OH vibrational spectrum in Bi2TeO5 single crystals

R. Capelletti, I. Földvári, Á Péter, L. Seravalli

Research output: Contribution to journalConference article

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Abstract

FTIR spectroscopy and linear dichroism measurements (in the range 9-300 K) are applied to the photorefractive Bi2TeO5 single crystals to identify the OH-vibrational absorption, the location and orientation of the OH-defect in the lattice, and its phonon coupling. At 9 K a complex absorption, composed by a main peak at 3471 cm-1 and a shoulder at 3494 cm-1, characterized by a strong dichroism, is attributed to the stretching mode of OH, replacing for an O(4) in the orthorhombic Bi2TeO5 lattice, and mainly aligned along the [100] direction. The anharmonicity (xe to approximately 0.028), put in evidence by the isotopic replica induced by a deuterization process, is discussed in the framework of the Morse model for an anharmonic oscillator.

Original languageEnglish
Pages (from-to)115-119
Number of pages5
JournalRadiation Effects and Defects in Solids
Volume151
Issue number1
DOIs
Publication statusPublished - Jan 1 1999
EventProceedings of the 1998 8th Europhysical Conference on Defects in Insulating Materials, EURODIM 98 - Keele, UK
Duration: Jun 6 1998Jun 11 1998

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ASJC Scopus subject areas

  • Radiation
  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Condensed Matter Physics

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