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

• Published in: Materials characterization Vol. 60; no. 4; pp. 322 - 326
• Main Authors: George, C.N., Thomas, J.K., Kumar, H.P., Suresh, M.K., Kumar, V.R., Wariar, P.R.S., Jose, R., Koshy, J.
• Format: Journal Article
• Language: English
• Published: New York, NY Elsevier Inc 01-04-2009; Elsevier
• Subjects: Agglomeration; Applied sciences; ATOMIC FORCE MICROSCOPY; BARIUM COMPOUNDS; Barium titanate; Barium titanates; Characterization; Combustion; Combustion synthesis; Cross-disciplinary physics: materials science; rheology; CRYSTALS; Dielectric properties; DIFFERENTIAL THERMAL ANALYSIS; Exact sciences and technology; FOURIER TRANSFORM SPECTROMETERS; GRAVIMETRIC ANALYSIS; LATTICE PARAMETERS; MATERIALS SCIENCE; Metals. Metallurgy; MHZ RANGE 01-100; MICROSTRUCTURE; Nanocrystals; Nanomaterials; Nanoparticles; Nanostructure; NANOSTRUCTURES; PELLETS; PERMITTIVITY; PEROVSKITE; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Physics; Powder metallurgy. Composite materials; Production techniques; SCANNING ELECTRON MICROSCOPY; Sintered metals and alloys. Pseudo alloys. Cermets; SINTERING; Solidification; SURFACES; SYNTHESIS; TEMPERATURE RANGE 0273-0400 K; TEMPERATURE RANGE 1000-4000 K; TITANATES; Nanoparticles; Characterization; Combustion synthesis; Barium titanate; Dielectric properties; Synthesis; Dielectric materials; Sintering; Combustion; Powder metallurgy; Ultrafine powder; Nanocrystal
• ISSN: 1044-5803; 1873-4189
• DOI: 10.1016/j.matchar.2008.09.012

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 Å. 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 °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
×
10
−
3
respectively.