Hostname: page-component-78c5997874-m6dg7 Total loading time: 0 Render date: 2024-11-05T02:54:17.621Z Has data issue: false hasContentIssue false
  • English
  • Français

Nanocrystalline GdFeO3 via the gel-combustion process

Published online by Cambridge University Press:  03 March 2011

S.V. Chavan  and
A.K. Tyagi
S.V. Chavan
Affiliation:
Applied Chemistry Division, Bhabha Atomic Research Centre Mumbai – 400 085, India
A.K. Tyagi*
Affiliation:
Applied Chemistry Division, Bhabha Atomic Research Centre Mumbai – 400 085, India
*
a)Address all correspondence to this author. e-mail: [email protected]
Get access

Abstract

Nanocrystalline GdFeO3 powder was synthesized by a combustion technique, using glycine as the fuel and the corresponding metal nitrates as oxidants. Five different molar ratios of fuel-to-oxidant were chosen to study the effect of fuel content on the phase formation and the powder properties. The powders after calcination were characterized by x-ray diffraction (XRD) and crystallite sizes calculated by x-ray line broadening. The crystallite sizes for the phase pure products after calcination at 600 °C were in the range 40–65 nm. The transmission electron microscopy observations clearly highlight the pronounced crystallinity for the propellant chemistry samples. The nature of the agglomerates was investigated by light scattering studies. The lattice thermal expansion behavior was also studied by high-temperature XRD.

Keywords

AgglomerationCombustion synthesisNanoparticle
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 10 , October 2005 , pp. 2654 - 2659
Copyright
Copyright © Materials Research Society 2005

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1Beecroft, L.L. and Ober, C.K.: Nanocomposite materials for optical applications. Chem. Mater. 9, 1302 (1997).Google Scholar
2Rhodes, W.H.: Agglomerate and particle-size effects on sintering yttria-stabilized zirconia, J. Am. Ceram. Soc. 64, 19 (1981).CrossRefGoogle Scholar
3Weller, H.: Colloidal semiconductors Q-particles: Chemistry in the transition region between solid state and molecules. Angew. Chem. Int. Ed. Engl. 32, 41 (1993).CrossRefGoogle Scholar
4Siegel, R.W., Ramasamy, S., Hahn, H., Li, Z., Lu, T. and Gronsky, R.: Synthesis, characterization, and properties of nanophase TiO2. J. Mater. Res. 3, 1367 (1988).CrossRefGoogle Scholar
5Hahn, H., Logas, J. and Averback, R.S.: Sintering characteristics of nanocrystalline TiO2. J. Mater. Res. 5, 609 (1990).CrossRefGoogle Scholar
6Bauerle, G.L. and Nobe, K.: Ind. Eng. Chem. Prod. Rd. 13, 185 (1974).Google Scholar
7Bobeck, A.H.: Properties and device applications of magnetic domains in orthoferrites. Bell System Technol. J. 46, 1901 (1967).CrossRefGoogle Scholar
8Mathur, S., Shen, H., Lecerf, N., Kjekshus, A., Fjellvag, H. and Goya, G.: Nanocrystalline orthoferrite GdFeO3 from a novel heterobimetallic precursor. Adv. Mater. 14, 1405 (2002).Google Scholar
9Mathur, S., Veith, M., Rapalavicuite, R., Shen, H., Goya, G., Filho, W. and Berquo, T.: Molecule derived synthesis of nanocrystalline YFeO3 and investigations on its weak ferromagnetic behavior. Chem. Mater. 16, 1906 (2004).CrossRefGoogle Scholar
10Schmool, D.S., Keller, N., Guyot, M., Krishnan, R. and Tessier, M.: Evidence of very high coercive fields in orthoferrite phases of PLD grown thin films. J. Magn. Magn. Mater. 195, 291 (1999).Google Scholar
11Kingsley, J.J., Suresh, K. and Patil, K.C.: Combustion synthesis of fine-particle metal aluminates. J. Mater. Sci. 25, 1305 (1990).Google Scholar
12Pederson, R.L., Chick, L.A., and Exarhos, G.J.: Method of making metal oxide ceramic powders by using a combustible amino acid compound, U.S. Patent No. 5 114 702 (May 19, 1992).Google Scholar
13Bhaduri, S., Bhaduri, S.B. and Zhou, E.: Auto ignition synthesis and consolidation of Al2O3–ZrO2 nano/nano composite powders. J. Mater. Res. 13, 156 (1998).CrossRefGoogle Scholar
14Chavan, S.V. and Tyagi, A.K.: Preparation and characterization of Sr0.09Ce0.91O1.91, SrCeO3, Sr2CeO4 by glycine-nitrate combustion: A crucial role of oxidant-to-fuel ratio. J. Mater. Res. 19, 3181 (2004).Google Scholar
15Manoharan, S.S. and Patil, K.C.: Combustion synthesis of metal chromite powders. J. Am. Ceram. Soc. 75, 1012 (1992).Google Scholar
16Jain, S.R., Adiga, K.C. and Verneker, V.R. Pai: A new approach to thermochemical calculations of condensed fuel-oxidizer mixtures. Combust. Flame 40, 71 (1981).CrossRefGoogle Scholar
17Purohit, R.D., Sharma, B.P., Pillai, K.T. and Tyagi, A.K.: Ultrafine ceria powders via glycine-nitrate combustion. Mater. Res. Bull. 36, 2711 (2001).Google Scholar
18Chavan, S.V., Pillai, K.T., and Tyagi, A.K.: Combustion synthesis of nanocrystalline yttria: Tailoring of powder properties. (unpublished).Google Scholar
19Grier, D. and McCarthy, G. JCPDS-47-0067, North Dakota State University, Fargo, ND (1993).Google Scholar
20Chick, L.A., Pederson, L.R., Maupin, G.D., Bates, J.L., Thomas, L.E. and Exarhos, G.J.: Glycine-nitrate combustion synthesis of oxide ceramic powders. Mater. Lett. 10, 6 (1990).CrossRefGoogle Scholar
21Chavan, S.V. and Tyagi, A.K.: Combustion synthesis of nanocrystalline yttria-doped ceria. J. Mater. Res. 19, 474 (2004).Google Scholar
22Purohit, R.D., Saha, S., and Tyagi, A.K.: Nanostructured ceria powders through citrate-nitrate combustion. (unpublished).Google Scholar