Mössbauer investigations in the system Na2OFeOSiO2

Boon, J.A.

doi:10.1016/0009-2541(71)90006-4

Cited by 12 publications

(2 citation statements)

References 19 publications

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“…Like the Fe 3þ sextet parameters, the Fe 2þ doublet parameters of the 36CO/64CO 2 sample differed significantly from the mildly reduced and air-melted samples; its hCSi and hQSi values were significantly higher. Such high hCSi (1.5 mm/s vs. $1.16 mm/s for the other samples) and hQSi values (3.06 mm/s vs. $2.20 mm/s for the other samples) for a Fe 2þ doublet have been reported by Boon [51] for an Fe-rich silicate glass and by Kamo et al [52] for a phosphate glass (Fe 3 O 4 Á NaPO 3 ). In general, an increase in hCSi, opposite to the case of Fe 3þ environment, indicates an increase in symmetry or decrease in distortion around the Fe 2þ ion.…”

Section: Effect Of Co/co 2 Atmosphere On Iron Environmentssupporting

confidence: 64%

Mössbauer and optical spectroscopic study of temperature and redox effects on iron local environments in a Fe-doped (0.5 mol% Fe2O3) 18Na2O–72SiO2 glass

Kukkadapu

Smith

et al. 2003

Journal of Non-Crystalline Solids

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Mossbauer and optical spectroscopic study of temperature and Mossbauer and optical spectroscopic study of temperature and redox effects on iron local environments in a Fe-doped (0.5 mol% redox effects on iron local environments in a Fe-doped (0.5 mol% M€ o ossbauer and optical spectroscopic study of temperature and redox effects on iron local environments in a Fe-doped (0.5 mol% Fe 2 O 3) 18Na 2 O-72SiO 2 glass

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Section: Effect Of Co/co 2 Atmosphere On Iron Environmentssupporting

confidence: 64%

Mössbauer and optical spectroscopic study of temperature and redox effects on iron local environments in a Fe-doped (0.5 mol% Fe2O3) 18Na2O–72SiO2 glass

Kukkadapu

Smith

et al. 2003

Journal of Non-Crystalline Solids

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“…The structural state of Fe :+ in silicate glasses is less well established, both tetrahedral and octahedral coordinations being suggested. Recent results [Boon, 1971] suggest the presence of two types of octahedral sites, but this conclusion should be regarded as tentative.…”

Section: Their Model Represents the Logarithm Of Viscosity As A Lineamentioning

confidence: 99%

Effects of iron oxidation state on viscosity, lunar composition 15555

Cukierman¹,

Uhlmann²

1974

J. Geophys. Res.

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The viscous flow behavior of lunar composition 15555, which contains about 22.5 wt % FeO, has been determined over a range of temperature from 620° to 700°C and from 1215° to 1400°C. The material was synthesized under mildly reducing conditions to simulate the Fe2+ /total Fe ratio of the lunar environment. The effect of iron oxidation state on flow behavior in the high‐viscosity region has been evaluated for specimens of the 15555 composition having Fe2+/ total Fe ratios of 0.94, 0.76, and 0.20. Change of the Fe2+ concentration ratio from 0.94 to 0.76 had no observable effect on the viscosity; change of the ratio from 0.76 to 0.20 resulted in a dramatic increase in viscosity by some 3 orders of magnitude at a given temperature but did not change the form of the variation of viscosity with temperature. The flow behavior is discussed and related to the structural features of the glasses.

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