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Advances in Condensed Matter Physics
Volume 2014, Article ID 735878, 6 pages
Research Article

Structural, Optical, and Compactness Characteristics of Nanocrystalline Synthesized through an Autoigniting Combustion Method

1Department of Physics, St. Aloysius College, Edathua, Kerala 689573, India
2Electronic Materials Research Laboratory, Department of Physics, Mar Ivanios College, Thiruvananthapuram, Kerala 695 015, India
3Department of Physics, St. John's College, Anchal, Kollam District, Kerala 691306, India

Received 31 May 2013; Revised 5 October 2013; Accepted 5 October 2013; Published 9 January 2014

Academic Editor: R. N. P. Choudhary

Copyright © 2014 K. C. Mathai et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Nanoparticles of calcium metaniobate compound are prepared by an autoigniting combustion technique and its structural, optical, and dielectric properties are investigated. The X-ray diffraction, Fourier-transform Raman, and infrared studies reveal that calcium metaniobate possesses phase pure orthorhombic columbite structure with space group of Pbcn. The average particle size of the as-prepared nanoparticles obtained from both the Scherrer formula and transmission electron microscopy is ~37 nm. The optical band gap calculated from Tauc's Plot is 3.25 eV. Photoluminescence studies reveal that Calcium metaniobate can be used as an idealphotoluminarmaterial. The powders are pelletised and sintered at an optimized temperature of in a short duration of two hours, yielding a high density. The morphology of the sintered pellet is further examined using scanning electron microscopy. The dielectric constant and loss factor values measured at 5 MHz for a well-sintered Calcium metaniobate pellet are found to be 27.6 and respectively, at room temperature.