LOW TEMPERATURE SYNTHESIS AND OPTICAL PROPERTIES OF (Cu, Cr, Fe)Al2O4 NANOCRYSTALLINE SPINEL MATERIALS

2011 ◽  
Vol 10 (04n05) ◽  
pp. 861-865 ◽  
Author(s):  
T. P. YADAV ◽  
DEVINDER SINGH ◽  
N. K. MUKHOPADHYAY ◽  
M. A. SHAZ ◽  
R. S. TIWARI ◽  
...  
Keyword(s):  
Spinel Structure ◽  
Annealing Temperature ◽  
Quasicrystalline Phase ◽  
Emission Characteristics ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Different Temperatures ◽  
B2 Phase ◽  
Optimum Annealing Temperature ◽  
Spinel Materials

In the present investigation, ( Cu, Cr, Fe ) Al 2O4 spinel was synthesized from decagonal quasicrystalline precursor using mechanical milling followed by air annealing. The optimum annealing temperature and time were found to be 600°C and 60 h respectively. The evolution of the spinel structure started upon air annealing at 600°C from the B2 phase formed due to milling of quasicrystalline phase for 40 h. The relevant optical property of mechanically milled and air annealed samples prepared at different temperatures (400°C, 500°C and 600°C) were evaluated by photoluminescence technique. These studies suggested the presence of emission characteristics in blue region i.e. at 430 nm.

THE INVESTIGATION ON STABILITY AND STRUCTURAL PROPERTIES OF COHESION-BASED NANOSTRUCTURES MATERIAL

2013 ◽  
Vol 27 (27) ◽  
pp. 1350153 ◽  
Author(s):  
ALI BAHARI ◽  
REZA GHOLIPUR ◽  
MARYAM DERAKHSHI
Keyword(s):  
Annealing Temperature ◽  
Sol Gel ◽  
Growth Mode ◽  
X Ray Diffraction ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
X Ray ◽  
Annealing Temperatures ◽  
Atomic Force ◽  
Transmission Electron

Styrene-doped ZrLaO y nanostructures were obtained by sol–gel method low-temperature synthesis. The nanostructures were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), atomic force microscope (AFM) and transmission electron microscopy (TEM) techniques. The observation using SEM and TEM revealed that the ring-shaped nanostructures were very uniform. Further characterization using XRD disclosed that the cohesion of the samples was controllable with annealing temperatures in the range of 800–1500°C. Cohesion property was investigated for the samples. The cohesion increased when increasing the annealing temperature. This was linked to the reinforcement of the oxygen bound on the ZrLaO y nanostructures The shape of nanostructures showed a transformation from a ring-shaped growth mode to a hole-surfaced growth mode with increasing annealing temperature. The styrene-doped ZrLaO y nanostructures with controllable crystallinity will have great potential for various applications in fuel, cells, batteries, electronics devices and chemical sensors.

Low-temperature synthesis of ribbon-like orthorhombic NaNbO3 fibers and their photocatalytic activities for H2 evolution

RSC Advances ◽  
2015 ◽  
Vol 5 (42) ◽  
pp. 33001-33007 ◽  
Author(s):  
Deqing Zhang ◽  
Junye Cheng ◽  
Feng Shi ◽  
Zhangjie Cheng ◽  
Xiuying Yang ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Low Temperature ◽  
Hydrothermal Method ◽  
Annealing Temperature ◽  
H2 Evolution ◽  
Post Heat Treatment ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Photocatalytic Activities

Ribbon-like orthorhombic NaNbO3 fibers were successfully prepared by combining a traditional hydrothermal method with post-heat treatment at a low annealing temperature.

