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Beed, India

Mane D.R.,Balbhim College | Patil S.,Balbhim College | Birajdar D.D.,Balbhim College | Kadam A.B.,Jawahar Mahavidyalaya andoor | And 2 more authors.
Materials Chemistry and Physics

Li0.5CrxFe2.5-xO4 powders with fine sized particles were successfully synthesized by sol-gel auto combustion, using lithium nitrate, ferric nitrate, chromium nitrate, and citric acid as the starting materials. The process takes only a few minutes to obtain as-prepared Cr-substituted lithium ferrite powders. The resultant powders were annealed at 600 °C for 4 h and investigated by thermogravimeter/differential thermal analyzer (TG/DTA), X-ray diffractometer (XRD) and vibrating sample magnetometer (VSM). Lattice parameter, bulk density and particle size are found to decrease with increasing Cr concentration, whereas X-ray density and porosity showed an increasing trend with the Cr content. Cation distribution indicates that the chromium ion occupy octahedral B-site. The magnetic moments calculated from Neel's molecular field model are in agreement in the experiment result, which indicates that the saturation magnetization decreases linearly from 37.36 to 4.27 emu/g with increasing Cr3+ content. However, coercivity, it increases with the Cr3+ substitution. © 2010 Elsevier B.V. All rights reserved. Source

Aghao A.K.,Balbhim College | Janrao D.M.,J E S College | Vibhute P.K.,Balbhim College
International Journal of ChemTech Research

Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) Complexes of 3-((3-hydroxyphenylImino) methyl)quinoxalin-2-ol (HIMQ) has been prepared and characterized by elemental analysis, Conductivity measurement, Magnetic property, Infra Red spectrum, electronic spectrum, Thermal analysis on the basis of spectral data (HIMQ) deprotonates to give monobasic ONO donor and binds to Cu(II) and Zn(II) in tetradentate fashion and to Mn(II), Ni(II), Co(II) in hexadentate fashion. The molar conductivity data revealed that all complexes are in non ionic nature. © 2015, International Journal of ChemTech Research. All right reserved. Source

Birajdar A.A.,SMP College | Shirsath S.E.,Vivekanand College | Kadam R.H.,Materials Research Laboratory | Patange S.M.,Materials Research Laboratory | And 2 more authors.
Ceramics International

Series of the ferrite samples with a chemical formula Ni 0.7Zn 0.3Cr xFe 2-xO 4 (x = 0.0-0.5) were prepared by a sol-gel auto-combustion method and annealed at 600 °C for 4 h. The prepared samples have the cubic spinel structure with no impurity phase. As the Cr 3+ content x increases, the unit cell dimensions decrease with an increase in Cr 3+ content x. The crystallite size is decreases from 37 nm to 21 nm as the Cr 3+ content increases from x = 0.0 to 0.5. Resistivity increases whereas dielectric constant decreases with an increase in Cr 3+ content x. Maxima in the dielectric loss tangent versus frequency appear when the frequency of the hopping charge carriers coincides with the frequency of the applied alternating field. Dielectric constant and dielectric loss tangent increases with increase in temperature. Saturation magnetization of sintered samples showed higher values as compared to as-prepared sample. Curie temperature deduced from AC susceptibility data decreases with increasing x. © 2011 Elsevier Ltd and Techna Group S.r.l. Source

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