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http://dx.doi.org/10.12989/amr.2012.1.3.191

Optical and dielectric properties of SrMoO4 powders prepared by the combustion synthesis method  

Vidya, S. (Electronic Materials Research Laboratory, Department of Physics, Mar Ivanios College)
John, Annamma (Electronic Materials Research Laboratory, Department of Physics, Mar Ivanios College)
Solomon, Sam (Dielectric Materials Research Laboratory, Department of Physics, St. John's College)
Thomas, J.K. (Electronic Materials Research Laboratory, Department of Physics, Mar Ivanios College)
Publication Information
Advances in materials Research / v.1, no.3, 2012 , pp. 191-204 More about this Journal
Abstract
In this paper, we report on the obtention of nanocrystalline $SrMoO_4$ synthesized through modified combustion process. These powders were characterized by X-ray diffraction, Fourier Transform Raman and Infrared Spectroscopy. These studies reveal that the scheelite-type $SrMoO_4$ crystallizes in tetragonal structure with I41/${\alpha}$ (N#88) space group. Transmission electron microscopy image shows that the nanocrystalline $SrMoO_4$ powders have average size of 18 nm. The optical band gap determined from the UV-V is absorption spectra for the as prepared sample is 3.7 eV. These powders showed a strong green photoluminescence emission. The samples are sintered at a relatively low temperature of $850^{\circ}C$. The morphology of the sintered pellet is studied with scanning electron microscopy. The dielectric constant and loss factor values obtained at 5 MHz for a well sintered $SrMoO_4$ pellet has been found to be 9.50 and $7.5{\times}10^{-3}$ respectively. Thus nano $SrMoO_4$ is a potential candidate for low temperature co-fired ceramics and luminescent applications.
Keywords
photoluminescence; combustion synthesis; nanostructures; dielectric; band gap; sintering;
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