Mechanically Activated Low-Temperature Synthesis of Ti2SnC

2007 ◽  
Vol 336-338 ◽  
pp. 955-957 ◽  
Author(s):  
Shi Bo Li ◽  
Hong Xiang Zhai ◽  
Guo Ping Bei ◽  
Yang Zhou
Keyword(s):  
Low Temperature ◽  
Smooth Surface ◽  
Charge Ratio ◽  
Ceramic Powders ◽  
Mechanically Alloyed ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Different Temperatures ◽  
Novel Method ◽  
A Charge

Ti2SnC has been fabricated from Ti, Sn and graphite elemental powders by mechanically activated low-temperature synthesis (MALS) technique. Superfine powders were obtained after milling the elemental powders for only 1 h with a charge ratio of 20:1. The mechanically alloyed powders were then pressureless sintered at different temperatures at Ar atmosphere for 0.5 h. High content of Ti2SnC was obtained at 950 oC, which is lower than the previously reported temperatures of above 1200 oC by sintering the conventional mixture powders. The microstructure shows that Ti2SnC grains with plate-like shape and smooth surface are less than 5 μm in size. The result demonstrates that the MALS is a novel method for the synthesis of Ti2SnC or other ceramic powders.

Synthesis and Deposition of Rutile TiO2 for Dye-Sensitized Solar Cell Applications

2019 ◽  
Author(s):  
Blen Teferi ◽  
Udo Schnupf ◽  
Kazuhiro Manseki ◽  
Takashi Sugiura ◽  
Saeid Vafaei
Keyword(s):  
Tio2 Nanoparticles ◽  
Dye Sensitized Solar Cells ◽  
Tio2 Films ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Rutile Tio2 ◽  
Dye Sensitized ◽  
Different Temperatures ◽  
Sensitized Solar Cells ◽  
Hydrothermal Methods

Abstract The purpose of this research was to produce semiconductor Rutile TiO2 films using a new deposition method on F-doped SnO2 (FTO) glasses i.e. nanofluid boiling method, using TiO2 nanoparticles. A low-temperature synthesis without using conventional hydrothermal methods was established to obtain the Rutile TiO2 nanoparticles with different size and shape under different temperatures. The crystalline TiO2 was separated from the reaction liquid by centrifugation and dried under ambient condition. The current boiling deposition of the TiO2 nanofluid was found to form porous semiconductor TiO2 nanoparticle films without cracks in the deposited TiO2 film. The obtained TiO2 films will be utilized as TiO2 photoanodes in dye-sensitized solar cells.

Low Temperature Synthesis of Magnetite and Maghemite Nanoparticles

2007 ◽  
Vol 7 (12) ◽  
pp. 4294-4302 ◽  
Author(s):  
Shrikant Bhagwat ◽  
Hema Singh ◽  
Anjali Athawale ◽  
Beatrice Hannoyer ◽  
Samuel Jouen ◽  
...  
Keyword(s):  
Ferromagnetic Phase ◽  
Maghemite Nanoparticles ◽  
Reaction Sequence ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Simple Chemical ◽  
Different Temperatures ◽  
The Stability ◽  
Ferrous Ammonium ◽  
Magnetite Phase

We report on the synthesis of iron oxide nanoparticles below 100 °C by a simple chemical protocol. The uniqueness of the method lies in the use of Ferrous ammonium sulphate (in conjugation with FeCl3) which helps maintain the stability of Fe2+ state in the reaction sequence thereby controlling the phase formation. Hexamine was added as the stabilizer. The nanoparticles synthesized at three different temperatures viz, 5°, 27°, and 95 °C are characterized by several techniques. Generally, when a mixture of Fe3+ and Fe2+ is added to sodium hydroxide, α-Fe2O3 (the anti-ferromagnetic phase) is formed after the dehydration process of the hydroxide. In our case however, the phases formed at all the three temperatures were found to be ferro (ferri) magnetic, implying modification of the formation chemistry due to the specifics of our method. The nanoparticles synthesized at the lowest temperature exhibit magnetite phase, while increase in growth temperature to 95 °C leads to the maghemite phase.

