Work

High-temperature thermoelectric properties of the double-perovskite ruthenium oxide (Sr1−xLax)2ErRuO6

Year: 2012

Type: article

Abstract: We have prepared polycrystalline samples of (Sr1−xLax)2ErRuO6 and (Sr1−xLax)2YRuO6, and have measured the resistivity, Seebeck coefficient, thermal conductivity, susceptibility, and x-ray absorption in order to evaluate the electronic states and thermoelectric properties of the doped double-perovskite ruthenates. We have observed a large Seebeck coefficient of −160 μV/K and a low thermal conductivity of 7 mW/cmK for x = 0.1 at 800 K in air. These two values are suitable for efficient oxide thermoelectrics, although the resistivity is still as high as 1 Ω cm. From the susceptibility and x-ray absorption measurements, we find that the doped electrons exist as Ru4+ in the low spin state. On the basis of the measured results, the electronic states and the conduction mechanism are discussed.

Source: Journal of Applied Physics

DOI: 10.1063/1.4757632

Authors: Ryohei Takahashi, Ryuji Okazaki, Yukio Yasui, Ichiro Terasaki, Takaaki Sudayama, Hironori Nakao, Yuichi Yamasaki, Jun Okamoto, Youichi Murakami, Yoshinori Kitajima

Institutions: Nagoya University, High Energy Accelerator Research Organization, Institute of Materials Structure Science, Photon Factory

Language: English

Topic: Advanced Thermoelectric Materials and Devices

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: green

Funders: Japan Society for the Promotion of Science, Japan Science and Technology Agency, Advanced Low Carbon Technology Research and Development Program

Awards: Study of Local Electronic State and the Hybridized Orbital Order under Magnetic Field and Pressure by Resonant Soft X-ray and Neutron Scattering, Non-equilibrium electronic states near the Mott insulating phases

OpenAlex ID: W1557248793

FWCI: 0.522

Cites: 31

Cited by: 21

Related to: 10