scholarly journals Effect of Tin Loading on Physical Properties and Phase Transformation of as-synthesized Zn-Sn-O Compound Powder Synthesized by Co-precipitation Method

2014 ◽  
Vol 56 ◽  
pp. 673-677
Author(s):  
C. Kahattha ◽  
K. Chongsri ◽  
R. Noonuruk ◽  
W. Mekprasart ◽  
W. Pecharapa
Keyword(s):  
Phase Transformation ◽  
Physical Properties ◽  
Precipitation Method ◽  
Compound Powder ◽  
Co Precipitation

Aluminate Green Phosphor with Small Particle Size Used for PDP via Co-Precipitation Method

2011 ◽  
Vol 295-297 ◽  
pp. 890-895
Author(s):  
Yan Dong ◽  
Yang Zhou ◽  
Xue Lin Han ◽  
Wei Jie Gu
Keyword(s):  
Particle Size ◽  
Phase Transformation ◽  
Small Particle ◽  
High Efficiency ◽  
Particle Growth ◽  
Solid State Reaction Method ◽  
Precipitation Method ◽  
Small Particle Size ◽  
Green Phosphor ◽  
Co Precipitation

Mg doped BaAl12O19:Mn2+ phosphor is one of the most efficient green phosphors for PDP. It is difficult to prepare the phosphor both have small particle size (< 3μm) and high luminescence. In the present work, a BaAl12O19:Mn2+ phosphor with small particle size was synthesized by the chemical co-precipitation method. Phase transformation and particle growth process during calcining process were investigated. The nucleation process was also discussed. The results show that, the phase transformation is complicated, the transition phases include BaCO3, γ-Al2O3, BaF2, BaAl2O4 and two phases contain Mn; The BaAl12O19 phase is formed from the reaction between BaAl2O4 phase and γ-Al2O3 phase, no a-Al2O3 phase appears during the entire process; The formation temperature of pure BaAl12O19 phase is 1200°C, which is lower than that in the high-temperature solid state reaction method. High efficiency BaAl12O19:Mn2+ phosphor with small particle size (< 2μm) and hexagonal flaky shape can be prepared by this method.

Effect of Calcination Temperature on Phase Transformation and Microstructure of Al2O3/GdAlO3 Compound Powder Prepared by Co-Precipitation Method

2012 ◽  
Vol 512-515 ◽  
pp. 535-538 ◽  
Author(s):  
Shuai Sun ◽  
Qiang Xu
Keyword(s):  
Calcination Temperature ◽  
Raw Materials ◽  
Metastable Phase ◽  
Precipitation Method ◽  
Calcination Process ◽  
Compound Powder ◽  
Average Grain Size ◽  
Different Temperatures ◽  
Diffraction Peaks ◽  
Co Precipitation

A Coprecipitation Method Was Applied to Synthesize Al2O3/GdAlO3 Compound Powder, Using Ammonia as the Precipitator. Gadolinium Oxide and Aluminium Nitrate Were Used as the Raw Materials with the Eutectic Ratio( 77 mol% Al 3+ – 23 mol% Gd 3+ ). the Precursor Was Calcined at Different Temperatures from 1200 to 1600 °C. the Phase Identifications at Different Temperatures Were Characterized by X-ray Diffractometry (XRD). the Growth Morphology of Particles Were Investigated Using Field Emission Electro Microscopy (FE-SEM). the Results Reveal that GdAlO3 Crystallized Earlier than α-Al2O3. the Diffraction Peaks of α-Al2O3 Phase Were Observed after Calcination at 1300°C for 1 H. Metastable Phase Gd3Al5O12 Underwent Complete Decomposition at 1600°C for 1 H. Gadolinium Aluminate and α-Al2O3 Showed Different Growth Mechanism during the Calcination Process. the Average Grain Size of the Calcined Powder Increased from ~40 to ~900 Nm as the Calcination Temperature Increased from 1200 to 1600 °C.

scholarly journals Physical Properties Study of Zn<sub>0.5</sub>Mn<sub>0.5&#8722;x</sub>Li<sub>2x</sub>Fe<sub>2</sub>O<sub>4</sub> Nanoparticle Series that Prepared by Co-Precipitation Method

2019 ◽  
Vol 07 (11) ◽  
pp. 15-21
Author(s):  
N. A. Elthair ◽  
Yousef A. Alsabah ◽  
Eltayeb M. Mustafa ◽  
Abdelrahman A. Elbadawi ◽  
Abdal Sakhi Suliman ◽  
...  
Keyword(s):  
Physical Properties ◽  
Precipitation Method ◽  
Co Precipitation

