Viscous flow behavior of four iron‐containing silicates with alumina, effects of composition and oxidation condition

The viscosity of four iron-containing silicates with alumina has been measured under oxidizing and reducing conditions over the temperature range 450° to 700°C. Initially, the compositions contain approximately 2, 5, 10, and 20 mol.% of trivalent metal oxide. The viscosities of compositions with approximately equimolar Fe3+ and Al3+ are compared to those determined for compositions with trivalent cation all Fe or all Al. Then the batch composition calculated to replace one half of the Fe3+ by Al3+ under oxidizing conditions is corrected for the divalent iron present under mildly reducing conditions in forming gas (95% N2-5% H2) and strongly reducing conditions with carbon. In general, the viscosity measured in air was higher than the viscosity measured in forming gas with or without carbon for a given temperature and composition. The glasses prepared under oxidizing conditions had Fe2+/Fe total ratios less than 0.25 and the glasses prepared under reducing conditions had Fe2+/Fe total ratios between 0.27 and 0.91. The viscosities for these glasses can be represented by a Vogel-Fulcher relation for each of the three oxidation conditions.

[1]  Pascal Richet,et al.  Viscosity of liquid silica, silicates and alumino-silicates , 1982 .

[2]  L. Klein,et al.  Conditions of formation of pyroxene excentroradial chondrules , 1982 .

[3]  L. Klein,et al.  Flow behavior of ten iron-containing silicate compositions , 1982 .

[4]  P. C. Hess,et al.  Redox equilibria and the structural role of iron in alumino-silicate melts , 1982 .

[5]  J. Phalippou,et al.  Spectroscopic behaviour and internal friction of glasses containing iron having different redox ratios , 1980 .

[6]  D. Virgo,et al.  Relations between the anionic structure and viscosity of silicate melts; a Raman spectroscopic study , 1980 .

[7]  T. Komatsu,et al.  ESR and Mössbauer studies of crystallization process of sodium iron silicate glass , 1980 .

[8]  L. Klein,et al.  Flow Behavior of Droplet Chondrules in the Manych (L-3) Chondrite , 1980 .

[9]  D. Uhlmann,et al.  A Simplified Model of Glass Formation , 1979 .

[10]  D. Virgo,et al.  Influence of pressure, temperature, and bulk composition on melt structures in the system NaAlSi3+) Si<2) O<6) , 1978 .

[11]  D. Walker,et al.  Differentiation of a very thick magma body and implications for the source regions of mare basalts , 1975 .

[12]  D. Uhlmann,et al.  Effects of iron oxidation state on viscosity, lunar composition 15555 , 1974 .

[13]  C. Labar,et al.  A spectroscopic determination of ferrous iron content in glasses , 1973 .

[14]  H. R. Shaw.  Viscosities of magmatic silicate liquids; an empirical method of prediction , 1972 .

[15]  Y. Bottinga,et al.  The viscosity of magmatic silicate liquids; a model calculation , 1972 .

[16]  D. Uhlmann,et al.  Viscous flow behavior of lunar compositions 14259 and 14310. , 1972 .

[17]  L. Ingram,et al.  The comprehensive analysis of coal ash and silicate rocks by atomic-absorption spectrophotometry by a fusion technique , 1970 .

[18]  E. F. Riebling.  Structure of Sodium Aluminosilicate Melts Containing at Least 50 mole % SiO2 at 1500°C , 1966 .

[19]  H. Schafer.  The determination of iron(II) oxide in silicate and refractory materials. Part II. A semi-micro titrimetric method for determining iron(II) oxide in silicate materials , 1966 .

[20]  D. Day,et al.  Properties of Soda Aluminosilicate Glasses: I, Refractive Index, Density, Molar Refractivity, and Infrared Absorption Spectra , 1962 .