scholarly journals Structural and Magnetic Properties of Mn Doped BiFeO3 Nanomaterials

2016 ◽  
Vol 2016 ◽  
pp. 1-5 ◽  
Author(s):  
V. Srinivas ◽  
A. T. Raghavender ◽  
K. Vijaya Kumar
Keyword(s):  
Magnetic Properties ◽  
Doping Concentration ◽  
Structural Changes ◽  
Sol Gel ◽  
Rietveld Analysis ◽  
Ferromagnetic Behavior ◽  
Structural Formation ◽  
Mn Doping ◽  
Structural And Magnetic Properties ◽  
Mn Doped

Nanocrystalline Bi1-xMnxFeO3  (0≤x≤0.3) materials were synthesized using sol-gel technique. The structural and magnetic properties were investigated in detail. Rietveld analysis from XRD revealed the structural formation of BiFeO3. As the Mn doping concentration was increased, the structure of BiFeO3 changed from rhombohedral to tetragonal. All the M-H loops showed the ferromagnetic behavior in the prepared samples. Magnetization was observed to enhance as the Mn doping concentration was increased. The enhanced magnetization may be due to the collapse of the space modulated spin structure as observed from the structural changes.

scholarly journals Enhanced Magnetic Properties of BiFeO3 Thin Films by Doping: Analysis of Structure and Morphology

Nanomaterials ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 711 ◽  
Author(s):  
Yilin Zhang ◽  
Yuhan Wang ◽  
Ji Qi ◽  
Yu Tian ◽  
Mingjie Sun ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Sol Gel ◽  
Exchange Interactions ◽  
Ferromagnetic Behavior ◽  
Ferromagnetic Properties ◽  
Structure And Morphology ◽  
Related Diversification ◽  
Lattice Distortions ◽  
Mn Doped

The improvement of ferromagnetic properties is critical for the practical application of multiferroic materials, to be exact, BiFeO3 (BFO). Herein, we have investigated the evolution in the structure and morphology of Ho or/and Mn-doped thin films and the related diversification in ferromagnetic behavior. BFO, Bi0.95Ho0.05FeO3 (BHFO), BiFe0.95Mn0.05O3 (BFMO) and Bi0.95Ho0.05Fe0.95Mn0.05O3 (BHFMO) thin films are synthesized via the conventional sol-gel method. Density, size and phase structure are crucial to optimize the ferromagnetic properties. Specifically, under the applied magnetic field of 10 kOe, BHFO and BFMO thin films can produce obvious magnetic properties during magnetization and, additionally, doping with Ho and Mn (BHFMO) can achieve better magnetic properties. This enhancement is attributed to the lattice distortions caused by the ionic sizes difference between the doping agent and the host, the generation of the new exchange interactions and the inhibition of the antiferromagnetic spiral modulated spin structure. This study provides key insights of understanding the tunable ferromagnetic properties of co-doped BFO.

Preparation of Visible-Light Active Mn-Doped TiO2 Photocatalyst and its Photodegradation of Methylene Blue from Solution

2014 ◽  
Vol 989-994 ◽  
pp. 531-535
Author(s):  
Yin Chen ◽  
Xiao Jun Ma
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Doping Concentration ◽  
Sol Gel ◽  
Mn Doping ◽  
Enhanced Absorption ◽  
Photodegradation Rate ◽  
Visible Light Active ◽  
Mn Doped

Mn-doped TiO2nanocrystal photocatalysts were prepared by the sol-gel method using MnSO4·H2O as manganese source. The catalysts were characterized by XRD, SEM, EPR, UV-Vis, their photocatalytic activity for methylene blue (MB) degradation was investigated. The results showed that Mn was doped into the crystal lattice of TiO2, and had no influence on TiO2crystal structure; the size of TiO2nanoparticle gradually decreased with Mn doping concentration increasing. The Mn-doped TiO2catalysts have enhanced absorption in the visible light region, and its visible light absorptivity increased with Mn doping concentration increasing. The UV-Vis showed the Mn-doped TiO2showed higher photocatalytic activity than the undoped TiO2for methylene blue degradation under visible light irradiation. It is also found that the MB photodegradation rate of Mn-doped TiO2improved by 46% than that of the undoped TiO2.

scholarly journals The Structural and Magnetic Properties of the Double Rearth Elements La1−xNdxFeO3 Nanoparticles

