scholarly journals Modulating the magnetic properties of BiFeO3 by addition of Ba5TbTi3V7O30

2020 ◽  
Vol 14 (4) ◽  
pp. 277-281
Author(s):  
Hage Doley ◽  
Pratap Swain ◽  
Anuradha Panigrahi
Keyword(s):  
Magnetic Properties ◽  
Magnetic Measurements ◽  
Weak Ferromagnetism ◽  
Ceramic Composites ◽  
Remnant Magnetization ◽  
Vibrating Sample Magnetometer ◽  
Solid State Reaction Technique ◽  
Xrd Study ◽  
Average Grain Size ◽  
Scanning Electron

xBiFeO3-(1-x)Ba5TbTi3V7O30 (xBFO-BTTV) ceramic composites with different x values were prepared by high temperature solid state reaction technique and sintering at 1073K. The formation of composite structure consisting of BFO and BTTV phases was confirmed by XRD study. Surface morphology was studied by scanning electron microscope (SEM) and shows that structure with high density was obtained in the composite 0.3BFOBTTV whereas the average grain size increases by increasing x, i.e. by increasing amount of BiFeO3 in the system. Magnetic measurements were done in a wide temperature range, i.e. from 10 to 350K, by vibrating sample magnetometer (VSM) and showed that the magnetization changes by changing the value of x in the composite. BiFeO3 is antiferromagnetic in nature with weak ferromagnetism. Addition of Ba5TbTi3V7O30 enhances magnetic properties of the composite and maximal coercivity and remnant magnetization are obtained in the composite 0.7BFO-BTTV.

scholarly journals Dielectric and magnetic properties of Ba-, La- and Pb-doped Bi0.8Gd0.1M0.1Fe0.9Ti0.1O3 perovskite ceramics

2014 ◽  
Vol 04 (02) ◽  
pp. 1450010 ◽  
Author(s):  
Radheshyam Rai ◽  
M. A. Valente ◽  
Anoop Kumar Shukla ◽  
Seema Sharma ◽  
Andrei L. Kholkin
Keyword(s):  
Magnetic Properties ◽  
Magnetic Measurements ◽  
Ferroelectric Properties ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
Solid State Reaction Technique ◽  
X Ray ◽  
Ceramic Samples ◽  
Perovskite Ceramics ◽  
Pb Substitution

The multiferroic Bi 0.8 Gd 0.1 M 0.1 Fe 0.9 Ti 0.1 O 3, (where M = Ba (DB), La (DL) and Pb (DP)) has been synthesized by using solid-state reaction technique. Effects of Ba , La and Pb substitution on the structure, electrical and ferroelectric properties of Bi 0.8 Gd 0.1 M 0.1 Fe 0.9 Ti 0.1 O 3 samples have been studied by performing X-ray diffraction, dielectric and magnetic measurements. The crystal structures of the ceramic samples have a tetragonal phase. The vibrating sample magnetometer (VSM) measurement shows a significant change in the magnetic properties of Ba -doped Bi 0.8 Gd 0.1 M 0.1 Fe 0.9 Ti 0.1 O 3 as compared to La - and Pb -doped ceramics. It is seen that coercive field (H C ) and remanent magnetization (M R ) increases with Ba -doped ceramics but decreases for La - and Pb -doped ceramics.

scholarly journals The Influence of Annealing Temperature on the Structure and Magnetic Properties of Nanocrystalline BiFeO3 Prepared by Sol–Gel Method

2021 ◽  
Author(s):  
T. Pikula ◽  
T. Szumiata ◽  
K. Siedliska ◽  
V. I. Mitsiuk ◽  
R. Panek ◽  
...  
Keyword(s):  
Grain Size ◽  
Magnetic Properties ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Weak Ferromagnetism ◽  
X Ray Diffraction ◽  
Gel Method ◽  
Sol Gel Method ◽  
Average Grain Size ◽  
Spin Cycloid

