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Synthesis, microstructure and electrical properties of nanocrystalline calcium doped lanthanum orthoniobate
Abstract
The single phase lanthanum orthoniobate with tetragonal structure has been synthesized by the means of mechanosynthesis method. The studies have shown the crystal structure of La0.98Ca0.02NbO4 depends on the synthesis stage. The samples were predominantly in the tetragonal phase with a trace amount of the monoclinic phase. The SEM studies of morphology and microstructure have shown nanocrystallinity of the materials. The Raman studies showed the significant difference between the Raman spectra of nano- and microcrystalline La0.98Ca0.02NbO4. A decrease of Debye temperature, shown a change of thermal properties due to the presence of nano-sized particles in La0.98Ca0.02NbO4. Electrical characterization results suggest the protons are predominant charge carries in the material for the whole measured range of temperature and shows the total conductivity value of 4.0 × 10−5 S cm−1 at 600 °C in wet air. The calculated activation energies were equal to (0.81 ± 0.04) eV under dry and (0.73 ± 0.06) eV under humidified conditions. That indicates that nanostructuring was successfully stabilized the high-temperature tetragonal phase.
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Authors (11)
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Andrzej Morawski
- Instytut Wysokich Ciśnień PAN w Warszawie
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Miroslaw Sawczak
- Instytut Maszyn Przepływowych PAN w Gdańsku
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Details
- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
-
JOURNAL OF SOLID STATE CHEMISTRY
no. 270,
pages 601 - 607,
ISSN: 0022-4596 - Language:
- English
- Publication year:
- 2019
- Bibliographic description:
- Miruszewski T., Winiarz P., Dzierzgowski K., Wiciak K., Zagórski K., Morawski A., Mielewczyk-Gryń A. D., Wachowski S. L., Strychalska-Nowak J., Sawczak M., Gazda M.: Synthesis, microstructure and electrical properties of nanocrystalline calcium doped lanthanum orthoniobate// JOURNAL OF SOLID STATE CHEMISTRY. -Vol. 270, (2019), s.601-607
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.jssc.2018.12.034
- Sources of funding:
- Verified by:
- Gdańsk University of Technology
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