Impedance spectroscopy studies on samarium and sodium substituted strontium bismuth titanate (SBTi)
| Autor: | U. Ravikiran, P. Sarah, G. Rajashekhar, Elizabeth Zacharias |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Scanning electron microscope Process Chemistry and Technology Bismuth titanate Analytical chemistry Sintering 02 engineering and technology Conductivity Atmospheric temperature range 021001 nanoscience & nanotechnology 01 natural sciences Grain size Surfaces Coatings and Films Electronic Optical and Magnetic Materials Dielectric spectroscopy chemistry.chemical_compound chemistry 0103 physical sciences Materials Chemistry Ceramics and Composites Grain boundary 0210 nano-technology |
| Zdroj: | Ceramics International. 45:15188-15198 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2019.05.003 |
| Popis: | Sr 1-x Sm x Na x Bi 4 Ti 4 O 15 lead-free piezoelectric ceramics are prepared by solid-state sintering method using high energy Ball- Mill and ground for 10 h. The single phase of the compound is confirmed by X-ray Diffraction and highest intensity peak (1 1 0) is observed at 30°. Diffraction peaks shifted towards higher angles with an increasing concentration of Sm 3+ and Na 1+ of SBT. Grains orientation and grain size are analyzed by Scanning Electron Microscope. Temperature and frequency dependent AC conductivity studies are carried out using impedance spectroscopy in the temperature range of 30 °C–650 °C using Wayn-Kerr LCR meter. At lower frequencies, conductivity is independent of frequency. The variation of Z″ with frequency shows peaks shifting towards higher frequencies with an increase of temperature. The resistance of grains (R g ), grain boundaries (R gb ) are calculated and it is found that grain resistance is greater than grain boundary resistance (R g > R gb ). Relaxation times of grain and grain boundaries are calculated. |
| Databáze: | OpenAIRE |
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