Preferential occupancy of Ca2+ dopant in La1-x Ca x InO3-δ (x = 0–0.20) perovskite: structural and electrical properties
- 232 Downloads
Ca-doped LaInO3 (LCI) has been synthesized by conventional solid-state reaction method. The structural features were investigated by X-ray diffraction, Raman spectroscopy and X-ray photoelectron spectroscopy. The structural investigation indicated that Ca2+ dopants occupy both A- and B-sites in ABO3 (La1-x In x O3-δ ). The solid solubility limit has been observed up to x = 0.10 for La1-x Ca x InO3-δ system. In addition, the Raman band softening has been observed with Ca-doping. The impedance spectroscopy shows that 10 mol% of Ca-doped LaInO3 possesses the highest conductivity of the order of 1.64 mS cm−1 at 700 °C among all investigated samples. The activation energy of doped samples lies within the range of 0.69–0.86 eV, which indicates that the conductivity in the reported samples is mainly contributed by ion transportation. SEM analysis supports the well-packed grains in the sintered samples.
KeywordsCeramics X-ray diffraction Raman spectroscopy Electron microscopy Electrical conductivity Site occupancy
The financial help for this study was provided by Department of Science and Technology (DST), New Delhi, India, through the letter no. SR/S2/CMP-0035/2011. The authors are thankful to Prof. Prabhakar Singh and Mr. Praveen Kumar, Department of Applied Physics, IIT BHU, Varanasi, India, for their help in ac conductivity measurements. The authors are also thankful to Mrs. Shivani Sood, Department of Physics, NIT-Kurukshetra, India, for her help in SEM measurements. The authors are grateful to Prof. T. Ishihara and his team, Department of Applied Chemistry, Faculty of Engineering, Kyushu University, Japan, for providing ion transport number measurement facility in their lab.
- 9.Ranlov J (1995) PhD Thesis, Riso-R-796(EN), Riso National Laboratory, DenmarkGoogle Scholar
- 23.Gentili PL, Penconi M, Costantino F, Sassi P, Ortica F, Rossi F, Elisei F (2010) Structural and photophysical characterization of some La2xGa2yIn2zO3 solid solutions, to be used as photocatalysts for H2 production from water/ethanol solutions. Sol Energy Mater Sol Cells 94:2265–2274CrossRefGoogle Scholar
- 34.Gan J, Lu X, Wu J, Xie S, Zhai T, Yu M, Zhang Z, Mao Y, Wang SCI, Shen Y, Tong Y (2013) Oxygen vacancies promoting photoelectrochemical performance of In2O3 nanocubes. Sci Rep 3:1021–1027Google Scholar