Synthesis and magnetic characterization of nickel ferrite nanoparticles prepared by co-precipitation route

Structural, magnetic and thermal properties of one-dimensional CoFe2O4 microtubes

“…This results in a decrease of the saturation magnetization [30,35]. Namely, with the increase of calcination temperatures, the variety of particle size and degree of crystallinity would always result in an increase of the saturation magnetization while the exchange interaction in its decrease [32,35]. It appears that the combined effect of exchange interaction and crystal size levels out a monotonous increase of saturation magnetization in these samples.…”

“…The exchange interaction between the cobalt ferrite phase and impurity in ferrites decreases as the amount of impurity gradually decreases and finally disappears at higher calcination temperatures. This results in a decrease of the saturation magnetization [30,35]. Namely, with the increase of calcination temperatures, the variety of particle size and degree of crystallinity would always result in an increase of the saturation magnetization while the exchange interaction in its decrease [32,35].…”

Sinterização por micro-ondas de ferrita de níquel sintetizada pelo método Pechini

“…Convencionalmente, os pós de NiFe 2 O 4 são obtidos por reação em estado sólido de mistura de óxidos, mas grandes esforços têm sido realizados no desenvolvimento de métodos alternativos de síntese química visando o controle das características do pó, principalmente pureza, morfologia e tamanho médio das partículas. Na síntese especificamente de ferritas de níquel, vários métodos de síntese têm sido utilizados, entre eles, o citrato gel [6], coprecipitação [7,8], reação por combustão [4,[9][10][11], Pechini [12], e sol-gel [8]. Entre os métodos de síntese mencionados, o método Pechini permite preparar pós com alta pureza, boa homogeneidade em escala atômica, e tamanho médio de partículas na escala nanométrica [12].…”

Hydrothermal Synthesis of Carbon Nanotube/Nickel Ferrite Nanocomposites

“…NiFe2O4 nanoparticles have been successfully prepared by a variety of methods such as hydrothermal synthesis [4][5][6][7], coprecipitation [8,9], solgel methods [10][11][12], combustion [13], and shock wave methods [14]. Recently, NiFe2O4-based magnetic nanocomposites have attracted increasing interest because of their unique properties and potential applications.…”