the mössbauer spectra of nanoferrite materials such as ni0.25mn0.75fe2o4, co0.5mn0.5fe2o4 and ni0.4co0.6fe2o4 have been reported and the above materials were prepared by sol-gel combustion method using metal nitrates as source material and polyvinyl alcohol(pva) as agglomeration reducing agent. as the structural, thermal and magnetic properties (vsm) of the above ferrites have been published al...

The low coercivity of spinel ferrites is a significant barrier limiting their use in high-density magnetic recording applications. large magnitude the magnetocrystalline anisotropy rare earth group elements can lead to high field by doping with these elements. In this research, using hydrothermal method, Fe+3 cobalt ferrite was substituted Yb+3 make CoFe2-xYbxO4 x = 0, 0.025, 0.05, 0.075, and 0...

Transition metal ferrites, such as CoFe2O4 (CFO) and NiFe2O4 (NFO), have gained increasing attention potential materials for supercapacitors. Since chemical vapor deposition (CVD) offers advantages like interface quality to the underlying substrates possibility coverage of 3D substrates, two CVD processes are reported CFO NFO. Growth rates amount 150 200 nm h?1 yield uniform, dense, phase pure ...

In this work, size-controlled synthesis of nickel ferrite nanoparticles was achieved by the calcination a bimetallic (Fe/Ni) metal-organic framework (MOF). The MOF (Fe2Ni-MIL-88B) itself prepared two-step route. first step involved secondary building unit (SBU) reacting stoichiometric amounts Ni and Fe precursors with acetic acid. A ligand substitution reaction (terephthalate replaces acetate) ...

Aging heat treatments in maraging steels are fundamental to achieve the excellent mechanical properties required several industries, i.e., nuclear, automotive, etc. In this research, samples of 300 alloy were aged using a novel procedure that combines different steps with two atmospheres (nitrogen and water vapor) for hours. The oxidized surface layer was chemical, microstructural micromechanic...

Abstract We have investigated the Vanadium- (V) substituted Ni–Zn–Co ferrites where samples are prepared using solid-state reaction technique. The impact of V 5+ substitution on structural, magnetic, dielectric and electrical properties has been studied. XRD analysis confirms formation a single-phase cubic spinel structure. lattice constants calculated both theoretically experimentally along wi...

The growing process of a spinel-like oxide film can be obtained through different atmospheres; in this sense Air, O2, steam, and nitrogen atmospheres were used steps during the aging heat treatment at 490ºC maraging 300 350 alloys. oxidation layer produced under was chemically, microstructurally mechanically characterized by means advanced techniques. results showed (in both alloys) non-homogen...

CoNd x Fe (2− ) O 4 ( = 0.0–0.05) spinel ferrites are successfully synthesized by mechanical milling using solid‐state reaction. The effects of Nd 3+ ions on structural, microstructure, and magnetic microwave‐absorbing properties samples analyzed. X‐ray diffraction pattern shows a single‐phase cobalt ferrite for all compositions. Refinement the structure that an increase in concentration leads ...

Ferrites are promising materials for enabling solar-thermochemical cycles. Such cycles utilize solar-thermal energy to reduce the metal oxide, which is then re-oxidized by H2O or CO2, producing H2 or CO, respectively. Mixing ferrites with zirconia or yttria-stabilized zirconia (YSZ) greatly improves their cyclability. In order to understand this system, we have studied the behavior of iron oxid...