Structural and Magnetic Properties of Pure and Mn-Doped Bismuth Ferrite Powders

MRS Advances ◽  
2017 ◽  
Vol 2 (4) ◽  
pp. 253-258
Author(s):  
Hector A. Chinchay Espino ◽  
Gina M. Montes-Albino ◽  
Christian O. Villa Santos ◽  
Oscar J. Perales Perez
Keyword(s):  
Magnetic Properties ◽  
Electromagnetic Coupling ◽  
Bismuth Ferrite ◽  
X Ray Diffraction ◽  
Maximum Value ◽  
Maximum Magnetization ◽  
Mn Species ◽  
Size And Morphology ◽  
Mn Doped ◽  
Sem Analyses

ABSTRACTMultiferroic materials are of great interest from the scientific and technological viewpoints based on their multifunctional behavior involving ferroelectricity, ferromagnetism, ferroelasticity and strong electromagnetic coupling properties. Among these materials, BiFeO3 (BFO), is a well-known multiferroic with simultaneous ferroelectricity (TC=1103K) and G-type antiferromagnetism (TN=643K). In this work, we doped BiFeO3 with Mn species and studied the doping effect on the corresponding magnetic properties, expected from the substitution of Bi3+ by Mn2+. Additionally, the optimum processing conditions to minimize the formation of any impurity phase were also identified. X-Ray Diffraction (XRD) characterization confirmed the formation of powdered impurity-free BFO in pure and 7 at.% Mn-BFO only after annealing of the precursor compounds at suitable temperatures and time (700°C, 15 minutes). Scanning Electron Microscopy (SEM) analyses were used to determine the size and morphology of synthetized powders. Vibrating sample magnetometry (VSM) measurements showed that maximum magnetization values increased with doping and reached a maximum value in the 7 at.% Mn-doped BFO annealed at 700°C for 15min; the corresponding magnetization in the non-saturated MH loops reached 0.68 emu/g. This behavior can be attributed to the actual incorporation of Mn species into the BFO lattice and the substitution of non-magnetic Bi species.

Enhanced dielectric and magnetic properties in Mn-doped bismuth ferrite multiferroic nanoceramics

2020 ◽  
Vol 126 (7) ◽  
Author(s):  
B. Dhanalakshmi ◽  
B. Chandra Sekhar ◽  
K. V. Vivekananda ◽  
B. Srinivasa Rao ◽  
B. Parvatheeswara Rao ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Bismuth Ferrite ◽  
Mn Doped

SYNTHESIS AND STRUCTURE OF PURE AND Mn-DOPED ZINC OXIDE NANOPOWDERS

2010 ◽  
Vol 09 (01n02) ◽  
pp. 19-28 ◽  
Author(s):  
M. EBRAHIMIZADEH ABRISHAMI ◽  
S. M. HOSSEINI ◽  
E. ATTARAN KAKHKI ◽  
A. KOMPANY ◽  
M. GHASEMIFARD
Keyword(s):  
Optical Constants ◽  
Magnetic Impurity ◽  
Sol Gel ◽  
Optical Characterization ◽  
Secondary Phases ◽  
X Ray Diffraction ◽  
X Ray ◽  
Gel Technique ◽  
Size And Morphology ◽  
Mn Doped

Zn 1-x Mn x O (x = 0, 0.02, 0.06, 0.10, 0.15) nanopowders were synthesized by the sol–gel technique calcinated at low temperatures. By decreasing the grain size in ZnO , the solubility of magnetic impurity has been increased and no detectable secondary phases were observed even in the high Mn -doping samples. The phase formation, size and morphology of nanoparticles were investigated using X-ray diffraction and SEM observations. The samples were ferromagnetic and the Curie point was found in the range 150–170 K for Zn0.94Mn0.06O and 135–150 K for Zn0.98Mn0.02O . Optical characterization and the effect of doping were carried out by means of Fourier transform infrared (FTIR) spectroscopy. Kramers–Kronig analysis was employed to evaluate the optical constants of pure ZnO and ZnO:Mn nanopowders.

scholarly journals Structural and magnetic properties of the Bi1-xLuxFeO3 (x = 0.00, 0.02 and 0.04) system

DYNA ◽  
2020 ◽  
Vol 87 (215) ◽  
pp. 84-89
Author(s):  
Maria Morales Rivera ◽  
Ivan Betancourt ◽  
Segundo Martínez ◽  
Oscar Pardo ◽  
Julieth Mejia ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Bismuth Ferrite ◽  
Synthesis Temperature ◽  
Rhombohedral Structure ◽  
X Ray Diffraction ◽  
Crystalline Materials ◽  
X Ray ◽  
Magnetic Analysis ◽  
Structural And Magnetic Properties

