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Title: Anisotropic thermal expansion and anharmonic phonon behavior of mullite-type Bi{sub 2}Ga{sub 4}O{sub 9}

Abstract

Graphical abstract: - Highlights: • Anisotropic lattice thermal expansion of Bi{sub 2}Ga{sub 4}O{sub 9} was modeled using extended Grüneisen first-order approximation. • The model includes harmonic, quasi-harmonic and intrinsic anharmonic contributions to the internal energy. • Temperature dependent Raman frequency shift and line-width was analyzed using symmetric phonon decay channel. - Abstract: We report the lattice thermal expansion and the temperature-dependent phonon behavior of the mullite-type Bi{sub 2}Ga{sub 4}O{sub 9} complex oxide. The thermal expansion was studied using composite data collected from powder and single crystal X-ray diffraction between 100 K and 1273 K. The lattice expansion occurred in the order of a < c < b. The anisotropic expansion behavior was monitored with respect to thermal expansion coefficients and the anisotropy factor. The volume thermal expansion was expressed using an extended Grüneisen first-order approximation to the zero-pressure equation of state; the model includes harmonic, quasi-harmonic and intrinsic anharmonic contributions to the internal energy as a function of temperature. The temperature dependent Raman spectra were collected from a single crystal between 78 K and 1273 K. The shift of the frequencies and the broadening of the line-widths with increasing temperature helped to analyze the anharmonicity and the thermal behavior ofmore » some phonons.« less

Authors:
Publication Date:
OSTI Identifier:
22341772
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 48; Journal Issue: 9; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0025-5408
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANISOTROPY; CRYSTAL STRUCTURE; EQUATIONS OF STATE; MONOCRYSTALS; MULLITE; OXIDES; PHONONS; RAMAN SPECTRA; RAMAN SPECTROSCOPY; TEMPERATURE DEPENDENCE; THERMAL EXPANSION; X-RAY DIFFRACTION

Citation Formats

Murshed, M. Mangir, E-mail: murshed@uni-bremen.de, and Gesing, Thorsten M. Anisotropic thermal expansion and anharmonic phonon behavior of mullite-type Bi{sub 2}Ga{sub 4}O{sub 9}. United States: N. p., 2013. Web. doi:10.1016/J.MATERRESBULL.2013.05.007.
Murshed, M. Mangir, E-mail: murshed@uni-bremen.de, & Gesing, Thorsten M. Anisotropic thermal expansion and anharmonic phonon behavior of mullite-type Bi{sub 2}Ga{sub 4}O{sub 9}. United States. doi:10.1016/J.MATERRESBULL.2013.05.007.
Murshed, M. Mangir, E-mail: murshed@uni-bremen.de, and Gesing, Thorsten M. Sun . "Anisotropic thermal expansion and anharmonic phonon behavior of mullite-type Bi{sub 2}Ga{sub 4}O{sub 9}". United States. doi:10.1016/J.MATERRESBULL.2013.05.007.
@article{osti_22341772,
title = {Anisotropic thermal expansion and anharmonic phonon behavior of mullite-type Bi{sub 2}Ga{sub 4}O{sub 9}},
author = {Murshed, M. Mangir, E-mail: murshed@uni-bremen.de and Gesing, Thorsten M.},
abstractNote = {Graphical abstract: - Highlights: • Anisotropic lattice thermal expansion of Bi{sub 2}Ga{sub 4}O{sub 9} was modeled using extended Grüneisen first-order approximation. • The model includes harmonic, quasi-harmonic and intrinsic anharmonic contributions to the internal energy. • Temperature dependent Raman frequency shift and line-width was analyzed using symmetric phonon decay channel. - Abstract: We report the lattice thermal expansion and the temperature-dependent phonon behavior of the mullite-type Bi{sub 2}Ga{sub 4}O{sub 9} complex oxide. The thermal expansion was studied using composite data collected from powder and single crystal X-ray diffraction between 100 K and 1273 K. The lattice expansion occurred in the order of a < c < b. The anisotropic expansion behavior was monitored with respect to thermal expansion coefficients and the anisotropy factor. The volume thermal expansion was expressed using an extended Grüneisen first-order approximation to the zero-pressure equation of state; the model includes harmonic, quasi-harmonic and intrinsic anharmonic contributions to the internal energy as a function of temperature. The temperature dependent Raman spectra were collected from a single crystal between 78 K and 1273 K. The shift of the frequencies and the broadening of the line-widths with increasing temperature helped to analyze the anharmonicity and the thermal behavior of some phonons.},
doi = {10.1016/J.MATERRESBULL.2013.05.007},
journal = {Materials Research Bulletin},
issn = {0025-5408},
number = 9,
volume = 48,
place = {United States},
year = {2013},
month = {9}
}