Synergetic thermal effects for oxygen sorption and order-disorder transition on perovskite-type oxides

Z. H. Yang, Jerry Lin

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Simultaneous DSC-TGA measurements were conducted on a perovskite-type oxide, La0.1Sr0.9Co0.9Fe0.1O 3-δ when it was subject to a sudden change of oxygen activity in the gas environment (from 1.3x10-4 to 0.21 atm) at constant temperature. The DSC-TGA and XRD results show occurrence of synergetic thermal effects for exothermic oxygen sorption and endothermic oxygen vacancy order to disorder transition for the perovskite-type oxide in response to the sudden increase of oxygen activity in a large temperature range (350-800 °C). The perovskite-type ceramic transforms from the ordered (brownmillerite) to disordered (perovskite type) structure as temperature increases. The order to disorder phase transition temperature decreases with decreasing oxygen nonstoichiometry or increasing oxygen partial pressure, with the maximum transition temperature at 857.9 °C. The apparent heat measured for the perovskite-type ceramic sample during the oxygen sorption process changes from endothermic to exothermic one as temperature increases from 350 to 800 °C. The endothermic heat for phase transformation and exothermic heat for oxygen sorption for the perovskite-type oxide were estimated at 59.8 J/g and -180.5 kJ/mol, respectively, from the DSC-TGA measurements.

Original languageEnglish (US)
Pages (from-to)89-96
Number of pages8
JournalSolid State Ionics
Volume176
Issue number1-2
DOIs
StatePublished - Jan 14 2005
Externally publishedYes

Fingerprint

Order disorder transitions
Perovskite
Thermal effects
sorption
Oxides
temperature effects
Sorption
disorders
Oxygen
oxides
oxygen
Superconducting transition temperature
heat
Phase transitions
transition temperature
Temperature
ceramics
Oxygen vacancies
temperature
perovskite

Keywords

  • Order-disorder transition
  • Oxygen
  • Perovskite-type oxides

ASJC Scopus subject areas

  • Electrochemistry
  • Physical and Theoretical Chemistry
  • Energy Engineering and Power Technology
  • Materials Chemistry
  • Condensed Matter Physics

Cite this

Synergetic thermal effects for oxygen sorption and order-disorder transition on perovskite-type oxides. / Yang, Z. H.; Lin, Jerry.

In: Solid State Ionics, Vol. 176, No. 1-2, 14.01.2005, p. 89-96.

Research output: Contribution to journalArticle

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AB - Simultaneous DSC-TGA measurements were conducted on a perovskite-type oxide, La0.1Sr0.9Co0.9Fe0.1O 3-δ when it was subject to a sudden change of oxygen activity in the gas environment (from 1.3x10-4 to 0.21 atm) at constant temperature. The DSC-TGA and XRD results show occurrence of synergetic thermal effects for exothermic oxygen sorption and endothermic oxygen vacancy order to disorder transition for the perovskite-type oxide in response to the sudden increase of oxygen activity in a large temperature range (350-800 °C). The perovskite-type ceramic transforms from the ordered (brownmillerite) to disordered (perovskite type) structure as temperature increases. The order to disorder phase transition temperature decreases with decreasing oxygen nonstoichiometry or increasing oxygen partial pressure, with the maximum transition temperature at 857.9 °C. The apparent heat measured for the perovskite-type ceramic sample during the oxygen sorption process changes from endothermic to exothermic one as temperature increases from 350 to 800 °C. The endothermic heat for phase transformation and exothermic heat for oxygen sorption for the perovskite-type oxide were estimated at 59.8 J/g and -180.5 kJ/mol, respectively, from the DSC-TGA measurements.

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