This paper reports the synthesis and characterization of Bi1-xLuxFeO3 (x = 0.00, 0.02 and 0.04) produced by solid-state reaction, in order to evaluate the influence of lutetium on the structural and magnetic properties of bismuth ferrite (BiFeO3). The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX) and magnetic analysis by vibrating sample magnetometer (VSM) in temperature range from 50 to 320 K. The obtained results allowed to confirm the formation of crystalline materials of rhombohedral structure, space-group R3c (161), with defined morphology and particle sizes between 2.25 and 4.5 μm. The Lu3+ insertion in structure generated an increasing in magnetization, purity of BiFeO3 and a decrease in the synthesis temperature compared with the reported in the literature.

scholarly journals Structural transition and magnetic properties of high Cr-doped BiFeO3 ceramic

Cerâmica ◽  
2020 ◽  
Vol 66 (378) ◽  
pp. 114-118
Author(s):  
S. S. Arafat
Keyword(s):  
Magnetic Properties ◽  
Magnetic Hysteresis ◽  
Hysteresis Loops ◽  
Magnetic Phase Diagram ◽  
Magnetic Sensors ◽  
Spin Reorientation ◽  
X Ray Diffraction ◽  
Maximum Magnetization ◽  
Ion Doping ◽  
Crystal Structure Transformation

Abstract Magnetic properties of BiFe1-xCrxO3 perovskite-type solids reaction synthesized at high pressure were investigated and a magnetic phase diagram was established. X-ray diffraction data revealed a crystal structure transformation from rhombohedral to monoclinic as Cr3+ ions substituted Fe ions in the samples. Néel temperature TN and spin-reorientation temperature TSR were determined from dM/dT by measuring the temperature dependence of magnetization (M-T). The magnetization results indicated that TN and TSR were strongly dependent on Cr3+ ion doping; both TN and TSR decreased with the increase of Cr3+ doping. The magnetic hysteresis loops investigated at room temperature reflected an antiferromagnetic behavior from x= 0.4 to 0.6 and weak ferromagnetic at x=1.0. Besides, the remnant magnetization Mr and maximum magnetization Mmax increased with increasing x from 0.4 up to 1.0. The Cr doping was found to be helpful in reducing coercivity Hc for the magnetic samples from x= 0.4 to 0.8 and their applications as magnetic sensors are possible.

scholarly journals Engineering of magnetic properties in doped bismuth ferrite materials

2018 ◽  
Vol 218 ◽  
pp. 04027
Author(s):  
Hamdan Akbar Notonegoro ◽  
Bambang Soegijono ◽  
Isom Mudzakir
Keyword(s):  
Magnetic Properties ◽  
Room Temperature ◽  
Bismuth Ferrite ◽  
Magnetic Behaviour ◽  
Magnetic Saturation ◽  
Second Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Crystallite Structure

The engineering of magnetic behaviour of Li/Zn doped BiFeO3 had been done by synthesized a polycrystalline of BiFeO3, Bi0.96Li0.02FeO3, and Bi0.95Zn0.05FeO3. Investigation of crystallite structure and magnetic properties of the sampel had been done by X-ray diffraction and VSM analysis. At room temperature, the lithium and zinc doped bismuth ferrite has conducted a different magnetic behaviour. Within the ferromagnetic region, an increases of magnetic saturation or enlarger magnetic coercivity were identified. Doping lithium resulted in increasing magnetic saturation (Ms) and magnetic remanent (Mr), significantly. Meanwhile, doping zinc resulted in enlarger of magnetic coercivity coincide with the reveal of Bi20FeO40 as the second phase.

scholarly journals Lanthanum and Manganese Co-Doping Effects on Structural, Morphological, and Magnetic Properties of Sol-Gel Derived BiFeO3

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4844
Author(s):  
Dovydas Karoblis ◽  
Ramunas Diliautas ◽  
Kestutis Mazeika ◽  
Dalis Baltrunas ◽  
Gediminas Niaura ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Bismuth Ferrite ◽  
Sol Gel ◽  
Substitution Effects ◽  
Synthetic Approach ◽  
X Ray Diffraction ◽  
X Ray ◽  
Co Doping ◽  
Mössbauer Measurements ◽  
Doping Effects

In this work, lanthanum and manganese co-substitution effects on different properties of bismuth ferrite solid solutions Bi1-xLaxFe0.85Mn0.15O3 (x from 0 to 1) prepared by a sol-gel synthetic approach have been investigated. It was observed that the structural, morphological, and magnetic properties of obtained specimens are influenced by the amount of introduced La3+ ions. Surprisingly, only the compound with a composition of BiFe0.85Mn0.15O3 was not monophasic, and the presence of neighboring phases was determined from X-ray diffraction analysis and Mössbauer measurements. Structural transitions from orthorhombic to cubic and back to orthorhombic were also observed depending on the La3+ amount. Antiferromagnetic behaviour was observed for all of the samples, with the highest magnetisation values for Bi0.5La0.5Fe0.85Mn0.15O3. Additionally, structural attributes and morphological features were evaluated by Raman spectroscopy and scanning electron microscopy (SEM), respectively.

