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, Ravi; Li, Hong; Smith, Gary L.; Crum, Jarrod V.; Jeoung, Jun-Sik; Poisl, W. Howard; Weinberg, Michael C.

doi:10.1016/s0022-3093(02)01815-x

Cited by 32 publications

(10 citation statements)

References 33 publications

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“…A significant distortion of the polyhedra also indicates this, while the oxygen polyhedra of the network forming ions usually have higher degree of symmetry. The obtained results are in agreement with the results in the litera ture from studies on the structural state of iron in glass using various spectroscopic methods [20,[30][31][32][33][34][35][36][37], including the Mössbauer spectroscopy method in glass for the immobilization of radioactive waste [38][39][40].…”

Section: Discussionsupporting

confidence: 88%

The structural state of iron in multicomponent aluminum iron borosilicate glass depending on their composition and synthesis conditions

et al. 2015

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The oxidation states and coordination environment of iron ions in borosilicate glass used for the immobilization of iron containing radioactive waste are studied by the methods of Mössbauer and Fourier transform IR spectroscopies. In homogeneous glass, containing no more than 50 wt % of waste oxides, iron is present in the form of Fe 3+ and Fe 2+ ions in octahedral coordination with oxygen. The phase of a iron con taining spinel, in which iron atoms with an oxidation number of +3 in the magnetically ordered state sur rounded tetrahedrally by oxygen atoms (Fe 3+ O 4 ) and iron in the two and trivalent states in the octahedral oxygen environment (Fe 3+ O 6 + Fe 2+ O 6 ) are present, is precipitated at higher waste concentrations. Both the Mössbauer and IR spectra of glass crystalline materials are combinations of the corresponding individual spectra. The quantitative ratio of the doubly and triply charged iron ions in samples depends on the synthesis conditions. The maximum fraction of iron in the glass phase (about 28%) and, at the same time, the maxi mum fraction of the Fe 3+ ions (91.3%) are observed in the sample prepared in a crucible by heating in a lab oratory furnace in the air environment and subsequent quenching on a metal sheet.

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Section: Discussionsupporting

confidence: 88%

The structural state of iron in multicomponent aluminum iron borosilicate glass depending on their composition and synthesis conditions

et al. 2015

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“…Lubas et al [11] studied by IR some glasses prepared mainly from basalt and found that these samples have high crystallization capability when heat treated. Many other articles have been published concerned with the study of various glasses with composition similar to that of the present samples [12][13][14].…”

Section: Introductionmentioning

confidence: 90%

Structural Study of Glass and Glass Ceramics Prepared with Egyptian Basalt

Hassaan

Saudi

Saad

et al. 2015

Silicon

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Egyptian basalt rock was used to prepare some glasses with different additives of Na 2 O by the melt quenching method. The prepared glasses were characterized applying FTIR, XRD and Mössbauer Effect (ME) spectroscopy. XRD indicated that all the samples showed a homogeneous glassy phase except the sample containing 35 mol % of Na 2 O which showed a very small crystalline phase of less than 5 %. FTIR measurements indicated the presence of various structural units including SiO 4, FeO 4 and AlO 4 . ME hyperfine parameters indicated the presence of both Fe 2+ and Fe 3+ in the low Na 2 O content glasses (the first three samples), while the iron in the high Na 2 O content glasses (the last three samples) showed only the Fe 3+ state. All the glass samples were heated at 900 • C for 6 h, of which XRD analysis showed different crystallites of nanometer size. ME spectra of the heat-treated (HT) samples indicated the presence of magnesium ferrites as confirmed by XRD study.

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“…[63][64][65][66] These observations suggest that both the loading of Gd 2 Ti 2 O 7 in the composite and the annealing temperature affect the silicate network in the glass-ceramic composite materials. when the composites were annealed at 750 o C, which can be described by the following equilibrium reaction: 4Fe 3+ +2O 2- [70][71][72][73] The reduction of Fe 3+ to Fe 2+ at 1100 o C may also be caused by Gd 2 Ti 2 O 7 crystallites dissolving in the glass matrix when the composite materials were annealed at this temperature. These observations indicate that the oxidation state and CN of Fe in the composite materials are strongly affected by the annealing temperature.…”

Section: Si L 23 -Edge Xanesmentioning

confidence: 99%

A study of the electronic structure and structural stability of Gd₂Ti₂O₇ based glass-ceramic composites

Aluri

Grosvenor

2015

RSC Adv.

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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

Cited by 32 publications

References 33 publications

The structural state of iron in multicomponent aluminum iron borosilicate glass depending on their composition and synthesis conditions

The structural state of iron in multicomponent aluminum iron borosilicate glass depending on their composition and synthesis conditions

Structural Study of Glass and Glass Ceramics Prepared with Egyptian Basalt

A study of the electronic structure and structural stability of Gd₂Ti₂O₇ based glass-ceramic composites

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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

Cited by 32 publications

References 33 publications

The structural state of iron in multicomponent aluminum iron borosilicate glass depending on their composition and synthesis conditions

The structural state of iron in multicomponent aluminum iron borosilicate glass depending on their composition and synthesis conditions

Structural Study of Glass and Glass Ceramics Prepared with Egyptian Basalt

A study of the electronic structure and structural stability of Gd2Ti2O7 based glass-ceramic composites

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A study of the electronic structure and structural stability of Gd₂Ti₂O₇ based glass-ceramic composites