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Moos, Ralf ; Menesklou, Wolfgang ; Gnudi, Alain ; Härdtl, Karl Heinz:
Electrical Transport in Highly Conducting Titanates.
1994
Veranstaltung: 4th International Conference on Electronic Ceramics & Applications = Electroceramics IV
, 05.-07. September 1994
, Aachen.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung
,
Vortrag
)
Abstract
In this study the transport properties of highly donor doped strontium titanate Sr1-xLaxTiO3-y are investigated. Measurements of the electrical conductivity and of the hall coefficient are carried out on highly doped ceramics with x≤0.4 and y<0.016 and on single crystals with x=0.1 and on undoped strontium titanate single crystals with y<0.03 in order to estimate the influence of oxygen vacancies (intrinsic donors). Results: The mobility of the free electrons at room temperature does not depend on donor concentration. Even at the highest densities of intrinsic or extrinsic donors their value remains at 7±1 cm²/Vs, leading to a conductivity of 7000(S/cm) for x=0.4 at room temperature. The comparison of single and polycristalline titanates show, that even in those highly conducting ceramics the electrical behavior is governed by grain boundary phenomena, lowering the conductivity. Only by high temperature processing in dry hydrogen, the effects of these grain boundaries disappear.
Weitere Angaben
| Publikationsform: | Veranstaltungsbeitrag (Vortrag) |
|---|---|
| Begutachteter Beitrag: | Ja |
| Institutionen der Universität: | Fakultäten > Fakultät für Ingenieurwissenschaften Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Funktionsmaterialien > Lehrstuhl Funktionsmaterialien - Univ.-Prof. Dr.-Ing. Ralf Moos Fakultäten Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Funktionsmaterialien |
| Titel an der UBT entstanden: | Nein |
| Themengebiete aus DDC: | 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften |
| Eingestellt am: | 08 Jul 2015 09:36 |
| Letzte Änderung: | 08 Jul 2015 09:36 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/15750 |