Evolution of the magnetic properties during the thermal treatment of nanosize BaMFe11O19 (M=Fe, Co, Ni and Al) obtained through aerosol route

Magnetic and Mössbauer spectral studies of nano crystalline cobalt substituted magnesium ferrites (MgxCo1 − xFe2O4)

“…The frequency band near 555-565 cm −1 is assigned to tetrahedral clusters and confirms the presence of M-O stretching band in ferrites as suggested by Pradeep and Chandrasekaran [5]. The TEM micrograph of the as obtained samples shows well separated particles of size ∼6 nm as described in our earlier paper [6,7]. The micrographs for the annealed samples at 1,000 • C show that the particle size increases with annealing temperature.…”

“…The presence of broad doublet in the as obtained sample indicates the superparamagnetic nature of the sample. This broad doublet was fitted with the two sets of the doublets corresponding to the surface and internal region of the particles as described in our earlier paper [6,7]. The Mössbauer data after the least square fitting are given in Table 2.…”

Cation Distribution in Lithium Ferrite (LiFe5O8) Prepared via Aerosol Route

“…Nano particles of lithium ferrite (LiFe 5 O 8 ) were prepared via aerosol route using a setup described in our earlier papers [12][13][14]. The desired proportions of lithium and iron nitrates were weighed and dissolved in water to prepare 5 x 10 -2 M solutions.…”

Rietveld refinement, electrical properties and magnetic characteristics of Ca–Sr substituted barium hexaferrites

“…Various properties of Ba hexaferrites have been studied in the past by several groups by replacing its Fe 3+ ions and Ba 2+ ions with Sm 3+ , Mn 3+ , Ni 2+ , Al 3+ ions etc. and with various bivalent-tetravalent cation combinations such as Sn-Zn, Zr-Ni, Zn-Ti [10][11][12][13]. Most of the researchers worked on Ba or Sr hexaferrites and Sr-doped Ba hexaferrites.…”