Effect of Hydrothermal Reaction Time on Electrical, Structural and Magnetic Properties of Cobalt Ferrite

2020 ◽  
Vol 234 (2) ◽  
pp. 323-353 ◽  
Author(s):  
Farzana Majid ◽  
Amarah Nazir ◽  
Sadia Ata ◽  
Ismat Bibi ◽  
Hafiz Shahid Mehmood ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Reaction Time ◽  
Cobalt Ferrite ◽  
Hydrothermal Reaction ◽  
Spinel Ferrite ◽  
Uniaxial Anisotropy ◽  
Tangent Loss ◽  
Hydrothermal Route ◽  
X Ray ◽  
Hydrothermal Reaction Time

AbstractCobalt ferrite was synthesized by hydrothermal route in order to investigate the effect of hydrothermal reaction time on structural, magnetic and dielectric properties. The synthesized cobalt ferrite was characterized by X-ray diffraction, Fourier transform infrared and Vibrating-Sample Magnetometer (VMS). XRD data analysis confirmed the formation of cubic inverse spinel ferrite for complete time series as the high intensity peak corresponds to cubic normal spinel structure. The ionic radii, cation distribution among tetrahedral and octahedral sites, lattice parameters, X-ray density, bond lengths were also investigated cobalt ferrite prepared at different hydrothermal reaction time. The crystallite size was found to be in the range of 11.79–32.78 nm. Tolerance factor was near unity that also confirms the formation of cubic ferrites. VSM studies revealed the magnetic nature of cobalt ferrite. The coercivity (1076.3Oe) was observed for a sample treated for 11 h. The squareness ratio was 0.56 that is close to 0.5 which shows uniaxial anisotropy in cobalt ferrite. Frequency dependent dielectric properties i.e. dielectric constant, AC conductivity, tangent loss and AC resistivity are calculated with the help of Impedance Analyzer. Intrinsic cation vibration of cubic spinel ferrites are confirmed from FTIR analysis in the range of 400–4000 cm−1. In view of enhanced properties, this technique could possibly be used for the synthesis of cobalt ferrite for different applications.

Effect of hydrothermal dwell time on the diameter-controlled synthesis and magnetic property of MnO2 nanorods

2014 ◽  
Vol 28 (06) ◽  
pp. 1450045 ◽  
Author(s):  
Arbab Mohammad Toufiq ◽  
Fengping Wang ◽  
Qurat-ul-Ain Javed ◽  
Yan Li
Keyword(s):  
Electron Microscopy ◽  
Reaction Time ◽  
Dwell Time ◽  
Hydrothermal Reaction ◽  
Ferromagnetic Behavior ◽  
X Ray Diffraction ◽  
Hydrothermal Route ◽  
Transmission Electron ◽  
Facile Hydrothermal Route ◽  
Hydrothermal Reaction Time

In this paper, single crystalline 1D tetragonal MnO 2 pen-type nanorods were synthesized by varying the dwell time through a facile hydrothermal route at a reaction temperature of 250°C. X-ray diffraction (XRD) and transmission electron microscopy (TEM) studies showed that the diameter of MnO 2 nanorods decreases from 460 nm to 250 nm with the increase in hydrothermal reaction time from 5 h to 15 h. Field-emission scanning electron microscopy (FESEM) and TEM studies revealed the evolution of improved surface morphology of MnO 2 nanorods that are prepared with longer hydrothermal reaction time. The magnetic properties of the products were evaluated using vibrating sample magnetometer (VSM) at room temperature, which showed that the as-prepared samples exhibit weak ferromagnetic behavior. The effect of diameter on the magnetization values was observed and discussed in detail.

Influence of hydrothermal reaction time on the supercapacitor performance of Ni-MOF nanostructures

2021 ◽  
Vol 127 (6) ◽  
Author(s):  
M. R. Manikandan ◽  
K. P. Cai ◽  
Y. D. Hu ◽  
C. L. Li ◽  
J. T. Zhang ◽  
...  
Keyword(s):  
Reaction Time ◽  
Hydrothermal Reaction ◽  
Supercapacitor Performance ◽  
Hydrothermal Reaction Time

Facile Hydrothermal Synthesis of Molybdenum Disulfide (MoS2) as Advanced Electrodes for Super Capacitors Applications

MRS Advances ◽  
2016 ◽  
Vol 1 (45) ◽  
pp. 3089-3097 ◽  
Author(s):  
H. Adhikari ◽  
C. Ranaweera ◽  
R. Gupta ◽  
S. R. Mishra
Keyword(s):  
Reaction Time ◽  
Electrochemical Properties ◽  
Molybdenum Disulfide ◽  
Electrode Materials ◽  
Hydrothermal Reaction ◽  
Three Dimensional ◽  
Electrochemical Performances ◽  
X Ray Diffraction ◽  
Supercapacitor Applications ◽  
Hydrothermal Reaction Time

ABSTRACTA facile hydrothermal method was used to synthesize molybdenum disulfide (MoS2) microspheres. The effect of hydrothermal reaction time on morphology and electrochemical properties of MoS2 microspheres was evaluated. X-ray diffraction showed presence of crystalline MoS2 structure, where content of crystalline phase was observed to increase with hydrothermal reaction time. Electrochemical properties of MoS2 were evaluated using cyclic voltammetry (CV) and galvanostatic charge-discharge in 3M KOH solution. Specific capacitance of nanostructured MoS2 was observed to be between 68 F/g and 346 F/g at different scan rates along with excellent cyclic stability. High power density (∼1200 W/kg) and energy density (∼5 Wh/kg) was observed for MoS2 sample synthesized for 24 hours of hydrothermal reaction time. Overall optimal electrocapactive performance was observed for sample prepared for 24 hours of reaction time. It is demonstrated that the obtained MoS2 microspheres with three-dimensional architecture has excellent electrochemical performances as electrode materials for supercapacitor applications.