AbstractIn this work, BiFeO3 powders were synthesized by a sol–gel method. The influence of annealing temperature on the structure and magnetic properties of the samples has been discussed. X-ray diffraction studies showed that the purest phase was formed in the temperature range of 400 °C to 550 °C and the samples annealed at a temperature below 550 °C were of nanocrystalline character. Mössbauer spectroscopy and magnetization measurements were used as complementary methods to investigate the magnetic state of the samples. In particular, the appearance of weak ferromagnetic properties, significant growth of magnetization, and spin-glass-like behavior were observed along with the drop of average grain size. Mössbauer spectra were fitted by the model assuming cycloidal modulation of spins arrangement and properties of the spin cycloid were determined and analyzed. Most importantly, it was proved that the spin cycloid does not disappear even in the case of the samples with a particle size well below the cycloid modulation period λ = 62 nm. Furthermore, the cycloid becomes more anharmonic as the grain size decreases. The possible origination of weak ferromagnetism of the nanocrystalline samples has also been discussed.

scholarly journals Evolution of the Structural and Magnetic Properties of Bulk Fe61Co10B20W1Y8−XPtx Alloys through the Partial Substitution of Pt for Y

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4962
Author(s):  
Pawel Pietrusiewicz ◽  
Marcin Nabiałek ◽  
Bartłomiej Jeż
Keyword(s):  
Magnetic Properties ◽  
Small Addition ◽  
Partial Substitution ◽  
Vibrating Sample Magnetometer ◽  
Chemical Formula ◽  
X Ray ◽  
Saturation Magnetisation ◽  
Structural And Magnetic Properties ◽  
Structural Research ◽  
Scanning Electron

This paper presents the results of an investigation into rapidly quenched Fe-based alloys with the chemical formula: Fe61Co10B20W1Y8−xPtx (where x = 3, 4, 5). In these alloys, a small quantity of Pt was added, and the Y content was reduced concurrently. Samples of the aforementioned alloys were injection-cast in the form of plates with the dimensions: 0.5 mm × 10 mm × 10 mm. The resulting structure was examined using X-ray diffractometry (XRD), Mössbauer spectroscopy and scanning electron microscopy (SEM). The results of the structural research reveal that, with a small addition of Pt, areas rich in Pt and Y are created—in which Fe-Pt and Pt-Y compounds, with different crystallographic systems, are formed. It has also been shown that an increase in Pt content, at the expense of Y, contributed to the formation of fewer crystalline phases, i.e., it allowed a material with a more homogeneous structure to be obtained. Magnetic properties of the Fe61Co10B20W1Y8−xPtx (where x = 3, 4, 5) alloy samples were tested using a vibrating sample magnetometer (VSM). The magnetic properties of the investigated materials revealed that the saturation magnetisation increased with increasing Pt content, at the expense of Y. This effect is due to the occurrence of different proportions of crystalline magnetic phases within the volume of each alloy.

The Effects of Ternary Elemental Additions on the Structure and Magnetic Properties of Nanocrystalline Feco Powders

2002 ◽  
Vol 753 ◽  
Author(s):  
I. Baker ◽  
R. G. Quiller ◽  
M. Robson ◽  
D. Wu
Keyword(s):  
Magnetic Properties ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Grain Sizes ◽  
Before And After ◽  
Diffraction Peaks ◽  
Computer Controlled ◽  
Steel Balls ◽  
Scanning Electron

ABSTRACTPowders of near-equiatomic Fe and Co were mechanically milled with additions of Zr, C, Ni, Cu and/or B for 60 hr using stainless steel balls in a Svegari attritor operated at 1300 r.p.m. under argon. The milled powders were examined before and after annealing at 600 °C. The morphologies and sizes of the powders were examined using a scanning electron microscope. The grain sizes were characterized from the widths of X-ray diffraction peaks obtained using a computer-controlled x-ray diffractometer and the lattice parameters were determined. The resulting magnetic properties were measured using a vibrating sample magnetometer.

