CoFe 2 O 4 magnetic ceramic derived from gel and densified by spark plasma sintering

The effect of agarose content on the morphology, phase evolution, and magnetic properties of CoFe2O4 nanoparticles prepared by sol‐gel autocombustion method

“…Furthermore, the increasing in H c values from ~800 to ~1100 Oe is attributed from decreasing from crystallite size from 50 to 20 nm. The obtained magnetic properties in this research are compared with the values of other references in Table . As it is observed, there is a good conformity between the results obtained from different references and this study.…”

Probing the dielectric, piezoelectric and magnetic behavior of CoFe2O4/BNT-BT0.08 composite thin film fabricated by sol-gel and spin-coating methods

“…Thus a dependence of the type:is characteristic for a space charge-limited conduction (SCLC) mechanism 40,41 . Alternatively, a dependence of the type:is characteristic for a Schottky-type conduction mechanism 40,42 , related to the potential barrier created by the different Fermi levels of dielectric and metal. In equation (3), Φ is the height of the Schottky barrier height, a is a material constant and k is the Boltzmann constant 40,41 .…”

“…The new structure was calcined at 800 °C for 5 min, in oxygen to crystallize the layer of BNT-BT 0.08 . The precursor sols of CoFe 2 O 4 and BNT-BT 0.08 were prepared by sol-gel technique as described in our previous works 42,43 , respectively. According to these reports, CoFe 2 O 4 precursor sol was prepared from cobalt acetate (Co(CH 3 CO 2 ) 2 ·4H 2 O, 99.995%, Sigma-Aldrich), iron nitrate (Fe(NO 3 ) 3 ·9H 2 O, 99.99%, Sigma-Aldrich), citric acid (C 6 H 8 O 7 , 99%, Sigma-Aldrich), ethanol, acetic acid and distilled water.…”

Structural, Dielectric and Electrical Properties of Sol-Gel Auto-Combustion Technic of CuFeCr0.5Ni0.5O4 Ferrite

“…Several reports are available in the literature on magnetic and electrical proprieties of many Spinel Ferrites (SF) types was investigated nanocrystalline NiFe2O4 [5],Ni0.65Zn0.35Fe2-xMnxO4 [6],NixCo1-xFe2O4 [7], spinel MFe2O4(M= Zn, Cu, Ni, and Co) ferrite [8]. Among many ferrites, Spinel Ferrites (SF) attracts much attention due to their high coercivity, magneto-crystalline anisotropy, moderate saturation magnetization, wear resistance, electrical insulation, chemical and physical and thermal stability and high Curie temperature [9][10][11]. In this regard, spinel ferrites were prepared by a great number of methods: sol-gel [12,13], hydrothermal [14], microemulsion [15], polyol [16], combustion [17], chemical co-precipitation [18,19], solvothermal [20], solid-state method [21] and solution combustion [22][23][24][25][26].Each synthesis method, the structure and properties of the obtained device was controlled by the annealed temperature.…”