Synthesis of nanocrystalline magnesium titanate by an auto-igniting combustion technique and its structural, spectroscopic and dielectric properties

Journal Article · Thu Jul 15 00:00:00 EDT 2010 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2010.03.019· OSTI ID:22207322

Suresh, M. K. ^[1]; Sreemoolanadhan, H. ^[2]; George, C. N. ^[3]; John, Annamma; Solomon, Sam ^[4]; Wariar, P. R.S. ^[5]; Koshy, J. ^[1]

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1. Electronic Materials Research Laboratory, DST-FIST Sponsored Postgraduate and Research Department of Physics, Mar Ivanios College, Nalanchira, Thiruvananthapuram 695015, Kerala (India)
2. Vikram Sarabai Space Centre, Indian Space Research Organization, Department of Space, Thiruvananthapuram (India)
3. Department of Physics, Bishop Moore College, Mavelikkara (India)
4. Dielectric Materials Research Laboratory, Department of Physics, St. John's College, Anchal 691306, Kerala (India)
5. Department of Physics, University College, Thiruvananthapuram, Kerala (India)

Nanocrystalline magnesium titanate was synthesized through an auto-ignited combustion method. The phase purity of the powder was examined using X-ray diffraction, thermo gravimetric analysis, differential thermal analysis, Fourier transform infrared spectroscopy and Raman spectroscopy. The transmission electron microscopy study showed that the particle size of the as-prepared powder was in between 20 and 40 nm. The nanopowder could be sintered to 98% of the theoretical density at 1200 {sup o}C for 3 h. The microstructure of the sintered surface was examined using scanning electron microscopy. The dielectric constant ({epsilon}{sub r}) of 16.7 and loss factor (tan {delta}) of the order of 10{sup -4} were obtained at 5 MHz when measured using LCR meter. The quality factor (Q{sub u} x f) 73,700 and temperature coefficient of resonant frequency ({tau}{sub f}) -44.3 ppm/{sup o}C, at 6.5 GHz are the best reported values for sintered pellets obtained from phase pure nanocrystalline MgTiO{sub 3} powder.

• OSTI ID: 22207322
• Journal Information: Materials Research Bulletin, Vol. 45, Issue 7; Other Information: Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
CRYSTALS
DIFFERENTIAL THERMAL ANALYSIS
FOURIER TRANSFORM SPECTROMETERS
GRAVIMETRIC ANALYSIS
MAGNESIUM
MICROSTRUCTURE
NANOSTRUCTURES
PARTICLE SIZE
PERMITTIVITY
POWDERS
QUALITY FACTOR
RAMAN SPECTROSCOPY
SCANNING ELECTRON MICROSCOPY
SYNTHESIS
TEMPERATURE COEFFICIENT
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION