Synthesis and characterization of magnetically separable La1−x Bi x Cr1−y Fe y O3 and photocatalytic activity evaluation under visible light

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Aamir Ghafoor ◽  
Ismat Bibi ◽  
Sadia Ata ◽  
Farzana Majid ◽  
Shagufta Kamal ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Visible Light ◽  
Orthorhombic Phase ◽  
Xrd Analysis ◽  
Dielectric Parameters ◽  
Dc Electrical Resistivity ◽  
Storage Devices ◽  
Energy Devices ◽  
Prepared Material ◽  
Magnetically Separable

Abstract A series of Bi and Fe doped La1−x Bi x Cr1−y Fe y O3 (x = 0.00–0.10 and y = 0.02–0.12) perovskites were fabricated through a facile microemulsion method and were characterized by XRD, DC electrical-resistivity, dielectric, VSM, and UV–Visible measurements. Orthorhombic phase of synthesized substituted chromite nanocrystallite was confirmed by powdered XRD analysis with crystallite size in 47.8–32.9 nm range. DC electrical resistivity was observed to increase from 1.70–39.99 × 108 Ω-cm. Dielectric parameters analyzed in frequency range of 20 kHz–20 MHz were decreased, while magnetic parameters were observed to increase with the increase in dopant (Bi+3 and Fe+3) concentration. Whereas coercivity values was low (narrow hysteresis loop), which indicate the soft ferromagnetic of the prepared material materials which are quite useful to employ in storage devices and electronics. Moreover, La1−x Bi x Cr1−y Fe y O3 degraded 90.80% Rhodamine B dye under visible light irradiation within 55 min. The increase in electrical resistivity, while decrease in dielectric parameters was also observed with increase in dopant concentration, ferromagnetic nature and excellent photocatalytic properties make this material suitable for high frequency energy devices, microwave appliances as well as an excellent magnetically separable photocatalyst for the purification of contaminated wastewater.

Electrical, Dielectrical and Magnetic Properties of Zr-Mn Doped Nano-Ferrites

2012 ◽  
Vol 510-511 ◽  
pp. 301-306
Author(s):  
K. Khan ◽  
Ashari Maqsood
Keyword(s):  
Activation Energy ◽  
Electrical Resistivity ◽  
Drift Mobility ◽  
Nominal Composition ◽  
Frequency Range ◽  
Energy Increase ◽  
Dielectric Parameters ◽  
Dc Electrical Resistivity ◽  
Low Field ◽  
Mn Doped

We measured the dc electrical resistivity as a function of temperature and dielectric parameters in the frequency range 100 Hz to 3 MHz of nanosized Zr-Mn spinel ferrites with nominal composition CoFe2-2xZrxMnxO4(0.1x0.4). The dc electrical resistivity decreased with the rise in temperature for all the samples, showing a semiconductor like behavior. From the dc electrical resistivity the activation energy and drift mobility are determined. Both the drift mobility and activation energy increase with a rise inx. The dielectric constant, dielectric (losses) and ac electrical resistivity as a function of frequency are also reported. The low field ac magnetic susceptibility measurement showed that the ferrimagentic transition temperature is in the range of 4395 K to 6585 K.

scholarly journals Correction: Facile preparation of novel quaternary g-C3N4/Fe3O4/AgI/Bi2S3 nanocomposites: magnetically separable visible-light-driven photocatalysts with significantly enhanced activity

RSC Advances ◽  
2021 ◽  
Vol 11 (36) ◽  
pp. 22148-22148
Author(s):  
Anise Akhundi ◽  
Aziz Habibi-Yangjeh
Keyword(s):  
Visible Light ◽  
Enhanced Activity ◽  
Visible Light Driven ◽  
Facile Preparation ◽  
Magnetically Separable

Correction for ‘Facile preparation of novel quaternary g-C3N4/Fe3O4/AgI/Bi2S3 nanocomposites: magnetically separable visible-light-driven photocatalysts with significantly enhanced activity’ by Anise Akhundi et al., RSC Adv., 2016, 6, 106572–106583. DOI: 10.1039/C6RA12414C.

Effect of Cu substitution on magnetic and DC electrical resistivity properties of Ni–Zn nanoferrites

2021 ◽  
Author(s):  
K. Chandramouli ◽  
P. Anantha Rao ◽  
B. Suryanarayana ◽  
Vemuri Raghavendra ◽  
Shaik Jesus Mercy ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Dc Electrical Resistivity ◽  
Cu Substitution

The Hexagonal ↔ Orthorhombic Structural Phase Transition in Claringbullite, Cu4FCl(OH)6

2021 ◽  
Author(s):  
Mark D. Welch ◽  
Jens Najorka ◽  
Michael S. Rumsey ◽  
John Spratt
Keyword(s):  
Phase Transition ◽  
Data Storage ◽  
Structural Phase Transition ◽  
Structural Changes ◽  
Structural Phase ◽  
Magnetic Behavior ◽  
Orthorhombic Phase ◽  
New Mineral ◽  
Storage Devices ◽  
Definition Of

