should be addressed: daniel.errandonea@uv.es

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Issue

Vol. 94, Iss. 13 — 1 October 2016

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