Nanocomposites and nanomaterials

Structural and Mossbauer studies of nanoscale cobalt substituted lithium iron spinel
Kaykan L.S.1, Mazurenko J.S.2, Hrubiak A.B.1
1 G.V. Kurdyumov Institute for Metal Physics, N.A.S. of Ukraine, 36 Academician Vernadsky Boulevard, UA-03142 Kyiv, Ukraine
E-mail: email.of. larysa.kaykan@gmail.com
2 Vasyl Stefanyk Precarpathian National University, 57 Shevchenko str., 76018 Ivano-Frankivsk, Ukraine.

The lithium ferrite of the spinel type (AB2O4), Li0.5Fe2.5O4/LiFe5O8 is a magnetic material of considerable scientific and technological interest due to its relatively high Curie temperature (TC), high magnetization saturation (MS), low magnetic losses, excellent chemical stability and high resistance [1]. Compared with other ferrite materials, lithium ferrites have one important feature: because lithium ions combining with Fe3+ ions, as a result, the concentration of Fe2+ ions decreases, which makes the material's resistance very high.
	Is, mm/s	Qs, mm/s	H, kOe	S,%	G, mm/s	
I sextet	0.26	0.02	492.3	41.4	0.40	
II sextet	0.36	-0.03	512.0	38.9	0.44	
III sextet	0.38	-0.07	465.4	13.8	0.81	
I doublet	0.35	0.79	-	4.7	0.48	
II doublet	0.32	2.52	-	1.1	0.21	
The paper presents the results of the synthesis of cobalt-substituted lithium ferrite nanoparticles at various pH values obtained by sol-gel method using citric acid as a chelating agent. Also studied the effect of pH change on structure, morphology and electrical properties of synthesized nanoparticles. The obtained nanoparticles investigated by XRD methods, Mössbauer spectroscopy, SEM, EDAX and impedance spectroscopy to detect the effect of pH on changes in structure, morphology and electrical properties of properties.
1.	Hyuk Su Han, Kyoung Ryeol Park. Effect of Fe incorporation on cation distributions and hopping conductions in Ni-Mn-Co-O spinel oxides // J. Alloy Compd.-2018.-732.-Р. 486-490