High-pressure Raman spectroscopy and lattice-dynamics calculations on scintillating MgWO4: Comparison with isomorphic compounds

J. Ruiz-Fuertes, D. Errandonea, S. López-Moreno, J. González, O. Gomis, R. Vilaplana, F. J. Manjón, A. Muñoz, P. Rodríguez-Hernández, A. Friedrich, I. A. Tupitsyna, and L. L. Nagornaya
Phys. Rev. B 83, 214112 – Published 30 June 2011

Abstract

Raman scattering measurements and lattice-dynamics calculations were performed on magnesium tungstate (MgWO4) under high pressure up to 41 GPa. Experiments were carried out on a selection of pressure media. The influence of nonhydrostaticity on the structural properties of MgWO4 and isomorphic compounds is examined. Under quasihydrostatic conditions, a phase transition was found at 26 GPa in MgWO4. The high-pressure phase is tentatively assigned to a triclinic structure similar to that of CuWO4. We also report and discuss the Raman symmetries, frequencies, and pressure coefficients in the low- and high-pressure phases. In addition, the Raman frequencies for different wolframites are compared and the variation of the mode frequency with the reduced mass across the family is investigated. Finally, the accuracy of theoretical calculations is systematically discussed for MgWO4, MnWO4, FeWO4, CoWO4, NiWO4, ZnWO4, and CdWO4.

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  • Received 22 March 2011

DOI:https://doi.org/10.1103/PhysRevB.83.214112

©2011 American Physical Society

Authors & Affiliations

J. Ruiz-Fuertes1,*, D. Errandonea1, S. López-Moreno2, J. González3,4, O. Gomis5, R. Vilaplana5, F. J. Manjón6, A. Muñoz2, P. Rodríguez-Hernández2, A. Friedrich7, I. A. Tupitsyna8, and L. L. Nagornaya8

  • 1Departamento de Física Aplicada-ICMUV, MALTA Consolider Team, Universitat de València, Edificio de Investigación, c/Dr. Moliner 50, 46100 Burjassot, Spain
  • 2Departamento de Física Fundamental II, MALTA Consolider Team, Instituto de Materiales y Nanotecnología, Universidad de La Laguna, La Laguna, 38205 Tenerife, Spain
  • 3DCITIMAC, MALTA Consolider Team, Universidad de Cantabria, Avda. de Los Castros s/n, 39005 Santander, Spain
  • 4Centro de Estudios de Semiconductores, Universidad de los Andes, Mérida 5201, Venezuela
  • 5Centro de Tecnologías Físicas: Acústica, Materiales y Astrofísica, MALTA Consolider Team, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
  • 6Instituto de Diseño para la Fabricación y Producción Automatizada, MALTA Consolider Team, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
  • 7Institut für Geowissenschaften, Abt. Kristallographie, Goethe-Universität Frankfurt, D-60438 Frankfurt am Main, Germany
  • 8Institute for Scintillation Materials, UA-61001 Kharkov, Ukraine

  • *javier.ruiz-fuertes@uv.es.

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Vol. 83, Iss. 21 — 1 June 2011

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