Low temperature molten-salt synthesis of nanocrystalline cubic Sr{sub 2}SbMnO{sub 6}

Journal Article · Tue Dec 15 00:00:00 EST 2009 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2009.09.006· OSTI ID:21372422

Baral, Antara ^[1]; Varma, K B.R., ^[1]

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1. Materials Research Centre, Indian Institute of Science, Bangalore 560 012 (India)

Sr{sub 2}SbMnO{sub 6} (SSM) powders were successfully synthesized at reasonably low temperatures via molten-salt synthesis (MSS) method using eutectic composition of 0.635 Li{sub 2}SO{sub 4}-0.365 Na{sub 2}SO{sub 4} (flux). High-temperature cubic phase SSM was stabilized at room temperature by calcining the as-synthesized powders at 900 deg. C/10 h. The phase formation and morphology of these powders were characterized via X-ray powder diffraction and scanning electron microscopy, respectively. The SSM phase formation associated with {approx}60 nm sized crystallites was also confirmed by transmission electron microscopy. The activation energy associated with the particle growth was found to be 95+-5 kJ mol{sup -1}. The dielectric constant of the tetragonal phase of the ceramic (fabricated using this cubic phase powder) with and without the flux (sulphates) has been monitored as a function of frequency (100 Hz-1 MHz) at room temperature. Internal barrier layer capacitance (IBLC) model was invoked to rationalize the dielectric properties. - Graphical abstract: The as synthesized powders of Sr{sub 2}SbMnO{sub 6} calcined at 900 deg. C/10 h yielded a cubic phase ({approx}60 nm sized crystallites). Centrosymmetric tetragonal (I4/mcm) phase was obtained by increasing the calcination temperature to 1000 deg. C. Display Omitted

• OSTI ID: 21372422
• Journal Information: Journal of Solid State Chemistry, Vol. 182, Issue 12; Other Information: DOI: 10.1016/j.jssc.2009.09.006; PII: S0022-4596(09)00426-5; Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANTIMONY COMPOUNDS
CALCINATION
EUTECTICS
LITHIUM SULFATES
MANGANATES
MOLTEN SALTS
NANOSTRUCTURES
PERMITTIVITY
POWDERS
SCANNING ELECTRON MICROSCOPY
SODIUM SULFATES
STRONTIUM COMPOUNDS
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 1000-4000 K
TETRAGONAL LATTICES
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CHEMICAL REACTIONS
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DECOMPOSITION
DIELECTRIC PROPERTIES
DIFFRACTION
ELECTRICAL PROPERTIES
ELECTRON MICROSCOPY
LITHIUM COMPOUNDS
MANGANESE COMPOUNDS
MICROSCOPY
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PYROLYSIS
SALTS
SCATTERING
SODIUM COMPOUNDS
SULFATES
SULFUR COMPOUNDS
TEMPERATURE RANGE
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS