NDLI: Influence of modifiers and glass-forming ions on the crystallization of glasses of the NaCaPO$_{4}$–SiO$

Content Provider	Springer Nature Link
Author	Sitarz, M. Bulat, K. Szumera, M.
Copyright Year	2012
Abstract	Silicate–phosphate glasses of the XYPO$_{4}$–SiO$_{2}$ and XYPO$_{4}$–SiO$_{2}$–AlPO$_{4}$ (where X = Na$^{+}$ and/or K$^{+}$ and Y = Ca$^{2+}$ and/or Mg$^{2+}$) systems have been the subject of the presented investigations. Bioactive glasses from these systems are the base for obtaining glass-crystalline biomaterials through a direct crystallization. However, growth of crystalline phases very adversely affects the bioactivity of the glasses. Uncontrolled growth of crystalline phases can be reduced by means of a glass phase separation phenomenon in the silicate–phosphate glasses because boundaries of inclusion-matrix phase may be a barrier limiting the growth of crystalline phases. Microscopic and EDX investigations which have been carried out have shown that glass phase separation occurs in glasses belonging to XYPO$_{4}$–SiO$_{2}$ and XYPO$_{4}$–SiO$_{2}$–AlPO$_{4}$ systems. Introduction of aluminum ions into the glass structure leads to a rapid homogenization of its texture. Based on DSC examinations it has been found out that crystallization of the glasses of XYPO$_{4}$–SiO$_{2}$ systems is a multistep process. The presence of several (the number depends on the type of modifiers and glass-forming ions) clearly separated exothermic peaks in DSC curves of investigated glasses makes it possible to crystallize only the inclusions with the matrix remaining amorphous or vice versa. It has been shown that, crystallization of glasses of XYPO$_{4}$–SiO$_{2}$–AlPO$_{4}$ system is single-stage process, which is the consequence of the homogenizing effect of aluminum ions on their texture.
Starting Page	577
Ending Page	584
Page Count	8
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	109
Issue Number	2
e-ISSN	15728943
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-01-12
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Phospho-silicate Devitrification Direct crystallization Thermal analysis Analytical Chemistry Inorganic Chemistry Physical Chemistry Measurement Science and Instrumentation Polymer Sciences
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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