Synthesis of Y3Al5-xFexO12 Nanopowder by the Co-Precipitation Method: Influence of Precipitate Agent

2013 ◽  
Vol 341-342 ◽  
pp. 114-118
Author(s):  
Min Zeng ◽  
Yun Hong Wang
Keyword(s):  
Phase Formation ◽  
Formation Process ◽  
Raw Materials ◽  
Precipitation Method ◽  
Precipitation Technique ◽  
Pure Phase ◽  
Co Precipitation ◽  
Carbonate Precursor ◽  
Phase Formation Process

The Y3Al5-xFexO12 (0x5, YAIG) powders have been prepared by co-precipitation technique in which NH4HCO3 or (NH4)2CO3 is used as a precipitant and Y(NO3)3·6H2O, Al (NO3)3·9H2O and Fe (NO3)3·9H2O as raw materials. The composition of YAIG precursor, the phase formation process of YAIG and the properties of the powders were investigated by means of XRD, SEM, TEM and EDS. The results indicated that the precipitant effects the preparation of pure-phase YAIG powders. AC as precipitant could produce a hydroxide precursor, which transformed to a mixture. AHC as precipitant could produce a loosely agglomerated carbonate precursor. The resultant YAIG powders showed good dispersity and excellent sinterability.

The Effect of Precipitate Agent in Co-Precipitation Synthesis Y3Al5O12 and Y3Fe5O12 Powders

2013 ◽  
Vol 750-752 ◽  
pp. 479-483
Author(s):  
Min Zeng ◽  
Yun Hong Wang
Keyword(s):  
Phase Formation ◽  
Formation Process ◽  
Raw Materials ◽  
Precipitation Technique ◽  
Pure Phase ◽  
Precipitation Synthesis ◽  
Co Precipitation ◽  
Phase Formation Process

The YAG and YIG powders have been prepared by co-precipitation technique in which NH4HCO3 or (NH4)2CO3 is used as a precipitant and Y(NO3)3·6H2O, Al (NO3)3·9H2O and Fe (NO3)3·9H2O as raw materials. The composition, the phase formation process and the properties of the YAG and YIG powders were investigated by means of XRD, SEM, TEM and EDS. The results indicated that the precipitant effects the preparation of pure-phase powders. The resultant YAG and YIG powders showed good dispersity and excellent sinterability using AHC as precipitant.

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.

Synthesis of ZnWO4 by the polymerizable complex method: evidence of amorphous phase coexistence during the phase formation process

2021 ◽  
Author(s):  
Magda S.S. Gondim ◽  
Eliezer C. Silva ◽  
Ananias L. dos Santos ◽  
Marcelo de Assis ◽  
José M.R. Mercury ◽  
...  
Keyword(s):  
Amorphous Phase ◽  
Phase Formation ◽  
Formation Process ◽  
Phase Coexistence ◽  
Complex Method ◽  
Method Evidence ◽  
Phase Formation Process

Preparation and Electrochemical Performance of Mn3O4/GR Composites Electrode Material in Supercapacitors

2019 ◽  
Vol 807 ◽  
pp. 50-56
Author(s):  
Yun Long Zhou ◽  
Zhi Biao Hu ◽  
Li Mei Wu ◽  
Jiao Hao Wu
Keyword(s):  
Room Temperature ◽  
Raw Materials ◽  
Precipitation Method ◽  
Electrochemical Performances ◽  
Manganese Sulfate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Co Precipitation ◽  
A Current ◽  
Discharge Test

Using hydrated manganese sulfate and general type graphene (GR) as raw materials, Mn3O4/GR composite has been successfully prepared by the liquid phase chemical co-precipitation method at room temperature. X-ray diffraction (XRD) was used to investigate the phase structure of Mn3O4powder and Mn3O4/GR composite; The electrochemical performances of the samples were elucidated by cyclic voltammetry and galvanostatic charge-discharge test in 0.5 mol/L Na2SO4electrolyte. The results show that the Mn3O4/GR composite possesses graphene phase and good reversibility; the composite also displays a specific capacitance of 318.8 F/g at a current density of 1 A/g.

Bi-2212 Phase Formation Process in Multifilamentary Bi-2212/Ag Wires and Tapes

2005 ◽  
Vol 15 (2) ◽  
pp. 2538-2541 ◽  
Author(s):  
T. Koizumi ◽  
T. Hasegawa ◽  
J. Nishioka ◽  
Y. Hikichi ◽  
T. Nakatsu ◽  
...  
Keyword(s):  
Phase Formation ◽  
Formation Process ◽  
Phase Formation Process
Sign in / Sign up

Export Citation Format

Share Document