Optical, thermal, electrical and morphological study of La 1-x Ca x GaO 3-δ (x=0, 0.05, 0.10, 0.15 and 0.20) electrolyte
| Autor: | Kulvir Singh, Kapil Sood, Om Prakash Pandey, Suddhasatwa Basu |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Diffraction
Materials science Scanning electron microscope Analytical chemistry 02 engineering and technology Electrolyte Conductivity 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences 0104 chemical sciences Dielectric spectroscopy Ultraviolet visible spectroscopy Materials Chemistry Ceramics and Composites 0210 nano-technology Perovskite (structure) |
| Zdroj: | Journal of the European Ceramic Society. 36:3165-3171 |
| ISSN: | 0955-2219 |
| DOI: | 10.1016/j.jeurceramsoc.2016.05.003 |
| Popis: | La1-xCaxGaO3-δ (x = 0, 0.05, 0.1, 0.15 and 0.2) perovskites have been prepared by solid state method in which solid solubility limit was up to x = 0.1. The structural modification in the parent LaGaO3 structure with Ca-doping is discussed using X-ray diffraction study. In addition, the optical band-gap change and confirmation of disorder was investigated using diffused reflectance UV–vis spectral analysis. Lattice expansions and intermediate phase transformations with the increase in Ca-content and temperature are verified using dilatometric study. The electrochemical properties of these materials in air are characterized using impedance spectroscopy measurements. The morphological features are investigated using scanning electron microscopy. La0.90Ca0.10GaO3-δ as an electrolyte shows highest conductivity among the investigated LCG systems in intermediate temperature range (600–800 °C). Beyond 10 mol% of Ca-content in LCG system, the conductivity decreases due to formation of secondary phases blocking the grain interface region. |
| Databáze: | OpenAIRE |
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