Formation and properties of SnO–MgO–P2O5 glasses

Shyu, Jong-Jy; Yeh, Chih-Hsien

doi:10.1007/s10853-006-0766-4

Cited by 28 publications

(12 citation statements)

References 20 publications

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“…Other studies by Shih and Shiu [82], Shyu and Yeh [83] and Jung et al [84] document the effects upon chemical durability of phosphate glasses containing no alkalis by replacing high field strength modifiers by low field strength modifiers. In these works the trend exhibited by replacing alkalis discussed above is different.…”

Section: Chemical Durabilitymentioning

confidence: 99%

Effects of modifier additions on the thermal properties, chemical durability, oxidation state and structure of iron phosphate glasses

Bingham

Hand

Hannant

et al. 2009

Journal of Non-Crystalline Solids

168

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Modified iron phosphate glasses have been prepared with nominal molar compositions [(1−x)·(0.6P2O5-0.4Fe2O3)]·xRySO4, where x = 0-0.5 in increments of 0.1 and R = Li, Na, K, Mg, Ca, Ba, or Pb and y = 1 or 2. In most cases the vast majority or all of the sulfate volatalizes and quarternary P2O5-Fe2O3-FeO-RyOz glasses or partially crystalline materials are formed. Here we have characterized the structure, thermal properties, chemical durability and redox state of these materials. Raman spectroscopy indicates that increasing modifier oxide additions result in depolymerization of the phosphate network such that the average value of i, the number of bridging oxygens per -(PO4)-tetrahedron, and expressed as Q i , decreases. Differences have been observed between the structural effects of different modifier types but these are secondary to the amount of modifier added. Alkali additions have little effect on density; slightly increasing Tg and Td; increasing α and Tliq; and promoting bulk crystallization at temperatures of 600-700 °C.Additions of divalent cations increase density, α, Tg, Td, Tliq and promote bulk crystallization at temperatures of 700-800 °C. Overall the addition of divalent cations has a less deleterious effect on glass stability than alkali additions.57 FeMössbauer spectroscopy confirms that iron is present as Fe 2+ and Fe 3+ ions which primarily occupy distorted octahedral sites. This is consistent with accepted structural models for iron phosphate glasses. The iron redox ratio, Fe 2+/ΣFe, has a value of 0.13-0.29 for the glasses studied. The base glass exhibits a very low aqueous leach rate when measured by Product Consistency Test B, a standard durability test for nuclear waste glasses. The addition of high quantities of alkali oxide (30-40 mol% R2O) to the base glass increases leach rates, but only to levels comparable with those measured for a commercial soda-lime-silica glass and for a surrogate nuclear waste-loaded borosilicate glass. Divalent cation additions decrease aqueous leach rates and large additions (30-50 mol% RO) provide exceptionally low leach rates that are 2-3 orders of magnitude lower than have been measured for the surrogate waste-loaded borosilicate glass. The P2O5-Fe2O3-FeO-BaO glasses reported here show particular promise as they are ultra-durable, thermally stable, lowmelting glasses with a large glass-forming compositional range.

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Section: Chemical Durabilitymentioning

confidence: 99%

Effects of modifier additions on the thermal properties, chemical durability, oxidation state and structure of iron phosphate glasses

Bingham

Hand

Hannant

et al. 2009

Journal of Non-Crystalline Solids

168

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“…The presence of an electrical field promotes atomic diffusion, which makes atomic mobility easier, facilitating crystal growth during the crystallization process. According to other authors an external field during crystallization of lead titanate compounds, enhances a preferred crystallographic orientation [21] and modifies the ferroelectric properties of the crystalline phase, which leads to the changes in the spontaneous polarization and domains properties [22]. A similar effect by the external field, that is, an increase in the degree of polarization, which leads to an increase in domains dimension has been observed in the Ge:Sb:Te films.…”

Section: Contributedmentioning

confidence: 68%

Effect of electrical field on crystallization and ferroelectric properties of Ge:Sb:Te films

