| Autor: |
Murthy, P. S. Ramu, Salkar, Kapil |
| Zdroj: |
Journal of Materials Science: Materials in Electronics; Nov2023, Vol. 34 Issue 31, p1-15, 15p |
| Abstrakt: |
SrLaLiTe1-xZnxO6; x = 0,0.1,0.2,0.3 were investigated for their structural, optical and dielectric properties. The compositions were found to be monoclinic with the P21/n space group. Rietveld refinement of the X-ray data revealed a change in the cell volume and monoclinic cell angle β. The x = 0 composition exhibited the ordered double perovskite structure SrLaLiTeO6 with Li+ and Te6+.Tolerance factor and tilting angle calculations indicated a change in symmetry due to tilt of the octahedra and bending of Li–O–Te/Zn. FTIR studies confirmed that molecular bonds are present in the double perovskite structure. UV–visible reflectance measurements revealed a drop in the band gap energy indicating that the doped compositions have a better ability to conduct. SEM and EDX studies showed all compositions having an almost uniform distribution in terms of their shape, particles were grouped together, and confirmation of the element composition. Impedance spectroscopy studies indicated that the AC conductivity increases as the frequency increases. Single dielectric relaxation is also seen to be present in all compositions due to a decline in the grain resistance Rg. Cole–Cole plots revealed a non-Debye type of relaxation phenomena due to imperfections in all compositions. Dielectric studies indicated a decrease in the dielectric constant and loss with increasing frequency due to a drop in net polarization. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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