Infrared Spectroscopy and Elastic Properties of Nanocrystalline Mg–Mn Ferrites Prepared by Co-Precipitation Technique

Abstract

Nanoparticles having particle size in the range 25-40 nm for compositions x = 0.0, 0.2, 0.4 and 0.5 of Mg(x)Mn(1-x)Fe2O4 spinel ferrite system have been prepared by chemical co-precipitation route. The microstructure, infrared spectral and elastic properties have been studied by means of energy dispersive analysis of X-rays (EDAX), transmission electron microscopy (TEM), X-ray diffraction (XRD) and infrared spectroscopic (IR) measurements, before (W) and after high temperature annealing A(w). The force constants for tetrahedral and octahedral sites determined by infrared spectral analysis, lattice constant and X-ray density values by X-ray diffraction pattern analysis; have been used to calculate elastic constants. The magnitude of force constant and elastic moduli for nanocrystalline W-samples are found to be larger as compared to coarse grained A(w)-samples. The results have been explained in the light of redistribution of cations and as a result change in mean ionic charge for such cationic sites, elastic energy and grain size reduction effect of Nanoparticles.

Effects of different sintering temperatures on thermal, physical, and morphological of SiO2-Na2O-CaO-P2O5 based glass-ceramic system from vitreous and ceramic wastes

“…2. It is has been established that materials with a cubic crystal structure are prone to grow into a spherical shape to minimize surface tension [17]. This result was in agreement with Omer Kygili finding which showed the same main composition [18].…”

Cation distribution and Mössbauer spectral studies of Mg0.2Mn0.5Ni0.3InxFe2−xO4 ferrites (x=0.0, 0.05 and 0.10)

“…It is well know that materials with a cubic crystal structure are prone to grow into a spherical shape to minimize surface tension [12]. The particle size estimated from TEM is slightly less than particle size estimated from XRD using Scherrer's formula, Table 1.…”

Effect of In3+ ions doping on the structural and magnetic properties of Mg0.2Mn0.5Ni0.3InxFe2−xO4 spinel ferrites

“…By analyzing TEM and XRD one can have almost complete picture of particle size, their distribution and morphology. It is well know that materials with a cubic crystal structure are prone to grow into a spherical shape to minimize surface tension [25]. Value of 'd' the distance between adjacent planes was found from different equations using l¼1.54060Å as given in (Table 2).…”

“…When solubility limit is achieved no further indium is dissolved in spinel lattice and indium ions accumulate to grain boundaries combining with Fe to produce Fe 2 O 3 and form thin insulating layer around the grains. Appearance of secondary phase on grain boundaries may suppress grain growth by limiting grain boundary mobility [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]. Formation of second phase has also been reported when rare earth metal cations were substituted in MnZn ferrites [31].…”