scholarly journals CuFe2O4@CuO: A Magnetic Composite Synthesized by Ultrasound Irradiation and Degradation of Methylene Blue on Its Surface in the Presence of Sunlight

Proceedings ◽  
2019 ◽  
Vol 48 (1) ◽  
pp. 17 ◽  
Author(s):  
Ahmad Massoud-Sharifi ◽  
Gheffar K. Kara ◽  
Mahboubeh Rabbani
Keyword(s):  
Methylene Blue ◽  
Environmental Remediation ◽  
Spinel Ferrite ◽  
Sol Gel ◽  
Chemical Properties ◽  
Pollutant Removal ◽  
Magnetic Composite ◽  
Hydrothermal Route ◽  
X Ray ◽  
Practical Applications

Spinel ferrite MFe2O4 (M = Cu, Ca, Mg, Ni, etc.) nanoparticles and their composites are a new promising materialbecause they have shown great interest in the field of sensing, optoelectronics, catalysis, and solar cells due to their unique physical and chemical properties that differ from their bulk structures. Today, lots of CuFe2O4 nanomaterials have been synthesized by different methods, such as hydrothermal route and sol-gel combustion methods. Nevertheless, there are hardly any results about photocatalytic activity. For this reason, we tried to increase optical properties by preparing a composite of CuFe2O4 nanomaterials with other oxides. In this paper, a CuFe2O4@CuO magnetic composite was synthesized via an ultrasound method. The samples prepared were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), diffuse reflectance spectrpscopy (DRS), field emission scanning electron microscopy (FESEM) images, vibrating sample magnetometer (VSM), and elemental analysis (energy-dispersive X-ray (EDX)). The catalytic activity of as-synthesized CuFe2O4@CuO was evaluated using the degradation of methylene blue. Furthermore, a possible reaction mechanism was discussed. Finally, the catalyst was used for effective degradation of methylene blue (MB) in its solution, which indicated a potential for practical applications in water pollutant removal and environmental remediation.

Synthesis, Characterization and Magnetic Properties of Cobalt Ferrite Nanoparticles Prepared by Glycine Assisted Sol-Gel Auto-Combustion Technique

2013 ◽  
Vol 209 ◽  
pp. 31-34 ◽  
Author(s):  
A.B. Shinde ◽  
G.H. Kale ◽  
V.N. Dhage ◽  
P.K. Gaikwad ◽  
K.M. Jadhav
Keyword(s):  
Electron Microscopy ◽  
Cobalt Ferrite ◽  
Spinel Ferrite ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Auto Combustion ◽  
Ray Density ◽  
Combustion Technique ◽  
Scanning Electron

Nano-particles of (38 nm size) cobalt ferrite (CoFe2O4) were synthesized by sol-gel auto-combustion technique using high purity metal nitrates and glycine as a fuel. The characterization studies were conducted by X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. The analysis of X-ray diffraction pattern suggests that, the prepared CoFe2O4 spinel ferrite possess single phase cubic spinel structure. The most intense peak (311) of the XRD pattern was used to determine the crystallite size. lattice constant and X-ray density were calculated by using XRD data. The values of lattice constant and X-ray density are found to in the reported range but slightly higher as compared to bulk CoFe2O4 sample. The surface morphology of the CoFe2O4samples was examined through scanning electron microscopy (SEM) technique. The result of SEM analysis shows that grain size is of the order of 62 nm. The CoFe2O4 nano-particle exhibit ferromagnetic behavior having saturation magnetization (Ms) and coercivity (Hc) values in the range of 83 emu/gm and 1381 Oe respectively. The high values of saturation magnetization and coercivity gives the evidence of nanocrystalline nature of the prepared CoFe2O4 spinel ferrite.

Hydrothermal synthesis and electrochromism of WO3 nanocuboids

RSC Advances ◽  
2014 ◽  
Vol 4 (39) ◽  
pp. 20145-20153 ◽  
Author(s):  
Sangeeta Adhikari ◽  
Debasish Sarkar
Keyword(s):  
Reaction Time ◽  
Hydrothermal Synthesis ◽  
Acid Concentration ◽  
Tungsten Trioxide ◽  
Hydrothermal Reaction ◽  
Processing Parameters ◽  
Important Processing ◽  
Hydrothermal Reaction Time

Tungsten trioxide (WO3) nanocuboids are preferentially developed through control over three important processing parameters: fluoroboric acid concentration, hydrothermal reaction time and temperature.

scholarly journals Hydrothermal Synthesis of Ni/Al Layered Double Hydroxide Nanorods

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Yun Zhao ◽  
Fenfei Xiao ◽  
Qingze Jiao
Keyword(s):  
Electron Microscopy ◽  
Reaction Time ◽  
Layered Double Hydroxide ◽  
Hydrothermal Reaction ◽  
Ph Value ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Double Hydroxide ◽  
Scanning Electron

Ni/Al layered double hydroxide (LDH) nanorods were successfully synthesized by the hydrothermal reaction. The crystal structure of the products was characterized by X-ray diffraction (XRD). The morphology of the products was observed using transmission electron microscopy (TEM) and field emission scanning electron microscopy (SEM). The influences of reaction time and pH value on the morphology of the Ni/Al LDHs were investigated. The result showed that the well-crystallized nanorods of Ni/Al LDHs could be obtained when the pH value was about 10.0 with a long reaction time (12–18 h) at 180°C.

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