at Google ScholarTitle data
Moos, Ralf ; Gnudi, Alain ; Härdtl, Karl Heinz:
Thermopower of Sr₁₋ₓLaₓTiO₃ Ceramics.
In: Journal of Applied Physics.
Vol. 78
(1995)
Issue 8
.
- pp. 5042-5047.
ISSN 1089-7550
DOI: https://doi.org/10.1063/1.359731
Abstract in another language
The thermopower η of Sr1−xLaxTiO3 ceramics was investigated up to x=0.5 and in the temperature range between 150 K and 1200 K. In addition, the carrier concentrationn was determined by Hall measurements and by a chemical Ti3+‐analysis. For low temperatures and high n, η depends linearly on temperature and on n −2/3, as expected from a degenerate quasi free electron gas. In the case of high temperatures and low n, the absolute value of η rises with 1.5⋅ln10⋅k/e per decade of temperature and with ln10⋅k/e per decade of carrier concentration, as expected from a classical broad‐band semiconductor obeying the Boltzmann statistics. In the range of degeneration an effective massm eff of 4.2 electron masses can be deduced without the assumption of a transport factor A_e. In the classical range A_e =3 can be evaluated, requiring only a temperature and lanthanum independent m eff. Thus, the thermopower of Sr1−xLaxTiO3ceramics can be described by a constant effective mass and a constant transport factor within a wide range of temperature and lanthanum content. Furthermore, the transition from degeneration to classical behavior can be described as a function of temperature and electron density, e.g., at room temperature it takes place at about x≊0.2 (i.e., n≊3.4⋅10^21/cm3).
Further data
| Item Type: | Article in a journal |
|---|---|
| Refereed: | Yes |
| Institutions of the University: | Faculties > Faculty of Engineering Science Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos Faculties Faculties > Faculty of Engineering Science > Chair Functional Materials |
| Result of work at the UBT: | No |
| DDC Subjects: | 600 Technology, medicine, applied sciences > 620 Engineering |
| Date Deposited: | 09 Feb 2015 12:29 |
| Last Modified: | 29 Jun 2022 09:36 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/6617 |