Glass and Ceramic Based Systems and General Processing Methods

Donald, I. W.

doi:10.1002/9781444319354.ch3

Waste Immobilization in Glass and Ceramic Based Hosts 2010

DOI: 10.1002/9781444319354.ch3

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Glass and Ceramic Based Systems and General Processing Methods

I. W. Donald

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Cited by 2 publications

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Rheology of a sodium‐molybdenum borosilicate melt undergoing phase separation

Pereira,

Schuller,

Wadsworth

et al. 2023

Int J of Appl Glass Sci

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During glass production, phase separation can result in the formation of suspended liquid droplets, which can cause changes in the system rheology. In nuclear waste vitrification context, some new glassy matrices may present this phase separation matter, but the mechanisms controlling the viscosity changes have not yet been determined. Here, we measure the viscosity of a sodium‐borosilicate melt containing dissolved MoO3 at different temperatures and subject to different applied shear strain rates. We observe that (i) the viscosity increases sharply as the temperature decreases and (ii) at any constant temperature below 1000°C, the system presents non‐Newtonian response. Using transmission electron microscope observations coupled with viscosity calculations, we interpret the cause of the observed changes as the result of phase separation. We show that the viscosity increase on cooling is in excess of the predicted temperature dependence for a homogeneous melt of the starting composition. The increase is due to the formation of a second phase and is controlled by chemical and structural modifications of the matrix during the loss of the elements that form the droplets. This work provides insights into the rheology of a system composed of two composition sets due to a miscibility gap.

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Rheology of a sodium‐molybdenum borosilicate melt undergoing phase separation

Pereira,

Schuller,

Wadsworth

et al. 2023

Int J of Appl Glass Sci

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Immobilization of “Mo6+” in Monazite Lattice: Synthesis and Characterization of New Phosphomolybdates, La1−xCaxP1−yMoyO4, Where x=y=0.1-0.9

Kumar

Gopal

2011

Journal of the American Ceramic Society

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In the process of high‐level nuclear waste (HLW) disposal, monazite, LaPO4 is considered as one of the potential phosphate ceramics to immobilize lanthanides and actinides. HLW along with hazardous long‐lived nuclides contains elements such as Zr, Mo, etc. in higher wt%. In the current investigation, an attempt was made to introduce “Mo” into the monazite lattice. The phosphomolybdates of the formula La1−xCaxP1−yMoyO4, x, y=0.1–0.9 were synthesized by a solution route and characterized by powder X‐ray diffraction, FT‐IR, TGA/DTA, and scanning electron microscopic techniques. The phases with compositions La0.9Ca0.1P0.9Mo0.1O4, La0.8Ca0.2P0.8Mo0.2O4, and La0.7Ca0.3P0.7Mo0.3O4 were found to be crystallized in monazite structure. The composition La0.1Ca0.9P0.1Mo0.9O4 with X=Y=0.9 crystallized in the scheelite structure. The compositions indicate the immobilization of ∼4.1, 8.5, 12.9, and 42.5 at. wt% of “Mo.” With x, y=0.6, 0.5, 0.4, 0.3, and 0.2, along with the monazite phase, formation of a secondary phase LaP3O9 was observed.

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Glass and Ceramic Based Systems and General Processing Methods

Cited by 2 publications

References 49 publications

Rheology of a sodium‐molybdenum borosilicate melt undergoing phase separation

Rheology of a sodium‐molybdenum borosilicate melt undergoing phase separation

Immobilization of “Mo6+” in Monazite Lattice: Synthesis and Characterization of New Phosphomolybdates, La1−xCaxP1−yMoyO4, Where x=y=0.1-0.9

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