Equilibration kinetics of (La,Sr)MnO3

M. Rekas; T. Bak; Janusz Nowotny; C. C. Sorrell; Y. Zhao; K. Foger; E. R. Vance

doi:10.1023/A:1008978810809

Equilibration kinetics of (La,Sr)MnO₃

M. Rekas
, T. Bak
, Janusz Nowotny
, C. C. Sorrell
, Y. Zhao
, K. Foger
, E. R. Vance

University of New South Wales
Ceramic Fuel Cells Limited
Australian Nuclear Science and Technology Organisation

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

4 Citations (Scopus)

Abstract

The present work reports isothermal changes of oxygen non-stoichiometry for the perovskite-type electrode material (La_0.8Sr_0.2)MnO₃ in the temperature range 945-1255 K. A thermogravimetric method was used to monitor the rate of the gas/solid equilibration. For equilibration degrees larger than 0.5, the equilibration kinetic data can be described by a diffusion equation. The determined chemical diffusion coefficient depends essentially on the oxygen partial pressure. Its temperature dependence can be expressed by the following expressions at low and high p(O₂), respectively: Dchem=(1.9±1.6)10^-3exp-(83.4±15.8)kJ/mol ^-1/RT(cm²s^-1) (1) Dchem=(1.6±0.6)10^-1exp-(121.2±8.2)kJ/mol ^-1/RT(cm2s^-1) (2)

Original language	English
Pages (from-to)	697-702
Number of pages	6
Journal	Journal of Materials Science: Materials in Electronics
Volume	11
Issue number	9
DOIs	https://doi.org/10.1023/A:1008978810809
Publication status	Published - 2000
Externally published	Yes

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title = "Equilibration kinetics of (La,Sr)MnO3",

abstract = "The present work reports isothermal changes of oxygen non-stoichiometry for the perovskite-type electrode material (La0.8Sr0.2)MnO3 in the temperature range 945-1255 K. A thermogravimetric method was used to monitor the rate of the gas/solid equilibration. For equilibration degrees larger than 0.5, the equilibration kinetic data can be described by a diffusion equation. The determined chemical diffusion coefficient depends essentially on the oxygen partial pressure. Its temperature dependence can be expressed by the following expressions at low and high p(O2), respectively: Dchem=(1.9±1.6)10-3exp-(83.4±15.8)kJ/mol -1/RT(cm2s-1) (1) Dchem=(1.6±0.6)10-1exp-(121.2±8.2)kJ/mol -1/RT(cm2s-1) (2)",

author = "M. Rekas and T. Bak and Janusz Nowotny and Sorrell, \{C. C.\} and Y. Zhao and K. Foger and Vance, \{E. R.\}",

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doi = "10.1023/A:1008978810809",

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}

TY - JOUR

T1 - Equilibration kinetics of (La,Sr)MnO3

AU - Rekas, M.

AU - Bak, T.

AU - Nowotny, Janusz

AU - Sorrell, C. C.

AU - Zhao, Y.

AU - Foger, K.

AU - Vance, E. R.

PY - 2000

Y1 - 2000

N2 - The present work reports isothermal changes of oxygen non-stoichiometry for the perovskite-type electrode material (La0.8Sr0.2)MnO3 in the temperature range 945-1255 K. A thermogravimetric method was used to monitor the rate of the gas/solid equilibration. For equilibration degrees larger than 0.5, the equilibration kinetic data can be described by a diffusion equation. The determined chemical diffusion coefficient depends essentially on the oxygen partial pressure. Its temperature dependence can be expressed by the following expressions at low and high p(O2), respectively: Dchem=(1.9±1.6)10-3exp-(83.4±15.8)kJ/mol -1/RT(cm2s-1) (1) Dchem=(1.6±0.6)10-1exp-(121.2±8.2)kJ/mol -1/RT(cm2s-1) (2)

AB - The present work reports isothermal changes of oxygen non-stoichiometry for the perovskite-type electrode material (La0.8Sr0.2)MnO3 in the temperature range 945-1255 K. A thermogravimetric method was used to monitor the rate of the gas/solid equilibration. For equilibration degrees larger than 0.5, the equilibration kinetic data can be described by a diffusion equation. The determined chemical diffusion coefficient depends essentially on the oxygen partial pressure. Its temperature dependence can be expressed by the following expressions at low and high p(O2), respectively: Dchem=(1.9±1.6)10-3exp-(83.4±15.8)kJ/mol -1/RT(cm2s-1) (1) Dchem=(1.6±0.6)10-1exp-(121.2±8.2)kJ/mol -1/RT(cm2s-1) (2)

UR - https://www.scopus.com/pages/publications/0042186762

U2 - 10.1023/A:1008978810809

DO - 10.1023/A:1008978810809

M3 - Article

AN - SCOPUS:0042186762

SN - 0957-4522

VL - 11

SP - 697

EP - 702

JO - Journal of Materials Science: Materials in Electronics

JF - Journal of Materials Science: Materials in Electronics

IS - 9

ER -

Equilibration kinetics of (La,Sr)MnO₃

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