Authors:
E. IllekovaInst. of Physics EPRC, Slov. Acad. Sci. Dubravská cesta 842 28 Bratislava Czechoslovakia

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P. Ambrovic
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P. DuhajInst. of Physics EPRC, Slov. Acad. Sci. Dubravská cesta 842 28 Bratislava Czechoslovakia

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The isothermal crystallization of amorphous alloys of the type (Pd100−xNix)83Si17 has been investigated by DSC. The character of the transformation depends upon the content of Ni. Ifx>30, material crystallizes probably without nucleation in a very narrow temperature range. Ifx⩽30, the crystallization process is controlled by a nucleationgrowth mechanism. The initial stages of transformation are characterized by a relatively short incubation period with an Arrhenius temperature-dependence. Afterwards, the time-dependence of the degree of conversion is sigmoidal. Ifα<0.1, thenp∼1 characterizes a homogeneous nucleation. If 0.1<α<0.9 than the Avrami exponent isp(α)∼3–4. Atα>0.9 so-called tails are observed.

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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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Geopolymers

Inorganic polymeric new materials

Author:
J. Davidovits