Gervacio-Arciniega

Prokhorov

Beltrán

et al. 2011

Phys. Status Solidi C

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In this work impedance spectroscopy has been used to investigate of the NaCl type‐hexagonal transition in stoichiometric Ge2Sb2Te5 and in non‐stoichiometric (Ge24Sb15Te61) films. The temperature dependence of capacitance in all films shows an abrupt change (about 4‐6 times) at the temperature corresponding to the end of the NaCl type‐hexagonal transition. Additional, impedance measurements were carried out in films which have been crystallized with an external DC electric field. Comparing the results in the films crystallized with and without the external electric field, it is observed that in films crystallized with an external electric field, the capacitance increases during the NaCl type‐hexagonal transition for about 9‐15 times and that the piezoresponse force microscopy measurements have shown ferroelectric domains in the NaCl type phase. External electrical field changes significantly the onset of amorphous‐NaCl type crystallization temperature which could be related with an increase in atomic diffusion, promoting the growth of the crystalline phase. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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“…The glass formation and properties (T g , CTE, and chemical durability) of the as-cast glasses have been investigated. 28) The sinterability, wetting, flowability, crystallization, and the resulting properties of the 60SnO10MgO30P 2 O 5 (mole%) glass powder have also been investigated. 29), 30) Although phosphate sealing glasses can provide adequate flow at the sealing temperature, their coefficients of thermal expansion (CTE, up to > 180 © 10 ¹7 K ¹1 5), 6) ) are too high to match several low-CTE materials such as silicon.…”

Section: ¹1mentioning

confidence: 99%

“…28) To reduce the apparent CTE of the sealing material, powder filler of low CTE such as ¢-quartz solid solutions, ¢-eucryptite, magnesium pyrophosphate, etc, is usually added to the sealing glass.…”

Section: ¹1mentioning

confidence: 99%

“…This magnesium phosphate phase is identified as M 3 P according to the XRD patterns of the SMP samples sintered at higher temperatures. 28) Moreover, the cells show an elongated shape with a longitudinal axis which is nearly parallel to the substrate surface. Also noted is that the cell size is close to the original size of the SMP glass particles (3744¯m).…”

Section: Interfacial Reactions Between Smp Glass and Cmp Ceramicmentioning

confidence: 99%

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Sintering, crystallization, and properties of a low-viscosity SnO–MgO–P2O5 glass filled with (Co0.5Mg0.5)2P2O7 ceramic: influence of filler particle size

Shyu

Lin

2012

J. Ceram. Soc. Japan

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The coefficients of thermal expansion (CTE) of low-viscosity phosphate sealing glasses are too high to match low-CTE materials such as silicon. In this study, a low-viscosity SnOMgOP 2 O 5 (SMP) glass powder was mixed with 15 vol % of a negative thermal expansion cobalt-magnesium pyrophosphate (Co 0.5 Mg 0.5 ) 2 P 2 O 7 (CMP) ceramic filler to reduce the thermal expansion of the sealing material. The influences of the addition of CMP filler and the CMP particle size on the sintering, crystallization, and the resulting properties of the CMP-filled SMP composites were investigated. It was discovered that the decrease in CMP particle size decreases the effectiveness of CTE reduction of the sintered composites, the crystallization tendency of SMP glass, the softening temperature of the sintered composites, and the resistance to flow above the softening temperature.

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Formation and properties of SnO–MgO–P2O5 glasses

Cited by 28 publications

References 20 publications

Effects of modifier additions on the thermal properties, chemical durability, oxidation state and structure of iron phosphate glasses

Effects of modifier additions on the thermal properties, chemical durability, oxidation state and structure of iron phosphate glasses

Effect of electrical field on crystallization and ferroelectric properties of Ge:Sb:Te films

Sintering, crystallization, and properties of a low-viscosity SnO–MgO–P<sub>2</sub>O<sub>5</sub> glass filled with (Co<sub>0.5</sub>Mg<sub>0.5</sub>)<sub>2</sub>P<sub>2</sub>O<sub>7</sub> ceramic: influence of filler particle size

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