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Electrical Transport in Highly Conducting Titanates

Title data

Moos, Ralf ; Menesklou, Wolfgang ; Gnudi, Alain ; Härdtl, Karl Heinz:
Electrical Transport in Highly Conducting Titanates.
Event: 4th International Conference on Electronic Ceramics & Applications = Electroceramics IV , 05.-07. September 1994 , Aachen.
(Conference item: Conference , Speech )

Abstract in another language

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.

Further data

Item Type: Conference item (Speech)
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 > 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: 08 Jul 2015 09:36
Last Modified: 08 Jul 2015 09:36