Characterization, sintering and dielectric properties of nanocrystalline barium titanate synthesized through a modified combustion process

Journal Article · Wed Apr 15 00:00:00 EDT 2009 · Materials Characterization

DOI:https://doi.org/10.1016/j.matchar.2008.09.012· OSTI ID:21192613

George, C N ^[1]; Kumar, H P; Suresh, M K ^[2]; Kumar, V R; Wariar, P R.S. ^[3]; Jose, R ^[4]; Koshy, J ^[1]

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1. Department of Physics, Bishop Moore College, Mavelikara, Kerala (India)
2. Department of Physics, Mar Ivanios College, Thiruvananthapuram, Kerala (India)
3. Department of Physics, University College, Thiruvananthapuram, Kerala (India)
4. Nanoscience and Nanotechnology Initiative, National University of Singapore (Singapore)

Nanocrystalline barium titanate has been synthesized through a modified combustion process in a single step for the first time. The as-prepared barium titanate powder is cubic perovskite with lattice constant a = 4.018 A. The phase purity of the nanopowder was examined using thermo gravimetric analysis, differential thermal analysis and Fourier transform infrared spectroscopy. Transmission electron microscopic investigations have shown that the particle size of the as-prepared powder is in the range 20-40 nm. The agglomerate size distribution of the as-prepared powder was studied using atomic force microscopy. The nanoparticles of barium titanate were sintered to 97% of the theoretical density at a temperature of 1350 deg. C for 3 h. The microstructure of the sintered surface was examined using scanning electron microscopy. The dielectric constant and loss factor of the sintered pellets at 1 MHz measured at room temperature were 1223 and 3.5 x 10{sup -3} respectively.

• OSTI ID: 21192613
• Journal Information: Materials Characterization, Vol. 60, Issue 4; Conference: 3. metallography, history and the fine arts symposium of the International Metallographic Society, Fort Lauderdale, FL (United States), 5-9 Aug 2007; Other Information: DOI: 10.1016/j.matchar.2008.09.012; PII: S1044-5803(08)00274-X; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ATOMIC FORCE MICROSCOPY
BARIUM COMPOUNDS
CRYSTALS
DIFFERENTIAL THERMAL ANALYSIS
FOURIER TRANSFORM SPECTROMETERS
GRAVIMETRIC ANALYSIS
LATTICE PARAMETERS
MHZ RANGE 01-100
MICROSTRUCTURE
NANOSTRUCTURES
PELLETS
PERMITTIVITY
PEROVSKITE
SCANNING ELECTRON MICROSCOPY
SINTERING
SURFACES
SYNTHESIS
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 1000-4000 K
TITANATES