Thermochemistry of vitreous antimony orthophosphate
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A vitreous form of antimony orthophosphate has been obtained using antimony polyphosphate as a precursor. Morphologically, it is composed of small uniform grains having ellipsoidal shapes. Prolonged thermal treatment leads to the transformation into a crystalline variety. According to TG curves, both forms start to evaporate at 920°C without decomposition. Melting point of crystalline SbPO4 has been determined to be 877°C. Thermomechanical study reveals plastic behavior due to the capacity to flow under shearing stress. Ceramics formation in the system Sb2O3-SbPO4 is discussed. The presence of glass domains in this system has not been confirmed.
Keywordsantimony orthophosphate glasses inorganic materials
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- 3.L. M. Volkova, A. S. Kamischeva, A. A. Udovenko, Yu. N. Mikhailov and V. I. Bovna, Coord. Chem., 9 (1983) 609.Google Scholar
- 4.K. M. Kurbanov, Kristallografia, 32 (1987) 746.Google Scholar
- 5.S. A. Dembovsky and E. A. Chechetking, Glass Formation, Nauka, Moscow 1990.Google Scholar
- 7.Natl. Bur. Stand. (U.S.) Monogr. 25; 21, 22(1984), quoted in ICDS, PDF file 35-0829.Google Scholar
- 11.W. R. Guimarães, Physico-chemical Properties of Antimony Phosphates, Master thesis, Department of Physics, Federal University of Mato Grosso do Sul, Campo Grande, Brazil 2004.Google Scholar
- 12.P. J. Flory, Principles of Polymer Chemistry, Cornell University Press, Ithaca, London 1986.Google Scholar
- 13.H. G. Wiedemann, R. Riesen and A. Boller, Elasticity Characterization of Materials During Thermal Treatment by Thermal Mechanical Analysis, Materials Characterization by Thermomechanical Analysis, ASTM STP 1136, A.T. Riga and C. M Neag, Eds, American Society for Testing and Materials, Philadelphia, 1991.Google Scholar
- 14.M. Nalin, Antimony Polyanionic Glasses, Doctoral thesis, Institute of Chemistry, Araraquara, Brazil 2002.Google Scholar