Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 44: Issue 3
Determination of avrami parameters of hydroxyapatite and β-wollastonite in bioactive phosphor—Silica glasses
Author: L. Illesova 1
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  • 1 Slovak Technical University Department of Physical Metallurgy, Faculty of Material Science and Technology 831 02 Bratislava Slovakia 831 02 Bratislava Slovakia
Pages:
589–595
Online Publication Date:
06 Jul 2007
Publication Date:
01 Mar 1995
Article Category:
Research Article
DOI:
https://doi.org/10.1007/bf02636278
Keywords:
Avrami parameters of HA and β-W; bioactive ceramics; HA and β-W crystallization
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Abstract  

The properties of biologically active glasses in the system SiO2−P2O5−MgO−CaO were studied. Crystalline hydroxyapatite (HA) and β-wollastonite (β-W) were used after heat treatment (1100C). The influence of the glass particle size (0.071–2.5 mm) and of glass powder (d50=15.1 μm) on the behaviour of the products during differential thermal analysis was followed. These analyses indicated that the β-W probably originates from surface nucleation, and HA from bulk nucleation. The differentiation was confirmed by calculation of the Avrami parameters (n) with the Pi-loyan-Borchardt analytical method. For HA and β-W, the calculated values ofn were 2.96 and 1.91. The surface-nucleated glasses exhibited predominant bidimensional crystal growth.

Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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