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The Ozawa's generalized time concept and YZ-master plots as a convenient tool for kinetic analysis of complex processes
Authors: Málek Jiří | Koga Nobuyoshi | Perez-Maqueda Luis A. | Criado Jose M.
Year: 2013
Type of publication: článek v odborném periodiku
Name of source: Journal of Thermal Analysis and Calorimetry
Publisher name: Springer
Page from-to: 1437-1446
Titles:
Language Name Abstract Keywords
cze Ozawův časově generalizovaný koncept a YZ-diagram jako konvenční nástroj pro kinetickou analýzu komplexních procesů Koncept generalizovaného času v neizotermní kinetice uvedl Ozawa v roce 1965 společně s dobře známým izokonverzním grafem, tzv. Ozawovým grafem. Generalizovaný čas je klíčovým konceptem ke spojení kinetických dat získaných při neizotermním experimentu s kinetikou stanovenou při konstantní teplotě. master plot; kinetika; zirkonium; krystalizace
eng The Ozawa's generalized time concept and YZ-master plots as a convenient tool for kinetic analysis of complex processes The concept of generalized time in non-isothermal kinetics was introduced by Ozawa in 1965, together with the well-known isoconversional plot, i.e., Ozawa plot. The generalized time is the key concept to tie the kinetic data under varying temperature to the kinetic relationship at a constant temperature. It is well known that many processes studied by thermal analysis and calorimetry reveal a complex nature. Therefore, the generalized time concept seems to be very useful for the description of the change in the rate behavior depending on the fractional conversion. Using the concept of theta, three kinds of experimental master plots can be formalized in differential, integral, and multiplied forms. Among others, combination of the differential and multiplied master plots, y(alpha) = (d alpha/d theta) and z(alpha) = (d alpha/d theta)theta, show a high performance to discriminate the kinetic model based on the maxima condition of y(alpha (y)*) and z(alpha (z)*). The alpha (y)* - alpha (y)* kinetic plot is a useful tool to visualize the complexity of the kinetic process and to determine the most suitable kinetic model. The usefulness of alpha (y)* - alpha (y)* kinetic plot and the YZ-master plots is illustrated as exemplified by the kinetic analyses of complex crystallization processes of the as-prepared, thermally and mechanically treated amorphous zirconia. master plot; kinetics; zirconia; crystallization

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