Structural, dielectric and magnetic properties of Pr-, Tb- and Dy-doped (Bi0.95RE0.05)(Fe0.95Mn0.05)O3 ceramics synthesized by solid-state reaction method

2013 ◽  
Vol 03 (04) ◽  
pp. 1350033 ◽  
Author(s):  
Radheshyam Rai ◽  
Shweta Thakur ◽  
M. A. Valente ◽  
Andrei L. Kholkin
Keyword(s):  
Magnetic Properties ◽  
Solid State ◽  
Solid State Reaction ◽  
Magnetic Measurements ◽  
Ferroelectric Properties ◽  
Solid State Reaction Method ◽  
X Ray Diffraction ◽  
Solid State Reaction Technique ◽  
X Ray ◽  
Ceramic Samples

The multiferroic ( Bi 0.95 RE 0.05)( Fe 0.95 Mn 0.05) O 3 (where RE = Pr , Tb and Dy ) has been synthesized using solid-state reaction technique. Effects of Pr , Tb and Dy substitution on the structure, electrical and ferroelectric properties of ( Bi 0.95 RE 0.05)( Fe 0.95 Mn 0.05) O 3 samples have been studied by performing X-ray diffraction, dielectric measurements and magnetic measurements. The crystal structure of the ceramic samples have a monoclinic phase. The vibrating sample magnetometer (VSM) measurement shows a significant change in the magnetic properties of Pr -, Tb - and Dy -doped ( Bi 0.95 RE 0.05)( Fe 0.95 Mn 0.05) O 3. It is seen that coercive field (Hc) and remanent magnetization (Mr) increases for Pr but decreases for Dy and Tb .

MAGNETIC PROPERTIES OF Co-FERRITE AND SiO2-DOPED Co-FERRITE THIN FILMS AND POWDERS BY SOL–GEL

2004 ◽  
Vol 03 (04n05) ◽  
pp. 463-470
Author(s):  
Y. C. WANG ◽  
J. DING ◽  
B. H. LIU ◽  
Y. SHI
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Sol Gel ◽  
Vibrating Sample Magnetometer ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Structural And Magnetic Properties ◽  
Ferrite Thin Films ◽  
Scanning Electron

Thin films and powders of Co -ferrite and SiO 2-doped Co -ferrite were fabricated via the sol–gel method. The structural and magnetic properties of the films and powders were investigated with X-Ray Diffractometer (XRD), Vibrating Sample Magnetometer (VSM), Atomic Force Microscopy (AFM) and Scanning Electron Microscopy (SEM). VSM measurements showed an enhancement of coercivity by SiO 2-doping for Co -ferrite powders and thin films (coercivity of 3.5 kOe in SiO 2-doped thin films). XRD and SEM investigations revealed a nanostructure of the thin films. Low surface roughness was observed in our AFM study.

STRUCTURE AND MAGNETIC PROPERTIES OF CARBON-ENCAPSULATED Fe NANOPARTICLES OBTAINED BY A MODIFIED ARC PLASMA METHOD

2009 ◽  
Vol 23 (17) ◽  
pp. 2149-2153 ◽  
Author(s):  
GUIZHEN WANG ◽  
GENGPING WAN ◽  
CHUNCHENG HAO
Keyword(s):  
Magnetic Properties ◽  
Magnetic Measurements ◽  
Carbon Sources ◽  
Vibrating Sample Magnetometer ◽  
Arc Plasma ◽  
X Ray ◽  
Plasma Method ◽  
Transmission Electron ◽  
Fe Nanoparticles ◽  
Coating Layers

Carbon-encapsulated Fe nanoparticles were synthesized by a modified arc plasma method using methane and starch as carbon sources, respectively. The particles were characterized in detail by transmission electron microscope and X-ray powder diffraction. They are somewhat spherical in shape and the coating layers of the two sample types are composed of amorphous carbon. Magnetic measurements using a vibrating sample magnetometer demonstrate that the prepared composites have different magnetic properties.

scholarly journals Polystyrene/magnetite nanocomposite synthesis and characterization: investigation of magnetic and electrical properties for using as microelectromechanical systems (MEMS)

