Tytuł artykułu
Autorzy
Wybrane pełne teksty z tego czasopisma
Identyfikatory
Warianty tytułu
Konferencja
7th Seminar Porous Glasses - Special Glasses PGL, 2005, Szklarska Poręba, Poland, September 10-14, 2005 r.
Języki publikacji
Abstrakty
Formation of crystal phases in glass and the kinetics of the crystal growth are commonly interpreted on the basis of classical nucleation theory (CNT), a thermodynamic description of the formation and growth of clusters of atoms (nuclei) of a new phase in heterogeneous system. The high resolution electron microscopy (HREM) has been used to recognize this clusters (nuclei) formation, their nature and structure. The atomic scale mechanism of the formation of the crystal phase structure within the disordered structure of glass near the temperature Tg was studied. HREM and other methods of the early stages of crystallization of the SiO2-Al2O3-MgO glass studies, with TiO2 as a crystallization activator, revealed that glass crystallization can be realized directly through rearrangement of the parent glass structure elements as disorder-order transformation. Its mechanism is similar to the solid solution decomposition or polymorphic transformation. However in the glass with ZrO2 admixture, crystallizing in a liquid state, the mechanism of crystal phase formation is different. Zirconia ZrO2 particles precipitate and cordierite crystals are growing on them. Validity of CNT for describing the near glass transformation temperature Tg crystallization and nano glass ceramics formation appears disputable. Alternative way of explaining this process is proposed.
Słowa kluczowe
Czasopismo
Rocznik
Tom
Strony
819--827
Opis fizyczny
bibliogr. 10 poz.
Twórcy
autor
- Faculty of Materials Science and Ceramics, AGH-University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków
Bibliografia
- [1] Uhlmann D.R. Chalmers B., The energetics of nucleation, Industrial and Engineering Chemistry 57(9), 1965, pp. 19-31.
- [2] Strnad Z., Glass-Ceramic Materials, Elsevier, Amsterdam 1984.
- [3] Stoch L., Nature and philosophy of thermal processes in minerals and inorganic materials, Journal of Thermal Analysis and Calorimetry 48(1), 1997, pp. 121-33.
- [4] Stoch L., Strucrture and crystallization of multicomponent glasses, [In] Proc. XVII. Int. Congress on Glass, Edinbourgh, Vol. 1, Soc. Glass Sci. Tech., Shefield UK 2001, pp. 62-73.
- [5] Stoch L., Nanocrystalline glass-ceramics formation, Optica Applicata 33(1), 2003, pp. 115-23.
- [6] Pinckney L.R.. Beall G.H., Nanocrystalline non-alkali glass-ceramics, Journal of Non-Crystalline Solids 219, 1997, pp. 219-27.
- [7] Dutkiewicz J., Stoch L., Morgel L.J., Kostorz G., Stoch P., Analytical and HREM study of the early stages of SiO2-Al2O3-(Mg, Zn)O glass crystallisation, Materials Chemistry and Physics 81(2-3), 2003, pp. 411-3.
- [8] Wange p., Hohe T., Russel Ch., Schnapp J.D., Microstructure-property relationship in high-strength MgO-Al2O3-SiO2-TiO2 glass-ceramics, Journal of Non-Crystalline Solids 298(2-3), 2002, pp. 137-45.
- [9] Petzoldt J., Pannhorst W., Chemistry and structure of glass-ceramic materials for high precision optical applications, Journal of Non-Crystalline Solids 129(1-3), 1991, pp. 191-8.
- [10] Stoch L ., Thermal analysis and thermochemistry of vitreous into crystalline state transition, Journal of Thermal Analysis and Calorimetry 77(1), 2004, pp. 7-16.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BPW1-0020-0023