Conductivity and carrier traps in La1-xSrxCo 1-zMnzO3-δ ( x=0.3; z=0 and 0.25)

V. L. Kozhevnikov, I. A. Leonidov, E. B. Mitberg, M. V. Patrakeev, A. N. Petrov, Kenneth R Poeppelmeier

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Measurements of the equilibrium oxygen content, electrical conductivity and thermopower in the perovskite-like solid solution La0.7Sr 0.3Co1-zMnzO3-δ (z=0 and 0.25) as a function of the temperature and oxygen partial pressure are used to determine the temperature dependence of the conductivity and thermopower at different values of the oxygen deficiency. A model for a hopping conductor with screened charge disproportionation is applied for the data analysis in combination with trapping reactions of n- and p-type carriers on local oxygen vacancy clusters and manganese cations, respectively. Changes in the ratio of n-type to p-type mobility are due to variations in oxygen vacancy concentration and manganese content, while the energetic parameters governing charge disproportionation of the trivalent cobalt cations and formation of vacancy associates are shown to be essentially invariable. These calculated charge carrier site occupancies are used to model temperature variations of the electrical properties in La0.7Sr0.3Co1-zMn zO3-δ in favorable correspondence with experimental observations.

Original languageEnglish
Pages (from-to)296-304
Number of pages9
JournalJournal of Solid State Chemistry
Volume172
Issue number2
DOIs
Publication statusPublished - May 2003

Fingerprint

Thermoelectric power
traps
Oxygen vacancies
Manganese
Oxygen
conductivity
Cations
oxygen
Positive ions
manganese
Cobalt
Charge carriers
cations
Partial pressure
Perovskite
Temperature
Vacancies
Solid solutions
hypoxia
Electric properties

Keywords

  • Cobaltite
  • Electrical conductivity
  • Hopping conductor
  • Manganite
  • Oxygen content
  • Perovskite
  • Thermopower

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry

Cite this

Conductivity and carrier traps in La1-xSrxCo 1-zMnzO3-δ ( x=0.3; z=0 and 0.25). / Kozhevnikov, V. L.; Leonidov, I. A.; Mitberg, E. B.; Patrakeev, M. V.; Petrov, A. N.; Poeppelmeier, Kenneth R.

In: Journal of Solid State Chemistry, Vol. 172, No. 2, 05.2003, p. 296-304.

Research output: Contribution to journalArticle

Kozhevnikov, V. L. ; Leonidov, I. A. ; Mitberg, E. B. ; Patrakeev, M. V. ; Petrov, A. N. ; Poeppelmeier, Kenneth R. / Conductivity and carrier traps in La1-xSrxCo 1-zMnzO3-δ ( x=0.3; z=0 and 0.25). In: Journal of Solid State Chemistry. 2003 ; Vol. 172, No. 2. pp. 296-304.
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