On the Role of NaCl Addition to Phase Transformation of TiO2 from TiCl3

2015 ◽  
Vol 1112 ◽  
pp. 313-316 ◽  
Author(s):  
Irana Eka Putri ◽  
Herny Ariesta Budiarti ◽  
Dyah Sawitri ◽  
Doty D. Risanti
Keyword(s):  
Phase Transformation ◽  
Titanium Dioxide ◽  
Titanium Dioxide Nanoparticles ◽  
Rutile Phase ◽  
The Other ◽  
Precipitation Method ◽  
Control Solution ◽  
Key Points ◽  
Co Precipitation

Phase transformation of TiO2 (titanium dioxide) nanoparticles has been analyzed by observing the effect of NaCl addition to the anatase-to-rutile phase transformation. NaCl is one of key points in the transformation of rutile. Co-precipitation method was employed in which TiCl3 as precursor was reacted with HCl 2M and subsequent NH4OH. Three methods were studied, namely solution without NaCl addition (TiCl3 + HCl + NH4OH) as control solution subjected to route A (TiCl3 + HCl – NaCl– NH4OH – heated at 600°C for 5 hours) and route B (TiCl3 + NaCl – heated 200°C for 5 hours – NH4OH – heated 200°C for 6 hours). Route B was subjected to heating at 200°C. The results show that without NaCl it enhanced the crystal growth of the rutile embryos allowing the ease of rutile formation at 600°C, while route A promoted the transformation of brookite and hindered anatase-to-rutile transformation as indicated by the presence of anatase at 1000°C. On the other hand route B is potential for being further explored.

INVESTIGATIONS ON NANOCRYSTALLINE SUPERPARAMAGNETIC PARTICLES OF CoFe2O4

2007 ◽  
Vol 06 (06) ◽  
pp. 515-519 ◽  
Author(s):  
R. P. PANT ◽  
VINOD KUMAR ◽  
S. K. HALDER ◽  
S. K. GUPTA ◽  
SUKHVIR SINGH
Keyword(s):  
Physical Properties ◽  
Cobalt Ferrite ◽  
Annealing Effect ◽  
Precipitation Method ◽  
Vibrating Sample Magnetometer ◽  
Paramagnetic Resonance ◽  
X Ray ◽  
Transmission Electron ◽  
Co Precipitation ◽  
Electron Paramagnetic

Superparamagnetic (SP) crystalline cobalt ferrite ( CoFe 2 O 4) nanoparticles are synthesized by chemical co-precipitation method. Grown nanoparticles are annealed in air at various temperatures in the range 373 K to 1173 K to understand the variation in properties in nanoregion. Physical properties are analyzed for crystalline phase, crystallite size, particle size, shape, magnetization and relaxation behavior by using various characterization techniques viz. X-ray diffractometer (XRD), transmission electron microscope (TEM), vibrating sample magnetometer (VSM) and electron paramagnetic resonance (EPR). Annealing effect on various physical properties of particles are investigated. Particles are used in the development of stable ferrofluid.

scholarly journals Synthesis and Characterization of Soft Magnetic Materials NixZn1-xFe2O4 (x = 0,2 – 0,8) Lombok Iron Sand with Co-precipitation Method

2021 ◽  
Vol 3 (1) ◽  
pp. 21-28
Author(s):  
Nining S Asri
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Physical Properties ◽  
Nickel Content ◽  
Average Particle Size ◽  
Precipitation Method ◽  
Average Particle ◽  
True Density ◽  
Soft Magnetic ◽  
Co Precipitation

The synthesis of soft magnetic NixZn1-xFe2O4 with variations in composition (x = 0,2 – 0,8) by the co-precipitation method has been carried out. The research objective was to determine the effect of x variation on the crystal structure, microstructure, magnetic properties, and density. The samples were characterized by their crystal structure using XRD, microstructure using FE-SEM, magnetic properties using VSM, and physical properties (True Density). The XRD analysis results obtained two phases, the major phase is nickel-zinc ferrite, and Fe2O3 shows as the minor phase. The crystal size increased and the lattice parameters decreased with the increase in nickel content. The results of FE-SEM analysis at x = 0.2 are spherical in shape with an average particle size found about 47.07 nm. The results of VSM analysis showed that the increase in nickel content, the higher the magnetization saturation value, and the super-paramagnetic properties of all samples obtained. The results of the analysis of physical properties show that true density decreases with an increase of nickel content in each sample.

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