Phase Evolution and Electrical Characterization of Bismuth Vanadate
Abstract
In the present study, phase, microstructure and electrical properties of BiVO4 sample prepared by solid state sintering route have been studied. Phase analysis of the sintered sample revealed the formation of single phase BiVO4with no evidence of the secondary phase within the detection limit of X-ray diffractometer. Furthermore, the crystal structure was investigated by Rietveld analysis which confirmed the monoclinic symmetry having lattice parameters a = 7.2478 Å, b = 11.695 Å, c = 5.0919 Å and ? = 134.255°. SEM micrographs showed dense and irregular shaped grains with sizes ranging from 1.2 µm to 15.2 µm. Dielectric properties as a function of temperature for the BiVO4 sample exhibited phase transition at three different temperatures (~69°C, ~280°C and ~465°C). The dielectric loss increases with increasing temperature, indicating the semiconducting like features at higher temperatures which were further confirmed using impedance spectroscopy data.References
D. Barreca, L. Depero, V.D. Noto, G. Rizzi, L. Sangaletti and
E. Tondello, "Thin films of bismuth vanadates with modifiable conduction properties", Chemistry of Materials, vol. 11, pp. 255-261, 1999.
M.C. Neves, T. Trindade, "Chemical bath deposition of BiVO4", Thin Solid Films, vol. 406, pp. 93-97, 2002.
T. Yang, D. Xia, "Self-assembly of highly crystalline spherical BiVO4 in aqueous solutions", Journal of Crystal Growth, vol. 311, pp. 4505-4509, 2009.
L. Zhou, W. Wang, L. Zhang, H. Xu and W. Zhu, "Single-crystalline BiVO4 microtubes with square cross-sections: microstructure, growth mechanism, and photocatalytic property", The Journal of Physical Chemistry C, vol. 111, pp. 13659-13664, 2007.
A. Bhattacharya, K. Mallick, A. Hartridge, "Phase transition in BiVO4", Materials Letters, vol. 30, pp. 7-13, 1997.
R.L. Frost, D.A. Henry, M.L. Weier and W.N. Martens, "Raman spectroscopy of three polymorphs of BiVO4: Cinobisvanite, dreyerite and pucherite, with comparisons to (VO4) 3-bearing-minerals: namibite, pottsite and schumacherite", Journal of Raman Spectroscopy, vol. 37, pp. 722-732, 2006.
D. Zhou, L.-X. Pang, W.-G. Qu, C.A. Randall, J. Guo, Z.-M. Qi,
T. Shao and X. Yao, "Dielectric behavior, band gap, in situ X-ray diffraction, Raman and infrared study on (1− x) BiVO 4–x (Li 0.5 Bi 0.5) MoO 4 solid solution", RSC Advances, vol. 3, vol. 5009-5014, 2013.
M. Gotić, S. Musić, M. Ivanda, M. Šoufek and S. Popović, "Synthesis and characterisation of bismuth (III) vanadate",
J.Molecular Structure, vol. 744, pp. 535-540, 2005.
A. Zhang and J. Zhang, "Effects of europium doping on the photocatalytic behavior of BiVO 4", J.Hazardous Materials, vol. 173, pp. 265-272, 2010.
J. Bierlein and A. Sleight, "Ferroelasticity in BiVO4", Solid State Communications, vol. 16, pp. 69-70, 1975.
S. Tokunaga, H. Kato and A. Kudo, "Selective preparation of monoclinic and tetragonal BiVO4 with scheelite structure and their photocatalytic properties", Chemistry of Materials, vol. 13, pp. 4624-4628, 2001.
E. Barsoukov and J.R. Macdonald, "Impedance spectroscopy: theory", experiment, and applications, John Wiley & Sons, 2005.
J.T. Irvine, D.C. Sinclair and A.R. West, "Electroceramics: characterization by impedance spectroscopy", Advanced Materials, vol. 2, pp. 132-138, 1990.
M. Amir, S. Atiq, S. Riaz and S. Naseem, “Effect of Ba-Substitution at Sr-Site on the Structural and Dielectric Characteristics of SrMnO3”, The Nucleus, vol . 52, pp. 155-158, 2015.
