| Autor: |
Zavjalov, A. P., Lyubas, G. A., Sharafutdinov, M. R., Kriventsov, V. V., Kosyanov, D. Yu. |
| Zdroj: |
Journal of Surface Investigation: X-Ray, Synchrotron & Neutron Techniques; Jun2023, Vol. 17 Issue 3, p647-651, 5p |
| Abstrakt: |
The paper presents the results of studies of SrTiO3–TiO2 biphase ceramics, which was previously proposed as a promising n-type thermoelectric material, carried out using synchrotron radiation techniques at the research equipment of the Shared Research Center "Siberian Synchrotron and Terahertz Radiation Center". In particular, the in-situ heating X-ray diffraction method demonstrated that the reaction between the powder components SrCO3 (strontianite) and TiO2 (anatase) to produce SrTiO3 (tausonite) was not the driving force in producing ceramics by spark plasma sintering of the reaction mixture. For two spectral methods, X‑ray luminescence and XANES spectroscopy, the spectrum of biphase ceramics was compared with the model spectrum obtained from the spectra of monophase ceramics as comparison samples. The method of X-ray luminescence revealed a shift to the high-energy region and a narrowing of the spectrum of biphase ceramics, which may indicate dimensional quantization (the presence of two-dimensional electron gas) in the system. The XANES spectrum of biphase ceramics reveals changes in the region in which its shape may significantly depend on the symmetry of the nearest Ti4+ atoms. However, it is difficult to interpret these data without numerical simulation. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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