title: Versatile apparatus for thermoelectric characterization of oxides at high temperatures.
abstract: An apparatus for measuring the Seebeck coefficient and electrical conductivity is presented and characterized. The device can be used in a wide temperature range from room temperature to 1050 °C and in all common atmospheres, including oxidizing, reducing, humid, and inert. The apparatus is suitable for samples with different geometries (disk-, bar-shaped), allowing a complete thermoelectric characterization (including thermal conductivity) on a single sample. The Seebeck coefficient α can be measured in both sample directions (in-plane and cross-plane) simultaneously. Electrical conductivity is measured via the van der Pauw method. Perovskite-type CaMnO3 and the misfit cobalt oxide (Ca2CoO3)q(CoO2) are studied to demonstrate the temperature range and to investigate the variation of the electrical properties as a function of the measurement atmosphere.
authors.affiliation: Centre for Materials Science and Nanotechnology, University of Oslo, Gaustadalléen 21, 0349 Oslo, Norway.
authors.forename: Matthias
authors.initials: M
authors.lastname: Schrade
authors.affiliation: Centre for Materials Science and Nanotechnology, University of Oslo, Gaustadalléen 21, 0349 Oslo, Norway.
authors.forename: Harald
authors.initials: H
authors.lastname: Fjeld
authors.affiliation: Centre for Materials Science and Nanotechnology, University of Oslo, Gaustadalléen 21, 0349 Oslo, Norway.
authors.forename: Truls
authors.initials: T
authors.lastname: Norby
authors.affiliation: Centre for Materials Science and Nanotechnology, University of Oslo, Gaustadalléen 21, 0349 Oslo, Norway.
authors.forename: Terje G
authors.initials: TG
authors.lastname: Finstad