Kinetic analysis of superconducting YBa2O7, by thermogravimetry in high vacuum

Kenzo Nagase; Hiroko Yokobayashi; Masae Kikuchi; Ayako Tokiwa; Yasuhiko Syono; Yoshiyuki Morioka

doi:10.1016/0040-6031(91)80067-S

Kinetic analysis of superconducting YBa₂O₇, by thermogravimetry in high vacuum

Kenzo Nagase, Hiroko Yokobayashi, Masae Kikuchi, Ayako Tokiwa, Yasuhiko Syono, Yoshiyuki Morioka

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

Superconducting YBa₂Cu₃O₇, was subjected to high vacuum thermogravimetry (TG) at various heating rates in the range from room temperature to 1000°C. Two distinct weight-loss steps, each of which corresponds to the evolution of almost 1/20₂, were observed on the TG curve. The product following the first step was apparently the non-stoichiometric compound YBa₂Cu₃O_7-δ. The rate equation for the first step was dδ/dt = k(1-δ); the corresponding specific rate constant, k, was 1.8 × 10^-3 s^-1 at 490°C, the activation energy, E_a, was 75 kJ mol^-1 and the frequency factor, A, was 3.0 × 10² s^-1.

Original language	English
Pages (from-to)	207-213
Number of pages	7
Journal	Thermochimica Acta
Volume	175
Issue number	2
DOIs	https://doi.org/10.1016/0040-6031(91)80067-S
Publication status	Published - 1991 Mar 15
Externally published	Yes

ASJC Scopus subject areas

Instrumentation
Condensed Matter Physics
Physical and Theoretical Chemistry

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Cite this

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title = "Kinetic analysis of superconducting YBa2O7, by thermogravimetry in high vacuum",

abstract = "Superconducting YBa2Cu3O7, was subjected to high vacuum thermogravimetry (TG) at various heating rates in the range from room temperature to 1000°C. Two distinct weight-loss steps, each of which corresponds to the evolution of almost 1/202, were observed on the TG curve. The product following the first step was apparently the non-stoichiometric compound YBa2Cu3O7-δ. The rate equation for the first step was dδ/dt = k(1-δ); the corresponding specific rate constant, k, was 1.8 × 10-3 s-1 at 490°C, the activation energy, Ea, was 75 kJ mol-1 and the frequency factor, A, was 3.0 × 102 s-1.",

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T1 - Kinetic analysis of superconducting YBa2O7, by thermogravimetry in high vacuum

AU - Nagase, Kenzo

AU - Yokobayashi, Hiroko

AU - Kikuchi, Masae

AU - Tokiwa, Ayako

AU - Syono, Yasuhiko

AU - Morioka, Yoshiyuki

PY - 1991/3/15

Y1 - 1991/3/15

N2 - Superconducting YBa2Cu3O7, was subjected to high vacuum thermogravimetry (TG) at various heating rates in the range from room temperature to 1000°C. Two distinct weight-loss steps, each of which corresponds to the evolution of almost 1/202, were observed on the TG curve. The product following the first step was apparently the non-stoichiometric compound YBa2Cu3O7-δ. The rate equation for the first step was dδ/dt = k(1-δ); the corresponding specific rate constant, k, was 1.8 × 10-3 s-1 at 490°C, the activation energy, Ea, was 75 kJ mol-1 and the frequency factor, A, was 3.0 × 102 s-1.

AB - Superconducting YBa2Cu3O7, was subjected to high vacuum thermogravimetry (TG) at various heating rates in the range from room temperature to 1000°C. Two distinct weight-loss steps, each of which corresponds to the evolution of almost 1/202, were observed on the TG curve. The product following the first step was apparently the non-stoichiometric compound YBa2Cu3O7-δ. The rate equation for the first step was dδ/dt = k(1-δ); the corresponding specific rate constant, k, was 1.8 × 10-3 s-1 at 490°C, the activation energy, Ea, was 75 kJ mol-1 and the frequency factor, A, was 3.0 × 102 s-1.

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Kinetic analysis of superconducting YBa₂O₇, by thermogravimetry in high vacuum

Abstract

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