Structure, surface and broadband impedance spectroscopy of Li4Ti5O12 based ceramics with Nb and Ta
| Autor: | J. Miškinis, Kuan-Zong Fung, Antanas Feliksas Orliukas, V. Venckutė, M. Lelis, V. Kazlauskienė |
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| Rok vydání: | 2015 |
| Předmět: |
Diffraction
Materials science Binding energy Analytical chemistry General Chemistry Atmospheric temperature range Condensed Matter Physics Dielectric spectroscopy X-ray photoelectron spectroscopy Electrical resistivity and conductivity visual_art visual_art.visual_art_medium General Materials Science Ceramic Electrical impedance |
| Zdroj: | Solid State Ionics. 271:34-41 |
| ISSN: | 0167-2738 |
| DOI: | 10.1016/j.ssi.2014.09.037 |
| Popis: | The structural investigation of the Li4Ti5O12 (LTO), Li4Ti4.95Nb0.05O12 (LTO + Nb) and Li4Ti4.95Ta0.05O12 (LTO + Ta) powders was conducted by X-ray diffraction (XRD) in temperature range (300–1270) K. These compounds have cubic spinel-type structure in the investigated temperature range. Ceramic samples were sintered for X-ray photoelectron spectroscopy (XPS) and impedance spectroscopy study. Binding energies of Ti 2p and O1s core levels XPS on the surfaces of the ceramics have been investigated at room temperature. Two and four probe voltmeter–ammeter methods were used for the measurements of electrical impedance in the frequency range 10 Hz–1 MHz. Coaxial waveguide technique was used for the investigation of impedance spectra in the frequency range from 1 MHz to 3 GHz. Electrical properties of the ceramics were studied in the temperature interval (300–780) K. |
| Databáze: | OpenAIRE |
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