Effect of calcination temperature on the physical properties of LiFe 5 O 8 nanostructures
Advanced Powder Technology, ISSN: 0921-8831, Vol: 30, Issue: 5, Page: 952-960
2019
- 34Citations
- 15Captures
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Article Description
The structural properties of LiFe 5 O 8 nanostructures, which were synthesized using a thermal treatment method, were investigated using different characterization methods. The XRD, FESEM and TEM results showed a phase transition from uncompleted α-LiFe 5 O 8 and β-LiFe 5 O 8 phases to completed α-LiFe 5 O 8 phase when the growth calcination temperature shifted from 873 to 973 K. The crystallization was completed at 973 K, revealed by the absence of organic absorption bands in the FT-IR spectra. The results of band gap energy which were studied by UV–vis spectroscopy indicated that when calcination temperature increased, the appraised band gap energy of LiFe 5 O 8 nanostructures decreased. Laser Raman analysis was used to determine the peaks of the synthesized LiFe 5 O 8 nanostructures accurately and to differentiate between the α-LiFe 5 O 8 and β-LiFe 5 O 8 phases around 217 cm −1. The results of a vibrating sample magnetometer (VSM) indicated that the magnetic properties differed between these nanostructures so that saturation magnetization and coercivity increased when the calcination temperature increased. The obtained results from electron paramagnetic resonance (EPR) spectroscopy demonstrated that as the growth calcination temperature shifted from 673 to 873 K, the results of g value and ΔH pp increased up to the maximum value and then reduced for calcined sample at 973 K.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0921883119300305; http://dx.doi.org/10.1016/j.apt.2019.02.009; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85062006174&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S0921883119300305; https://dx.doi.org/10.1016/j.apt.2019.02.009
Elsevier BV
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