This title appears in the Scientific Report :
2013
Please use the identifier:
http://hdl.handle.net/2128/16814 in citations.
Please use the identifier: http://dx.doi.org/10.1063/1.4813098 in citations.
Structure and thermoelectric properties of EuTi(O,N)3 ± δ
Structure and thermoelectric properties of EuTi(O,N)3 ± δ
After partial substitution of nitrogen for oxygen in EuTiO3, the crystal structure, thermoelectric properties, morphology, and electronic structure of the products were analyzed and compared with pristine EuTiO3. The space group of EuTi(O,N)3 ± δ was orthorhombic Pnma due to the tilt and rotation o...
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Personal Name(s): | Sagarna, L. (Corresponding author) |
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Rushchanskii, K. Z. / Maegli, A. / Yoon, S. / Populoh, S. / Shkabko, A. / Pokrant, S. / Ležaić, M. / Waser, R. / Weidenkaff, A. | |
Contributing Institute: |
Quanten-Theorie der Materialien; PGI-1 JARA-FIT; JARA-FIT Elektronische Materialien; PGI-7 |
Published in: | Journal of applied physics, 114 (2013) 3, S. 033701 - |
Imprint: |
Melville, NY
American Institute of Physics
2013
|
DOI: |
10.1063/1.4813098 |
Document Type: |
Journal Article |
Research Program: |
Frontiers of charge based Electronics |
Link: |
OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1063/1.4813098 in citations.
After partial substitution of nitrogen for oxygen in EuTiO3, the crystal structure, thermoelectric properties, morphology, and electronic structure of the products were analyzed and compared with pristine EuTiO3. The space group of EuTi(O,N)3 ± δ was orthorhombic Pnma due to the tilt and rotation of the anion octahedra, compared to cubic Pm3¯m of EuTiO3 (at room temperature). The thermoelectric properties of oxynitride polycrystalline bodies sintered in three different ways were investigated in the temperature range of 300 K < T < 950 K. The Seebeck coefficients (S) of the oxynitrides were lower compared with the oxide, and the electrical resistivities (ρ) were increased about one order of magnitude. The activation energies (E A) indicated a larger band gap of EuTi(O,N)3 ± δ when compared to the pristine EuTiO3 (∼1.3 eV compared to 0.98 eV). A morphological characterization by transmission electron microscopy and scanning electron microscopy illustrated intrinsic nanopores within the individual particles and weak grain-interconnections indicating poor intergrain electron transport. Ab initio calculations of the electronic structures confirmed a larger band gap of the distorted crystal structure of the oxynitride and showed a decrease of the density of states at the Fermi level, explaining the reduction of the measured S. |