ABSTRACT Frustrated magnetic phases have been a perennial interest to theoreticians wishing to understand the energetics and behavior of quasi-chaotic systems at the quantum level. This behavior also has potentially wide applications to developing quantum data-storage devices. Several minerals are examples of such phases. Since the definition of herbertsmithite, Cu3ZnCl2(OH)6, as a new mineral in 2004 and the rapid realization of the significance of its structure as a frustrated antiferromagnetic phase with a triangular magnetic lattice, there has been intense study of its magnetic properties and those of synthetic compositional variants. In the past five years it has been recognized that the layered copper hydroxyhalides barlowite, Cu4BrF(OH)6, and claringbullite, Cu4FCl(OH)6, are also the parent structures of a family of kagome phases, as they also have triangular magnetic lattices. This paper concerns the structural behavior of claringbullite that is a precursor to the novel frustrated antiferromagnetic states that occur below 30 K in these minerals. The reversible hexagonal (P63/mmc) ↔ orthorhombic (Pnma or Cmcm) structural phase transition in barlowite at 200−270 K has been known for several years, but the details of the structural changes that occur through the transition have been largely unexplored, with the focus instead being on quantifying the low-temperature magnetic behavior of the orthorhombic phase. This paper reports the details of the structural phase transition in natural claringbullite at 100−293 K as studied by single-crystal X-ray diffraction. The transition temperature has been determined to lie between 270 and 293 K. The progressive disordering of Cu at the unusual trigonal prismatic Cu(OH)6 site on heating is quantified through the phase transition for the first time, and a methodology for refining this disorder is presented. Key changes in the behavior of Cu(OH)4Cl2 octahedra in claringbullite have been identified that suggest why the Pnma structure is likely stabilized over an alternative Cmcm structure. It is proposed that the presence of a non-centrosymmetric octahedron in the Pnma structure allows more effective structural relaxation during the phase transition than can be achieved by the Cmcm structure, which has only centrosymmetric octahedra.

scholarly journals Improvement of superconducting parameters of Bi1.6Pb0.4Sr 2Ca 2Cu 3O10+ δ added with Au nanoparticles

2018 ◽  
Vol 16 (38) ◽  
Author(s):  
Amal K. Jassim
Keyword(s):  
Electrical Resistivity ◽  
Magnetic Susceptibility ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Au Nanoparticles ◽  
Ac Magnetic Susceptibility ◽  
Critical Temperatures ◽  
Magnetization Measurements ◽  
Dc Electrical Resistivity

Samples of Bi1.6Pb0.4Sr2Ca2Cu3O10+δ superconductor were prepared by solid-state reaction method to study the effects of gold nanoparticles addition to the superconducting system, Nano-Au was introduced by small weight percentages (0.25, 0.50, 0.75, 1.0, and 1.25 weight %). Phase identification and microstructuralcharacterization of the samples were investigated using XRD and SEM. Moreover, DC electrical resistivity as a function of the temperature, critical current density Jc, AC magnetic susceptibility, and DC magnetization measurements were carried to evaluate the relative performance of samples. x-ray diffraction analysis showed that both (Bi,Pb)-2223 and Bi-2212 phases coexist in the samples having an orthorhombic crystal structure. Both the onset critical temperatures Tc (onset) and zero electrical resistivity critical temperatures Tc (R=0) of the samples were determined from the DC electrical resistivity measurements. An improvement of the superconducting transition temperature of 6.36 % was obtained with increasing Au nanoparticles to x = 1.25 wt.%, while the critical current density is improved by 220 %. AC magnetic susceptibility measurement showed that the diamagnetic fraction and intergranular coupling of the x = 1.25 wt.% sample are greater than those of the others. The variation of magnetization with temperature (M-T curve) of the samples was measured by cooling the sample in zero fields (ZFC) and an applied field of 10 Oe (FC). The results of AC magnetic susceptibility and DC magnetization measurements were in good agreement with DC electrical resistivity measurement.

Magnetic properties and DC electrical resistivity studies on cadmium substituted nickel–zinc ferrite system

2011 ◽  
Vol 323 (16) ◽  
pp. 2115-2121 ◽  
Author(s):  
M. Siva Ram Prasad ◽  
B.B.V.S.V. Prasad ◽  
B. Rajesh ◽  
K.H. Rao ◽  
K.V. Ramesh
Keyword(s):  
Magnetic Properties ◽  
Electrical Resistivity ◽  
Zinc Ferrite ◽  
Dc Electrical Resistivity ◽  
Nickel Zinc ◽  
Ferrite System

Studies on structural, magnetic, and DC electrical resistivity properties of Co0.5M0.37Cu0.13Fe2O4 (M = Ni, Zn and Mg) ferrite nanoparticle systems

2018 ◽  
Vol 29 (11) ◽  
pp. 2601-2607 ◽  
Author(s):  
A. Ramakrishna ◽  
N. Murali ◽  
S.J. Margarette ◽  
Tulu Wegayehu Mammo ◽  
N. Krishna Joythi ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Dc Electrical Resistivity ◽  
Ferrite Nanoparticle
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