Glassy rods of the multicomponent ferromagnetic Fe65.5Cr4Mo4Ga4P12C5B5.5 alloy were prepared by copper-mold casting technique under a protective argon atmosphere with diameters 1.5mm and 1.8 mm. As-cast samples examined non-isothermal analysis (DSC DTA) X-ray diffraction (XRD). The relatively high values for reduced glass transition temperature (Trg = 0.57) supercooled liquid region width (?Tx ? 60 K) indicate good forming ability (GFA) thermal stability undercooled relative to...

Powder mixture of 50 mass % barium titanate (BaTiO3) and iron (Fe) was prepared by solid-state reaction technique, i.e. ball milled in air for 60 min, 80 100 120 min 150 min. During mechanochemical activation it observed the powder transitsion to oxides. Depending on time content oxides FeO, Fe2O3 Fe3O4 varies. Simultaneously, with change activated system, magnetic properties as well. The XRD analysis samples shown that increase, oxide percentage increases to, whereby BaTiO3 a total sample...

To investigate the influence of spinel structure and sintering temperature on functional properties BaTiO3/NixZn1−xFe2O4 (x = 0, 0.5, 1), NiFe2O4, ZnFe2O4, Ni0.5Zn0.5Fe2O4 were in situ prepared by thermal decomposition onto BaTiO3 surface from acetylacetonate precursors. As-prepared powders additionally sintered at 1150 °C 1300 °C. X-ray powder diffraction (XRPD) scanning electron microscopy (SEM) coupled with dispersive spectroscopy (EDS) used for detailed examination phase composition...

The structural changes effect on functional properties of ribbon shaped samples the Fe81B13Si4C2 amorphous alloy during annealing process was investigated in this paper. Differential scanning calorimetry method has shown that crystallizes one stage, temperature range from room up to 700?C. Structural relaxation by sensitive dilatation nonisothermal and isothermal conditions. It been occurs two stages measuring thermal expansion at constant temperatures t1=420?C, t2 = 440?C t3 460?C. first...

In this study, the evolution of nanostructure on dc Joule heated Fe72Al5Ga2P11C6B4 metallic glass ribbons have been investigated. Heating power per square area (PS) was ranging between 0.8 to 7.1 W/cm2 in order get various stages relaxation or nanocrystallization. The crystallization starts after applying PS ? 4.35 and sample consist residual amorphous matrix, a magnetic crystalline component also non-magnetic (relative abundance Fe phase is about 35 %). XRD measurements show that samples...

In this study it was investigated influence of temperature and frequency on permeability, coercivity power loses Fe81B13Si4C2 amorphous alloy. Magnetic permeability measurements performed in nonisothermal isothermal conditions confirmed that efficient structural relaxation occurred at 663 K. This process two steps, the first one is kinetic second diffuse. Activation energies these processes are: Ea1 = 52.02 kJ/mol for Ea2 106.9 It shown after annealing K decrease about 30% therefore...

Mixtures of high purity powders 50 mass % Fe, 4 Pb, 3 Zr and 43 BaTiO3 were activated in a rotary ball mill for durations ranging from 30 min to 300 min. Samples then pressed sintered the air atmosphere 2 hours at 1200 °C. It was observed that pressing alone, i.e. without sintering, led decrease magnetization all samples, with process sintering decreasing it further, most dramatic drop 90.11 belonging sample 150 90 min, 180 subjected subsequent cycles heating Curie temperature 345.26 °C,...

The ferromagnetic Fe65.5Cr4Mo4Ga4P12C5B5.5 bulk metallic glass rods of 1.8 mm diameter were prepared by the copper-mold casting technique. As-quenched and successive furnace annealed samples examined thermal analysis (DTA), X-ray diffraction (XRD), thermomagnetic, coercivity, hardness measurements. wide supercooled liquid region DTx 57 K reduced transition temperature Trg 0.57 indicate enhanced forming ability high stability against crystallization. After third annealing at 673 most...

In this study, the magnetoimpedance effect in magnetically soft Fe89.8Ni1.5Si5.2B3C0.5 metallic glass ribbon samples with significant decrease atomic percentage of metalloids content (less than 10 at.%) was investigated.Thermal treatments were performed by stress-annealing technique up to 693 K/475 MPa/30 min.The critical frequency about 600 kHz observed as point initial increase ratio.Significant improvement magnetoimpedance-response reaching value ∆Z/Z = 25% after at K/130 min recorded...

The magnetoimpedance (MI) effect in magnetically soft Fe89.8Ni1.5Si5.2B3C0.5 metallic glass ribbons is studied this paper. As magnetic properties were determined by field induced anisotropy (and therefore domain structure), ribbon samples annealed under tensile stress order to enhance induction of transverse and improve effect. Stress-annealing (SA) technique up 420 0C/475 MPa/30 min. was used for tailoring electrical resistivity (ρ) permeability (μ), i.e. two material that classical skin...

The impact of amorphous Co80Ni20 alloy powder pressing pressure on magnetic properties was investigated. pressed at room temperature under pressures 560 MPa, 1100 MPa and 1300 MPa. Investigation conducted by susceptibility measurement in range from 290 K to 900 K. It has been determined that with a increase the rises. differential scanning calorimetry method showed crystallization process occurred two stages each stage followed change.

This paper investigates the thermal and magnetic properties of two iron based amorphous alloys with different Fe-content: Fe89.8Ni1.5Si5.2B3C0.5 Fe81B13Si14C2. The XRD results show that induced structural changes occur in temperature range 3000C - 8500C for alloy. appearance first crystallization peaks on DSC thermograms Fe81B13Si4C2, alloy is perceived already at 4500C. initial magnetization curves as-cast sample alloy, obtained frequencies 50 Hz, 400 Hz 1000 excellent match. maximum...

Fast cooling of 106 K/s, according to the melt-spinning method, led Fe73.5Cu1Nb3Si15.5B7 amorphous alloy formation. X-ray diffraction analysis method (XRD) showed that obtained is in state. The differential scanning calorimetry (DSC) has defined temperature interval crystallization process be from 510ºC 540ºC. same also been confirmed by measuring electrical resistivity dependence over temperature. heating sample 25ºC 600ºC, leads structural changes under thermal influence. Structural...

Multiferroic systems are attractive to the researches worldwide due diversity of existing applications, as well possible novel ones. In order contribute understanding processes that take place within structure such a system, we subjected it mechanochemical activation and thermal treatment. Powdery mixtures iron barium titanate in mass ratio 30% Fe 70% BaTiO3 were activated planetary ball mill for time duration 30 300 min subsequently sintered at 1200?C atmosphere air. During system undergoes...