2017 ◽  
Vol 35 (1) ◽  
pp. 105-110 ◽  
Author(s):  
Mohammad Hassan Omidi ◽  
Mahboobeh Alibeygi ◽  
Farideh Piri ◽  
Mohammad Masoudifarid
Keyword(s):  
Electrical Conductivity ◽  
Cyclic Voltammetry ◽  
Magnetic Properties ◽  
Electrical Properties ◽  
Microelectromechanical Systems ◽  
Synthesis And Characterization ◽  
Vibrating Sample Magnetometer ◽  
Ft Ir ◽  
Scanning Electron

AbstractIn this work, a novel polystyrene/Fe3O4 nanocomposite prepared by in-situ method is presented. Magnetic Fe3O4 nanoparticles were encapsulated by polystyrene. The FT-IR spectra confirmed polystyrene/Fe3O4 nanocomposite preparation. The electrical properties of prepared nanocomposite were investigated by cyclic voltammetry (CV). The CV analysis showed good electrical conductivity of the synthesized nanocomposite. Magnetic properties of the nanocomposite were studied by vibrating sample magnetometer (VSM). The VSM analysis confirmed magnetic properties of the nanocomposite. The morphology and the size of the synthesized nanocomposite were investigated by field emission scanning electron microscope (FESEM). According to the VSM and CV results, such nanocomposite can be used in microelectromechanical systems.

scholarly journals Magnetic properties of a new cobalt hydrogen vanadate with a dumortierite-like structure: Co13.5(OH)6(H0.5VO3.5)2(VO4)6

2019 ◽  
Vol 75 (6) ◽  
pp. 777-782
Author(s):  
Mohammed Hadouchi ◽  
Abderrazzak Assani ◽  
Mohamed Saadi ◽  
Abdelilah Lahmar ◽  
Mimoun El Marssi ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Single Crystal ◽  
Magnetic Measurements ◽  
Crystal Form ◽  
X Ray Diffraction ◽  
One Dimensional ◽  
X Ray ◽  
Pyramidal Groups ◽  
Scanning Electron

The magnetic properties of a novel cobalt-based hydrogen vanadate, Co13.5(OH)6(H0.5VO3.5)2(VO4)6, are reported. This new magnetic material was synthesized in single-crystal form using a conventional hydrothermal method. Its crystal structure was determined from single-crystal X-ray diffraction data and was also characterized by scanning electron microscopy. Its crystal framework has a dumortierite-like structure consisting of large hexagonal and trigonal channels; the large hexagonal channels contain one-dimensional chains of face-sharing CoO6 octahedra linked to the framework by rings of VO4 tetrahedra, while the trigonal channels are occupied by chains of disordered V2O4 pyramidal groups. The magnetic properties of this material were investigated by DC magnetic measurements, which indicate the occurrence of antiferromagnetic interactions.

Investigation of Magnetic Properties of PS LATEX/MNPs Composite Films

2018 ◽  
Vol 915 ◽  
pp. 157-162
Author(s):  
Nazlı Ceren Dağyar ◽  
Şaziye Uğur
Keyword(s):  
Electron Microscopy ◽  
Magnetic Properties ◽  
Room Temperature ◽  
Morphological Changes ◽  
Composite Films ◽  
Superparamagnetic Nanoparticles ◽  
Vibrating Sample Magnetometer ◽  
Glass Substrates ◽  
Nanocomposite System ◽  
Scanning Electron

In the work reported here the magnetic properties of nanocomposite system composed of polystyrene (PS) latex polymer and superparamagnetic nanoparticles (MNPs), is presented. A series of mixtures were prepared by mixing of PS latex dispersion with different amount of MNPs and drop casting on glass substrates at room temperature. After drying, film samples were annealed at 250 °C for 10 min. Morphological changes of the films were examined by scanning electron microscopy (SEM) and magnetic properties studied using vibrating sample magnetometer (VSM) as a function of MNPs content. The saturation magnetization (Ms) of composites increased as MNPs content increased. Ms showed two maxima at 50 wt% and 85 wt% MNPs contents with Ms values of 0.014 emu and 0.020 emu, respectively. The morphological changes of PS/MNPs composite films were also found consistent with these results indicating that magnetic properties these composites can be readily tuned by varying MNPs content.

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