Abstract
Electrical conductivity, thermopower and oxygen content were measured for La1-xSrxFeO3-δ (x=0.2, 0.5, 0.9) within the oxygen partial pressure range 10-4-0.5 atm and at temperatures 750-950°C. The dominating charge carriers under these experimental conditions are electron holes. The results of oxygen nonstoichiometry measurements are used to estimate the concentration of holes and to analyze data on conductivity and thermopower. The changes in thermopower are described by the model assuming that the number of sites accessible for migration of holes is independent on oxygen content. The mobility of electron holes is calculated, and it is found to be virtually independent on temperature in the compositions with x0.5 exhibit thermally activated mobility and mobility values about 0.1 cm2 V -1 s-1 or smaller. It is suggested that the main contribution to the composition dependent variations in electron hole mobility are associated with Coulomb interactions at small x's, whereas at high degrees of doping the mobility of holes is most strongly affected by the increasing amount of oxygen vacancies.
| Original language | English |
|---|---|
| Pages (from-to) | 921-927 |
| Number of pages | 7 |
| Journal | Journal of Solid State Chemistry |
| Volume | 178 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - Mar 2005 |
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Keywords
- Conductivity
- Ferrites
- Mobility
- Oxygen nonstoichiometry
- Thermopower
ASJC Scopus subject areas
- Inorganic Chemistry
- Physical and Theoretical Chemistry
- Materials Chemistry
Cite this
p-type electron transport in La1-xSrxFeO 3-δ at high temperatures. / Patrakeev, M. V.; Leonidov, I. A.; Kozhevnikov, V. L.; Poeppelmeier, Kenneth R.
In: Journal of Solid State Chemistry, Vol. 178, No. 3, 03.2005, p. 921-927.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - p-type electron transport in La1-xSrxFeO 3-δ at high temperatures
AU - Patrakeev, M. V.
AU - Leonidov, I. A.
AU - Kozhevnikov, V. L.
AU - Poeppelmeier, Kenneth R
PY - 2005/3
Y1 - 2005/3
N2 - Electrical conductivity, thermopower and oxygen content were measured for La1-xSrxFeO3-δ (x=0.2, 0.5, 0.9) within the oxygen partial pressure range 10-4-0.5 atm and at temperatures 750-950°C. The dominating charge carriers under these experimental conditions are electron holes. The results of oxygen nonstoichiometry measurements are used to estimate the concentration of holes and to analyze data on conductivity and thermopower. The changes in thermopower are described by the model assuming that the number of sites accessible for migration of holes is independent on oxygen content. The mobility of electron holes is calculated, and it is found to be virtually independent on temperature in the compositions with x0.5 exhibit thermally activated mobility and mobility values about 0.1 cm2 V -1 s-1 or smaller. It is suggested that the main contribution to the composition dependent variations in electron hole mobility are associated with Coulomb interactions at small x's, whereas at high degrees of doping the mobility of holes is most strongly affected by the increasing amount of oxygen vacancies.
AB - Electrical conductivity, thermopower and oxygen content were measured for La1-xSrxFeO3-δ (x=0.2, 0.5, 0.9) within the oxygen partial pressure range 10-4-0.5 atm and at temperatures 750-950°C. The dominating charge carriers under these experimental conditions are electron holes. The results of oxygen nonstoichiometry measurements are used to estimate the concentration of holes and to analyze data on conductivity and thermopower. The changes in thermopower are described by the model assuming that the number of sites accessible for migration of holes is independent on oxygen content. The mobility of electron holes is calculated, and it is found to be virtually independent on temperature in the compositions with x0.5 exhibit thermally activated mobility and mobility values about 0.1 cm2 V -1 s-1 or smaller. It is suggested that the main contribution to the composition dependent variations in electron hole mobility are associated with Coulomb interactions at small x's, whereas at high degrees of doping the mobility of holes is most strongly affected by the increasing amount of oxygen vacancies.
KW - Conductivity
KW - Ferrites
KW - Mobility
KW - Oxygen nonstoichiometry
KW - Thermopower
UR - http://www.scopus.com/inward/record.url?scp=17744390358&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=17744390358&partnerID=8YFLogxK
U2 - 10.1016/j.jssc.2004.10.038
DO - 10.1016/j.jssc.2004.10.038
M3 - Article
AN - SCOPUS:17744390358
VL - 178
SP - 921
EP - 927
JO - Journal of Solid State Chemistry
JF - Journal of Solid State Chemistry
SN - 0022-4596
IS - 3
ER -