Sr-substitution Effects on La-NiO3, Sol-Gel Synthesis, Structural and Electrical Properties | ||||
| Egyptian Journal of Chemistry | ||||
| Article 4, Volume 59, Issue 5, October 2016, Page 719-729 PDF (226.89 K) | ||||
| DOI: 10.21608/ejchem.2016.1446 | ||||
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| Abstract | ||||
| IN ORDER to investigate Sr-substitution effects on LaNiO3, LSN, …...properties, thermal analysis, x-ray diffraction, and scanning electron microscopy studies were used to characterize powder samples of La1-xSrxNiO3, x= 0, 0.3, 0.5, 0.8 and 1, prepared by the sol-gel route via the polymerized complex method. Electrical conductivity and dielectric properties of the different compositions were also done. Samples of the complex solutions of molar ratios La (Sr)/Ni/citric acid (CA)/ethylene glycol (EG) = 1:1:10:40, were heated at 130°C to reach a gel form, dried at 350°C, crushed to the precursor powder LSN, then final calcination was performed at 800°C/2hr in air according to thermal analysis results. Elemental analysis through the EDS spectroscopy confirms the compositions. Ultrafine, nanoparticle samples having perovskite (ABO3) tetragonal crystalline were formed except that of x=1, SrNiO3, which has a cubic one. The conduction mechanism changes from semi-conductive to metallic as Sr-incorporation increases and, σ seems to be temperature independent, while the dielectric values increase. | ||||
| Keywords | ||||
| SrLaNiO3; Perovskite; sol-gel; Characterization; electrical conductivity | ||||
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