Evaluation of glass-forming tendency by means of DTA

Ciecińska

2014

J Therm Anal Calorim

Vitrification is the most effective method of the hazardous waste immobilization. Toxic elements are incorporated into glass structure. Iron phosphate glasses are presently being considered as a matrix for storage of the radioactive waste which cannot be vitrified using a conventional borosilicate glass. Influence of Na 2 SO 4 as one of the components such the waste on thermal properties and crystallization ability of iron phosphate waste glass was studied. It was observed that Na 2 SO 4 decreases transformation temperature and increases DC p . The glass characteristic temperatures, glass crystallization ability, and crystallizing phases were determined. Na 2 SO 4 increases the glass crystallization ability which could be related with DC p heat capacity accompanying glass transition changes. The glass internal structure rebuilding, accompanying the sodium content increase, is considered. It is shown that DC p is a suitable, structure-sensitive glass crystallization ability, parameter.

Section: Resultsmentioning

confidence: 99%

Thermal properties of phosphate glasses for salt waste immobilization

Ciecińska

2014

J Therm Anal Calorim

“…There exists in a literature number of different glass stability criterions, e.g. [22][23][24][25][26], and a nice comparison between them for iron phosphate glasses is given in [27], and most of those criterions show the similar dependence on glass composition. In case of iron phosphate glasses, one of the most frequently used is Hruby criterion, and therefore, the glass stability of the investigated materials was evaluated using it [16,27].…”

Section: Dsc Analysis Of the Glassesmentioning

confidence: 99%

“…In case of iron phosphate glasses, one of the most frequently used is Hruby criterion, and therefore, the glass stability of the investigated materials was evaluated using it [16,27]. According to [22], the higher K H value, the greater would be its stability against crystallization. The K H values were evaluated according to the formulae:…”

Section: Dsc Analysis Of the Glassesmentioning

confidence: 99%

Thermal properties of 60P2O5–20Fe2O3–20Al2O3 glass for salt waste immobilization

Ciecińska

et al. 2015

J Therm Anal Calorim

Vitrification is the most effective method of hazardous waste immobilization. Toxic elements are incorporated into a glass structure. Iron alumino-phosphate glasses are presently being considered as a matrix for storage of a radioactive waste which cannot be vitrified using conventional borosilicate waste glasses. Influence of Na 2 SO 4 as a one of components such the waste on thermal properties and crystallization ability of 60P 2 O 5 -20Fe 2 O 3 -20Al 2 O 3 glass was studied. It was observed that Na 2 SO 4 decreases transformation temperature and increases DC p . The glass characteristic temperatures, glass crystallization ability and crystallizing phases were determined. Na 2 SO 4 increases the glass crystallization ability which could be related with DC p heat capacity accompanying glass transition changes. The glass internal structure rebuilding accompanying the sodium content increase is considered. The obtained results were compared with structural model previously developed for 60P 2 O 5 -40Fe 2 O 3 glass and showed the structural similarity between these glasses.

“…Glass formation has been widely explored, and some parameters such as reduced glass transition (T g /T l ), degree of supercooling (ΔT x = T x -T g ), and similar variables are used to characterize GFA [15,31,85]. Unlike previous approaches, which were based on the stabilization of the liquid phase and ignored the effect of the composition on the stability of the crystalline phases, Ref.…”

Section: Kinetic Approach To Glass Formationmentioning

confidence: 99%

The formation of glass: a quantitative perspective

Jiang

Zhang

2015

Sci. China Mater.

In constant use since ancient times, glass remains a highly valued material that is ubiquitous in daily life. Today, glass has become an indispensable and essential component in such fields as photonics, optical communications, photovoltaic cells, household appliances, vehicles, and building materials. However, one of major stumbling blocks for its optimal use is the low glass-forming ability (GFA) of many glass-forming compositions, which is far from being adequately solved. Understanding the nature of the GFAs of materials is the key to the development of new glasses with improved properties and manufacturability for various engineering applications. The rapid development of new glasses over the past several decades has led to increasingly complex material compositions. However, the phase diagrams of these materials have yet to be properly addressed even though such diagrams are extremely useful in rationally designing glass-forming compositions and predicting their behavior in pursuit of new functional glasses with particular desired properties. In this context, the present review strives to provide new insights into the formation of glasses and glass-forming regions through quantitative calculations and predictions based on a comprehensive survey and analysis of the existing experimental observations and theoretical considerations, a considerable portion of which stems from work performed in our own laboratory.