scholarly journals Improvement of the Magnetic Properties of Nanocrystalline Nd12.3(FeZrNbCu)81.7B6.0Alloys with Dy Substitutions

2015 ◽  
Vol 2015 ◽  
pp. 1-7
Author(s):  
Weiwei Yang ◽  
Leichen Guo ◽  
Zhimeng Guo ◽  
Guangle Dong ◽  
Yanli Sui ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Exchange Coupling ◽  
Single Phase ◽  
X Ray Diffraction ◽  
Material Microstructure ◽  
X Ray ◽  
Maximum Value ◽  
Transmission Electron ◽  
Melt Spun ◽  
Melt Spun Ribbons

Nd12.3−xDyxFe81.7Zr0.8Nb0.8Cu0.4B6.0  (x=0–2.5)ribbons have been prepared by melt-spun at 30 m/s and subsequent annealing. The influence of addition of Dy on the crystallization behavior, magnetic properties, and microstructure were investigated. Differential scanning calorimeter (DSC) and X-ray diffraction (XRD) revealed a single-phase material. Microstructure studies using transmission electron microscopy (TEM) had shown a significant microstructure refinement with Dy addition. Wohlfarth’s analysis showed that the exchange coupling interactions increased first with Dy contentxincreasing, reached the maximum value atx=0.5, and then slightly decreased withxfurther increasing. Optimal magnetic properties withJr=1.09 T,Hci=1048 kA/m, andBHmax=169.5 kJ/m3are achieved by annealing the melt-spun ribbons withx=0.5at% at 700°C for 10 min.

Effect of Substrate Variation on Electrical and Magnetic Properties of Mn Doped ZnO of Dilute Magnetic Semiconductors

2005 ◽  
Vol 891 ◽  
Author(s):  
Srikanth Manchiraju ◽  
Govind Mundada ◽  
Ted Kehl ◽  
Craig Vera ◽  
Rishi Patel ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Single Crystal ◽  
Magnetic Semiconductors ◽  
Dilute Magnetic Semiconductors ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electrical And Magnetic Properties ◽  
Quartz Substrates ◽  
Mn Doped

ABSTRACTIn this paper, the effect of substrate on the domain structure growth and electrical and magnetic properties of epitaxial Mn-doped Zn0.8Mn0.15O (ZnMnO) thin films has been investigated. Epitaxial thin films of ZnMnO dilute magnetic semiconductors (DMS) were grown on various substrates such as single crystal sapphire, single crystal silicon, and quartz substrates using Pulsed Laser Deposition (PLD) technique . Structural, surface, magnetic, and optical properties have been observed on these films using X-Ray diffraction (XRD), Atomic Force Microscopy (AFM), Scanning Electron Microscopy (SEM), and Raman spectroscopy. X-Ray Diffraction shows that films are highly epitaxial and c-axis oriented with some induced strain. AFM images show that film surface is smooth with RMS roughness of the order of 1-2 nm over 5*5sq.micron. Magnetic characteristic properties such as carrier concentration, mobility, and temperature dependent resistivity were also investigated. Carrier concentration decreases and mobility increases for both the films on silicon and quartz substrates when compared to film on sapphire.

Comparative Study of Pure and Ni-Doped ZnFe2O4 Nanoparticles for Structural, Optical and Magnetic Properties

2013 ◽  
Vol 699 ◽  
pp. 524-529 ◽  
Author(s):  
A. Manikandan ◽  
J. Judith Vijaya ◽  
L. John Kennedy
Keyword(s):  
Magnetic Properties ◽  
Combustion Method ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
Energy Band Gap ◽  
X Ray ◽  
Microwave Combustion ◽  
Ni Content ◽  
Maximum Value ◽  
Microwave Combustion Method

Pure and Ni-doped ZnFe2O4 nanoparticles, Zn1-xNixFe2O4 (x = 0.0, 0.1, 0.2, 0.3, 0.4 and 0.5) were synthesized by microwave combustion method (MCM). The structural, morphological and magnetic properties of the products were determined by X-ray diffraction (XRD), high resolution scanning electron microscopy (HR-SEM) and vibrating sample magnetometer (VSM). X-ray analysis showed that all the compositions crystallize with cubic spinel structure. The broadband visible emission is observed in the entire photoluminescence (PL) spectrum and the estimated energy band gap is about 2.1 eV. VSM measurements shows superparamagnetic behavior for lower concentration of Ni (x ≤ 0.2), whereas for higher concentration (x ≥ 0.2), it becomes ferromagnetic. The saturation magnetization (Ms) varies considerably with Ni content to reach a maximum value for Ni0.5Zn0.5Fe2O4 composition, i.e. 57.89 emu/g.

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