Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 103: Issue 2
Equivalent isothermal curves for kinetic analysis of non-stoichiometry
Author:
Takeo Ozawa 18-6 Jousuishinmachi, Kodaira, Tokyo 187-0023, Japan

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Pages:
471–472
Online Publication Date:
24 Jun 2010
Publication Date:
01 Feb 2011
Article Category:
Brief Report
DOI:
https://doi.org/10.1007/s10973-010-0921-7
Keywords:
Non-stoichiometry; Kinetics; Equivalent isothermal curves; Synthesized isothermal curves; Cyclic temperature change; Cyclic mass change; YBa2Cu3O7−δ
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Abstract

The author proposed a method for analyzing kinetics of non-stoichiometry by observing cyclic mass change behavior under cyclic temperature change. Because relationship between the mass and the mass change rate is independent on the previous thermal history of the specimen, we can get equivalent isothermal curves (synthesized isothermal curves) by extracting datum pairs of mass and mass change rate at a given temperature and many conversions, changing the frequencies. The equivalent isothermal curves are really the same as curves of conversion and rate of conversion observed isothermally, so that conventional methods for kinetic analysis can be similarly applied to the equivalent isothermal curves. When multiple elementary processes are proceeding, they can be separately observed by changing the frequency, so that, the method proposed in this short communication is useful and effective to elucidate kinetics of non-stoichiometry as well as reversible reactions.

  • 1. Ozawa, T Non-stoichiometry of YBa2Cu3O7-d observed by repeated temperature scanning. J Therm Anal Calorim 2003 72:337–345 .

  • 2. Ozawa, T Temperature control modes in thermal analysis. Pure Appl Chem 2000 72:2083–2099 .

  • 3. Ozawa, T Kinetic analysis by repeated temperature scanning. Part 1. Theory and methods. Thermochim Acta 2000 356:173–180 .

  • 4. Ozawa, T Further thoughts on temperature oscillation in thermal analysis. J Therm Anal Calorim 2003 73:1013–1018 .

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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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