Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5459473 | Journal of Alloys and Compounds | 2017 | 47 Pages |
Abstract
Nanocrystalline lithium magnesium borate (LiMgBO3) powders were synthesized by a Pechini process. Thermal behavior of the polymeric intermediate of LiMgBO3 sample was studied by TG-DTA. Structure and the local structural coordination of the as-prepared and calcined polymeric intermediate at 750 °C of LiMgBO3 sample were investigated by FT-IR and 7Li & 11B magic angle spinning - nuclear magnetic resonance (MAS-NMR) measurements respectively. XRD results confirm the formation of the pure nanocrystalline monoclinic phase of the LiMgBO3 sample prepared at 750 °C. The BET surface area of the calcined polymeric intermediate of LiMgBO3 sample is found to be 60.48 m2g-1. The observed SEM micrographs of the LiMgBO3 sample showed the formation of agglomerated sheet-like morphology particles and the existence of Mg and O elements in LiMgBO3 are confirmed from the SEM-EDX spectral result. The band gap energy of LiMgBO3 sample is evaluated and it was found to be 3.64 eV. From the analysis of the measured impedance data, at different frequencies and temperatures, the evaluated electrical conductivity of LiMgBO3 sample was found to be 9.706 Ã 10â5 S cmâ1 at 200 °C. From the temperature dependence of conductivity (log ÏT vs. 1000/T) plot of the LiMgBO3 sample, the evaluated activation energy (Ea) for the migration of the charge carrier was found to be 0.62 eV. The measured impedance data and the LiMgBO3 sample pellet dimensions were used for calculating AC conductivity (Ïac), dielectric (εâ², εâ³, tan δ), electric modulus (Mâ² and Mâ³) data and were analyzed to find out the electrical and dielectric properties of the LiMgBO3 sample.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Kamatam Hari Prasad, S. Subramanian, T.N. Sairam, G. Amarendra, E.S. Srinadhu, N. Satyanarayana,