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Long range B-site cation ordering and Briet-Wigner-Fano line shape of A1g-like Raman mode in Nd1-xSmx(Mg 0.5Ti0.5)O3 microwave dielectric ceramics
Vemuri Rama Krishna Murthy,
Published in
2013
Volume: 48
   
Issue: 2
Pages: 194 - 199
Abstract
Nd1-xSmx(Mg0.5Ti0.5)O 3 (x = 0.0-1.0) samples were prepared by solid-state reaction method. Rietveld refinement of X-ray diffraction data was done using P21/n space group with monoclinic symmetry, which supports 1:1 B-site cation ordering. Long range ordering (LRO) parameter decreased up to x = 0.5 and then found to increase with further increase in Sm concentration. The A1g-like mode in Raman spectra was observed to possess Briet-Wigner-Fano line shape. The variation in obtained line width of the A1g-like mode supported LRO. Microwave dielectric characteristics such as dielectric constant (εr), quality factor (Q) and temperature coefficient of resonant frequency (τf) were measured in the range of 7-9 GHz. εr decreased from 26.5 to 24.9 and τf become less negative from -58 ppm/°C to -36 ppm/°C with increase in Sm concentration. Q × f decreased from 47,500 GHz (for x = 0) to 39,800 GHz (for x = 0.5) and then increased to 44,600 GHz (for x = 1). © 2012 Elsevier Ltd.
About the journal
JournalMaterials Research Bulletin
ISSN00255408
Open AccessNo
Concepts (21)
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    B-SITE CATIONS
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    LINE SHAPE
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    Long range
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    LONG-RANGE ORDERING
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    Microwave dielectric ceramics
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    MICROWAVE DIELECTRICS
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    MONOCLINIC SYMMETRY
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    Quality factors
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    RAMAN MODES
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    SOLID STATE REACTION METHOD
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    Space groups
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    TEMPERATURE COEFFICIENT OF RESONANT FREQUENCY
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    X-ray diffraction data
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    Dielectric properties
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    Natural frequencies
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    Neodymium
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    Positive ions
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    Raman spectroscopy
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    Rietveld refinement
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    Solid state reactions
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    X ray diffraction