Synthesis, morphology and electrical properties of Co2+ substituted NiCuZn ferrites for MLCI applications

Crystal structure and peculiarities of microwave parameters of Co1−xNixFe2O4 nano spinel ferrites

“…56 This spatial shi results from the cation redistribution that occurs due to the substitution of Ni ions. 53 Consequently, L A-A , L B-B , and L A-B values diminish with a growing concentration of nickel, which is consistent with theoretical predictions based on relevant equations. Observations reveal a clear pattern: the value of L A-A consistently surpasses L B-B .…”

“…The theoretical value of the lattice parameter a Th was calculated for all CNFO compositions from the following formula: 52,53 a Th = 1.5396[( r A + r O ) + 1.732( r B + r O )]where r O is the oxygen ion radius.…”

“…The theoretical value of the lattice parameter a Th was calculated for all CNFO compositions from the following formula: 52,53 a Th = 1.5396…”

“…This can be explained by decreasing lattice strain, which usually contributes to increased crystallite size. 53 As the nickel content increases, a bigger Co 2+ ion (0.745 Å at the octahedral site and 0.580 Å at the tetrahedral site) is substituted by a smaller Ni 2+ ion (0.690 Å at the octahedral site and 0.550 Å at tetrahedral site) in the CNFO ferrites 54 Thus, there is a linear decrease in the lattice parameter and unit cell volume, with increasing Ni 2+ concentration, following the trend expected from Vegard's rule. 55 The calculated values of theoretical lattice parameters correlate well with the established (a Th ) and (a) values, which conrms the reliability of the proposed distribution of cations for the CNFO system.…”

Enhancement of magnetic and dielectric properties of low temperature sintered NiCuZn ferrite by Bi2O3–CuO additives

“…Many dopants, such as Bi 2 O 3 , CuO, V 2 O 5 , Co 2 O 3 , and combinations (B 2 O 3 -MoO 2 , Bi 2 O 3 -Nb 2 O 5 ), were introduced into NiCuZn ferrites to enhance their sintering and magnetic properties, but there has been no researches on dielectric properties of ferrites. [6][7][8][9][10][11][12] The Bi 2 O 3 and CuO were studied and found to be efficiently conducive to lowering the sintering temperature of ferrite. The Bi 2 O 3 is an excellent liquid-phase sintering aid that can lower temperature and promote grain growth.…”