Modified Synthesis Temperature of Ba3 Co1.7 Ni0.1 Cu0.1 Mn0.1 Fe24 O41 Z-Type Ferrite Nanoparticles Prepared by Co-Precipitation Method

2013 ◽  
Vol 829 ◽  
pp. 737-741 ◽  
Author(s):  
Mohammad Javad Pourhosseini Asl ◽  
Ali Ghasemi ◽  
Gholam Reza Gordani
Keyword(s):  
Low Temperature ◽  
Synthesis Temperature ◽  
Precipitation Method ◽  
Diffraction Field ◽  
X Ray Diffraction ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Optimum Synthesis ◽  
Different Temperatures ◽  
Co Precipitation

In this study, the low temperature synthesis of barium-Z type hexaferrite nanoparticles was considered. In this manner, the Z-type hexaferrite with the chemical composition of Ba3 Co1.7 Ni0.1 Cu0.1 Mn0.1 Fe24 O41 was synthesized at different temperatures of 900, 1000 and 1100 0C for 3hr. An X-Ray diffraction, field emission scanning electron microscopy (FE-SEM) and a vibrating sample magnetometer (VSM) analysis were carried out to investigate structural and magnetic properties of samples. XRD results showed that the Z-type ferrite phase was formed in all samples. However, At the low temperature synthesis (T=900 0C), the Ba2Me2Fe12O22 and BaFe2O4 phases were also detected. FE-SEM micrographs showed that with increasing the synthesis temperature, the particle size was increased. It was found that the saturation of magnetization was slightly increased from 54 to 55. 5emugr with an increase in synthesis temperature from 900 to 11000C, while the coercivity increased initially from 670 Oe to 860 Oe and then decreased to 488 Oe. The results also indicated that the temperature of 10000C was the optimum synthesis temperature of Ba-Z type hexaferrite nanoparticles, which was much lower than that of Z-type hexaferrite produced by previous researchers.

Synthesis and Luminescent Properties of Porous YVO4:Sm Nanoplates

2009 ◽  
Vol 620-622 ◽  
pp. 541-544 ◽  
Author(s):  
Ju An Wang ◽  
Yun Hua Xu ◽  
Qihong Cen ◽  
Xiao Man Zhang ◽  
Ya Ru Cui
Keyword(s):  
Low Temperature ◽  
Ethylene Glycol ◽  
Luminescence Intensity ◽  
Annealing Temperature ◽  
Luminescent Properties ◽  
Precipitation Method ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Preparation Methods ◽  
Co Precipitation

The present research describes a simple low-temperature synthesis route of fabricating porous YVO4:Sm nanoplates via a chemical co-precipitation method using commercially available Y2O3, NH4VO3, Sm2O3 and ethylene glycol as the reacting precursors. The as-synthesized YVO4:Sm was thermally treated at 300°C and 600°C for 2 h which is much lower than that of the conventional preparation methods. The obtained samples were characterized by FTIR, XRD, TEM and PL. The photoluminescence measurement revealed that the luminescence intensity was significantly increased with increasing annealing temperature.

Low Temperature Synthesis of Nanocrystalline ZnFe2O4 Powders

2006 ◽  
Vol 518 ◽  
pp. 91-94 ◽  
Author(s):  
Marija Maletin ◽  
Željka Cvejić ◽  
S. Rakić ◽  
L.M. Nikolić ◽  
Vladimir V. Srdić
Keyword(s):  
Spinel Structure ◽  
Single Phase ◽  
Direct Synthesis ◽  
Average Crystallite Size ◽  
Precipitation Method ◽  
Ceramic Powders ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Nanoscale Electronics ◽  
Co Precipitation

Advances in nanoscale electronics require superior ceramic powders, preferable prepared with techniques for the direct synthesis of crystalline nanoparticles. Zinc ferrite (ZnFe2O4) nanopowders were prepared by co-precipitation method, from nitrate precursors. Crystalline powders having the single-phase cubic spinel structure were directly synthesized at temperature ≥80°C in the presence of NaOH. The obtained powders are agglomerated with ultra-fine crystallites having the average crystallite size about 3-4 nm.

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