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A. Buri Dipartimento di Ingegneria dei Materiali e della Produzione, Piazzale Tecchio, Napoli, Italy

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A. Costantini Dipartimento di Ingegneria dei Materiali e della Produzione, Piazzale Tecchio, Napoli, Italy

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G. Laudisio Dipartimento di Ingegneria dei Materiali e della Produzione, Piazzale Tecchio, Napoli, Italy

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R. Fresa Dipartimento di Ingegneria dei Materiali e della Produzione, Piazzale Tecchio, Napoli, Italy

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M. Catauro Dipartimento di Ingegneria dei Materiali e della Produzione, Piazzale Tecchio, Napoli, Italy

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F. Branda Dipartimento di Ingegneria dei Materiali e della Produzione, Piazzale Tecchio, Napoli, Italy

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Abstract  

Glasses of composition expressed by the following general formula xCaO·(1−x)SiO2 (0.30≤x≤0.50) can be prepared by means of the sol-gel route starting from tetramethylorthosilicate and calcium nitrate tetrahydrate They are all difficult to prepare by means of the traditional technique of quenching the melt, because of the high liquidus temperature,T1t that in the case ofx=0.3 glass isT1=1650°C. The DTA apparatus appears a valuable tool for defining the procedure necessary to obtain the glass through the sol-gel route. The glassx=0.3 is bioactive. The experimental results suggest that the gel structures, such as obtained at room temperature, are very similar; only at high temperature do the reactions of hydrolysis and polycondensation go to completion and the structural units characteristic of each glass are obtained.

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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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