Structural and optical studies of Mg doped nanoparticles of chromium oxide (Cr2O3) synthesized by co-precipitation method

2018 ◽  
Author(s):  
Jarnail Singh ◽  
Vikram Verma ◽  
Ravi Kumar
Keyword(s):  
Chromium Oxide ◽  
Precipitation Method ◽  
Optical Studies ◽  
Co Precipitation ◽  
Mg Doped

Structural and optical studies of Pd doped tin oxide nanoparticles prepared by chemical co-precipitation method

2012 ◽  
Author(s):  
Brajesh Nandan ◽  
B. Venu Gopal ◽  
S. Amirthapandian ◽  
Sumita Santra ◽  
B. K. Panigrahi ◽  
...  
Keyword(s):  
Tin Oxide ◽  
Precipitation Method ◽  
Oxide Nanoparticles ◽  
Optical Studies ◽  
Tin Oxide Nanoparticles ◽  
Co Precipitation

scholarly journals Preparation and photocatalytic activity of multi-walled carbon nanotubes/Mg-doped ZnO nanohybrids

2015 ◽  
Vol 33 (3) ◽  
pp. 460-469 ◽  
Author(s):  
C. S. Chen ◽  
X. D. Xie ◽  
S. Y. Cao ◽  
T. G. Liu ◽  
L. W. Lin ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Precipitation Method ◽  
Multi Walled Carbon Nanotubes ◽  
Doped Zno ◽  
Co Precipitation ◽  
Walled Carbon Nanotubes ◽  
Degradation Of Methyl Orange ◽  
Mg Doped

Abstract Multi-walled carbon nanotubes/Mg-doped ZnO (MWNTs/Zn1-xMgxO) nanohybrids were prepared by co-precipitation method, and their photocatalytic activity for methyl orange (MO) was studied. Experimental results showed that Mg-doped ZnO nanoparticles were successfully deposited on the surface of MWNTs under annealing at 450 °C and 550 °C. The resultant MWNTs/Zn0.9Mg0.1O nanohybrids had better photocatalytic activity for degradation of methyl orange than pure ZnO: the rates of MO photodegradation were 100 % and 30 % for 1 h, respectively. The enhancement in the photocatalytic activity was attributed to the excellent electronic properties of MWNTs and Mg-doping.

Preparation and Electrochemical Performance of Mg-Doped LiNi0.4Co0.2Mn0.4O2 Cathode Materials by Urea Co-Precipitation

2012 ◽  
Vol 519 ◽  
pp. 152-155 ◽  
Author(s):  
Qian Zhang ◽  
Yan Sheng Zheng ◽  
Sheng Kui Zhong
Keyword(s):  
Electrochemical Performance ◽  
Layered Structure ◽  
Cathode Materials ◽  
Precipitation Method ◽  
Electrochemical Performances ◽  
Sem Images ◽  
Transfer Resistance ◽  
Co Precipitation ◽  
Charge Discharge ◽  
Mg Doped

The Mg-doped LiNi0.4Co0.2-xMn0.4MgxO2 cathode materials (x=0, 0.01, 0.02 and 0.03) were synthesized by a urea co-precipitation method. Its structure and electrochemical properties were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and electrochemical performance tests. XRD studies indicate that the Mg-doped LiNi0.4Co0.2Mn0.4O2 samples perform the same layered structure as the undoped LiNi0.4Co0.2Mn0.4O2. SEM images show that the particle size of Mg-doped LiNi0.4Co0.2Mn0.4O2 is smaller than the undoped LiNi0.4Co0.2Mn0.4O2 sample. Charge-discharge tests confirm that the rate capacity and cycling performance of LiNi0.4Co0.2-xMn0.4MgxO2 are improved by Mg-doped. The optimal doping content of Mg is x=0.02 in the LiNi0.4Co0.2-xMn0.4MgxO2 samples, which can achieve high initial charge-discharge capacity and good cyclic stability. The electrode reaction reversibility was enhanced, and the charge transfer resistance was decreased through the Mg-doping. The improved electrochemical performances of the Mg-doped LiNi0.4Co0.2Mn0.4O2 cathode materials are attributed to the addition of Mg2+ ion by stabilizing the layered structure.

scholarly journals Synthesis and Characterization of Undoped and Magnesium Doped Zinc Oxide Nanoparticles

2021 ◽  
pp. 134-139
Author(s):  
Roxy M S ◽  
Ananthu A ◽  
Sumithranand V B
Keyword(s):  
Zno Nanoparticles ◽  
Band Gap Energy ◽  
Sem Analysis ◽  
Precipitation Method ◽  
Structure Morphology ◽  
Uv Visible ◽  
Doped Zno ◽  
Xrd Patterns ◽  
Co Precipitation ◽  
Mg Doped

Undoped and Mg-doped ZnO nanoparticles were synthesized by co-precipitation method. The synthesized nanoparticles are successfully characterized by XRD, SEM, and UV-visible analysis. The Structure, Morphology, and Optical activity of the synthesized nanoparticle were studied with respect to ZnxMg1-xO (where x= 0, 2.5%M and 7.5%M). The XRD patterns revealed the wurtzite structure for all the nano samples. XRD studies confirmed that the crystalline size increased with increase in Mg content. The surface morphology of the prepared pure and Mg doped ZnO nanoparticles are investigated by SEM analysis. Optical characterization reveals that band gap energy decreases from 3.24 to 3.13 eV with Mg doping. UV-Visible results revealed that absorption underwent a red shift with Mg into ZnO as compared to pure ZnO.

Magnetic and dielectric properties of BiFeO3 nanoparticles

2015 ◽  
Vol 7 (2) ◽  
pp. 1393-1403
Author(s):  
Dr R.P VIJAYALAKSHMI ◽  
N. Manjula ◽  
S. Ramu ◽  
Amaranatha Reddy
Keyword(s):  
Diffuse Reflectance Spectrum ◽  
Precipitation Method ◽  
Secondary Phases ◽  
X Ray Diffraction ◽  
Bifeo3 Nanoparticles ◽  
Transmission Electron ◽  
Multiferroic Bifeo3 ◽  
Pure Phase ◽  
Simple Chemical ◽  
Co Precipitation

Single crystalline nano-sized multiferroic BiFeO3 (BFO) powders were synthesized through simple chemical co-precipitation method using polyethylene glycol (PEG) as capping agent. We obtained pure phase BiFeO3 powder by controlling pHand calcination temperature. From X-ray diffraction studies the nanoparticles were unambiguously identified to have a rhombohedrally distorted perovskite structure belonging to the space group of R3c. No secondary phases were detected. It indicates single phase structure. EDX spectra indicated the appearance of three elements Bi, Fe, O in 1:1:3. From the UV-Vis diffuse reflectance spectrum, the absorption cut-off wavelength of the BFO sample is around 558nm corresponding to the energy band gap of 2.2 eV. The size (60-70 nm) and morphology of the nanoparticles have been analyzed using transmission electron microscopy (TEM).   Linear M−H behaviour and slight hysteresis at lower magnetic field is observed for BiFeO3 nanoparticles from Vibrating sample magnetometer studies. It indicates weak ferromagnetic behaviour at room temperature. From dielectric studies, the conductivity value is calculated from the relation s = L/RbA Sm-1 and it is around 7.2 x 10-9 S/m.

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