Raman scattering studies of the Ba2MnWO6 and Sr 2MnWO6 double perovskites

Yukari Fujioka; Johannes Frantti; Masato Kakihana

doi:10.1021/jp054861b

Raman scattering studies of the Ba₂MnWO₆ and Sr ₂MnWO₆ double perovskites

Yukari Fujioka, Johannes Frantti, Masato Kakihana

Research output: Contribution to journal › Article › peer-review

28 Citations (Scopus)

Abstract

Polycrystalline Ba₂MnWO₆ (BMW) and Sr ₂MnWO₆ (SMW) samples were studied between 80 and 1200 K by Raman scattering spectroscopy. In the case of BMW (space group Fm3̄m), four Raman active vibrational modes, predicted by factor group analysis, were identified. Raman scattering studies with different wavelengths revealed a resonant bands between 300 and 800 cm^-1. The origin of these bands was related to the Franck-Condon process. Line broadening versus temperature and phonon frequency were studied, and a qualitative explanation was proposed. SMW samples had considerably more complex Raman spectra. It was found that SMW transformed from tetragonal (room-temperature space group P4₂/n) to the cubic phase between 670 and 690 K; the phase transition temperature was dependent on sample preparation conditions, and it was considerably lower than in the case of large grain size powders. The role of grain size in phase transition is discussed. Mn ions were found to have a crucial role in the lattice dynamics of both materials.

Original language	English
Pages (from-to)	777-783
Number of pages	7
Journal	Journal of Physical Chemistry B
Volume	110
Issue number	2
DOIs	https://doi.org/10.1021/jp054861b
Publication status	Published - 2006 Jan 19

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Surfaces, Coatings and Films
Materials Chemistry

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title = "Raman scattering studies of the Ba2MnWO6 and Sr 2MnWO6 double perovskites",

abstract = "Polycrystalline Ba2MnWO6 (BMW) and Sr 2MnWO6 (SMW) samples were studied between 80 and 1200 K by Raman scattering spectroscopy. In the case of BMW (space group Fm{\=3}m), four Raman active vibrational modes, predicted by factor group analysis, were identified. Raman scattering studies with different wavelengths revealed a resonant bands between 300 and 800 cm-1. The origin of these bands was related to the Franck-Condon process. Line broadening versus temperature and phonon frequency were studied, and a qualitative explanation was proposed. SMW samples had considerably more complex Raman spectra. It was found that SMW transformed from tetragonal (room-temperature space group P42/n) to the cubic phase between 670 and 690 K; the phase transition temperature was dependent on sample preparation conditions, and it was considerably lower than in the case of large grain size powders. The role of grain size in phase transition is discussed. Mn ions were found to have a crucial role in the lattice dynamics of both materials.",

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T1 - Raman scattering studies of the Ba2MnWO6 and Sr 2MnWO6 double perovskites

AU - Fujioka, Yukari

AU - Frantti, Johannes

AU - Kakihana, Masato

PY - 2006/1/19

Y1 - 2006/1/19

N2 - Polycrystalline Ba2MnWO6 (BMW) and Sr 2MnWO6 (SMW) samples were studied between 80 and 1200 K by Raman scattering spectroscopy. In the case of BMW (space group Fm3̄m), four Raman active vibrational modes, predicted by factor group analysis, were identified. Raman scattering studies with different wavelengths revealed a resonant bands between 300 and 800 cm-1. The origin of these bands was related to the Franck-Condon process. Line broadening versus temperature and phonon frequency were studied, and a qualitative explanation was proposed. SMW samples had considerably more complex Raman spectra. It was found that SMW transformed from tetragonal (room-temperature space group P42/n) to the cubic phase between 670 and 690 K; the phase transition temperature was dependent on sample preparation conditions, and it was considerably lower than in the case of large grain size powders. The role of grain size in phase transition is discussed. Mn ions were found to have a crucial role in the lattice dynamics of both materials.

AB - Polycrystalline Ba2MnWO6 (BMW) and Sr 2MnWO6 (SMW) samples were studied between 80 and 1200 K by Raman scattering spectroscopy. In the case of BMW (space group Fm3̄m), four Raman active vibrational modes, predicted by factor group analysis, were identified. Raman scattering studies with different wavelengths revealed a resonant bands between 300 and 800 cm-1. The origin of these bands was related to the Franck-Condon process. Line broadening versus temperature and phonon frequency were studied, and a qualitative explanation was proposed. SMW samples had considerably more complex Raman spectra. It was found that SMW transformed from tetragonal (room-temperature space group P42/n) to the cubic phase between 670 and 690 K; the phase transition temperature was dependent on sample preparation conditions, and it was considerably lower than in the case of large grain size powders. The role of grain size in phase transition is discussed. Mn ions were found to have a crucial role in the lattice dynamics of both materials.

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Raman scattering studies of the Ba₂MnWO₆ and Sr ₂MnWO₆ double perovskites

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