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Nguyen Thi Thuy ◽  
Bach Thanh Cong ◽  
Dang Le Minh
Keyword(s):  
Particle Size ◽  
Magnetic Properties ◽  
Magnetic Property ◽  
Room Temperature ◽  
Sol Gel ◽  
Ferromagnetic Behavior ◽  
Orthorhombic Structure ◽  
Nanosized Powders ◽  
Structural And Magnetic Properties ◽  
20 Nm

The double rearth elements La1−xNdxFeO3 (0≤x≤0.5) nanosized powders with orthorhombic structure were prepared by sol-gel method. The particle size of the La1−xNdxFeO3 powder is about 20 nm. The doping of the second rearth element in the A position of the compound ABO3 influenced the crystalline structure and magnetic property of the samples. The M(H) dependence shows that the nanosized La1−xNdxFeO3 samples exhibit ferromagnetic behavior in the room temperature and the M(H) curves are well fitted by Langevin functions.

scholarly journals Sol-gel Auto Combustion Synthesis, Structural and Magnetic Properties of Mn doped ZnO Nanoparticles

2018 ◽  
Vol 20 ◽  
pp. 174-180 ◽  
Author(s):  
Shankar D. Birajdar ◽  
R.C. Alange ◽  
S.D. More ◽  
V.D. Murumkar ◽  
K.M. Jadhav
Keyword(s):  
Magnetic Properties ◽  
Combustion Synthesis ◽  
Zno Nanoparticles ◽  
Sol Gel ◽  
Auto Combustion ◽  
Structural And Magnetic Properties ◽  
Doped Zno ◽  
Mn Doped

Structure and Magnetic Properties of (Al, Co) Co-Doped ZnO Thin Films

2012 ◽  
Vol 531-532 ◽  
pp. 299-302
Author(s):  
Ping Cao ◽  
Yue Bai
Keyword(s):  
Magnetic Properties ◽  
Sol Gel ◽  
Ferromagnetic Behavior ◽  
X Ray Diffraction ◽  
Al Doping ◽  
X Ray ◽  
Free Carriers ◽  
Structural And Magnetic Properties ◽  
Co Doped ◽  
Main Factor

In this study, Zn0.99Co0.01Al0.015O thin film has been prepared by sol-gel method. The structural and magnetic properties of the sample were investigated. X-ray diffraction spectroscopy analyses indicate that the Co and Al codoping can not disturb the structure of ZnO. No additional peaks are observed in the Zn0.99Co0.01AlxO and Al3+ and Co2+ substitute for Zn2+ without changing the wurtzite structure. The resistance measurements confirm that Al ions increase the free carriers concentration. Based on the above experiments we think the ferromagnetic behavior of the sample could not originate from Co nanoclusters. The presence of free carriers and localized d spins is a prerequisite for the appearance of ferromagnetism. As the result, the carriers generated by Al doping is considered a main factor to induce the ferromagnetic phenomenon.

Structural and Magnetic Properties of Cr- and Fe-Doped CeO2 Nanoparticles Prepared by Sol-Gel Method

2016 ◽  
Vol 848 ◽  
pp. 682-687 ◽  
Author(s):  
Sheng Hong Yang ◽  
Yue Li Zhang
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Magnetic Measurements ◽  
Physical Property Measurement System ◽  
Sol Gel ◽  
Physical Property ◽  
Ferromagnetic Behavior ◽  
Sem Images ◽  
Uniform Size ◽  
Structural And Magnetic Properties

A study of the structural and magnetic properties of Cr-and Fe-doped CeO2 nanoparticles produced by the sol–gel-based method was undertaken. The crystal structure and phase, morphology, and magnetic properties of the sample were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy (Raman) and physical property measurement system (PPMS). XRD and Raman studied showed that Cr-and Fe-doped did not change CeO2 original cubic fluorite crystal structure, and no ferromagnetic secondary phase was observed. SEM images showed that Cr-and Fe-doped CeO2 nanoparticles were spherical, uniform size, and good dispersion. The particle size was about 20 nm. The magnetic measurements showed that the Cr-and Fe-doped CeO2 nanoparticles presented ferromagnetic behavior at 10 and 300 K, indicating the Curie temperature was above room temperature. The magnetization diminished with the increase of the temperature. The saturation magnetization and coercivity of Fe-doped CeO2 nanoparticles were higher than that of Cr-doped CeO2 nanoparticles. Combined with the results of XRD and Raman, the ferromagnetic behavior can be attributed to the intrinsic properties of Cr-and Fe-doped CeO2 nanostructures.

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