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nanocrystalline zno powder prepared by high energy

(PDF) Nanocrystalline ZnO Powder Prepared by High

A nanocrystalline powder of nonstoichiometric vanadium carbide VC0.875 has been prepared by the high-energy ball milling method. The crystal structure, microstructure, morphology, and size ...

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Nanocrystalline ZnO powder prepared by high energy ball ...

01/07/2013  Nanocrystalline ZnO powder prepared by high energy ball mill Abstract: We have obtained zinc oxide (ZnO) in the form of nanocrystallites with crystallite sizes from 46 nm to 3 nm by milling 1.4 micron ZnO powders in the high energy ball mill (HEBM) for the different times: 1, 5 and 8 hours. Crystal structure changes of the ZnO nanocrystallites were studied by x-ray diffraction

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Nanocrystalline ZnO Powder Prepared By High Energy Ball Mill

Nanocrystalline ZnO Powder Prepared By High Energy Ball Mill G ... milling 1.4 micron ZnO powders in the high energy ball mill (HEBM) for the different times: 1, 5 and 8 hours. Crystal structure ...

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Nanocrystalline ZnO powder prepared by high energy ball ...

Nanocrystalline ZnO powder prepared by high energy ball mill July 2013 Conference: The 8th International Forum on Strategic Technology 2013, At IEEE Conference Publications

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Nanocrystalline ZnO powder prepared by high energy ball

Nanocrystalline ZnO powder prepared by high energy ball mill We have obtained zinc oxide (ZnO) in the form of nanocrystallites with crystallite sizes from 46 nm to 3 nm by milling 1.4 micron ZnO powders in the high energy ball mill (HEBM) for the different times: 1, 5 and 8 hours. Crystal structure changes of the ZnO nanocrystallites were studied by x-ray diffraction techniquies. It was ...

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Mechanochemical synthesis of nanocrystalline SnO2–ZnO ...

06/01/2006  Mechanochemical processing of anhydrous chloride precursors with Na 2 CO 3 has been investigated as a means of manufacturing nanocrystalline SnO 2 doped ZnO photocatalysts. High-energy milling and heat-treatment of a 0.1SnCl 2 +0.9ZnCl 2 +Na 2 CO 3 +4NaCl reactant mixture was found to result in the formation of a composite powder consisting of oxide grains embedded within a

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Synthesis of Wurtzite Nano-crystalline ZnO-CoO Pigment by ...

Synthesis of Wurtzite Nano-crystalline ZnO-CoO Pigment by High Energy Milling S ... for processing nanocrystalline and amorphous solid materials. This method is employed in mineral processing [1 ...

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Synthesis of nanocrystalline ZnO powder using ultrasonic ...

large-band gap energy of 3.37 eV at low temperature and 3.3 eV at room temperature [30], and with high sensitivity to toxic and combustible gases [4-10]. 2 Experimental 2.1. Preparation of nanocrystalline ZnO powder The nanocrystalline ZnO powder was prepared by ultrasonic atomization technique as shown in fig. 1. Figure 1: Ultrasonic atomization technique for the preparation of ...

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Reactive ball milling to produce nanocrystalline ZnO ...

15/09/2008  TEM of the nanocrystalline ZnO powder produced after 100 h of milling. (a) General morphology of particles. (b) A bright-field image of a typical particle. (c) SAED pattern taken from the particle (b). (c) High-resolution image of a fragment of the particle. According to element analysis data obtained by X-ray energy dispersive spectroscopy in an electron microscope, the as-prepared

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nanocrystalline zno powder prepared by high energy

Nanocrystalline ZnO Powder Prepared By High Energy Ball Mill. Nanocrystalline ZnO Powder Prepared By High Energy Ball Mill G.Batdemberel *, T. Battumur *, G.Oyungerel **, Sh.Chadraabal *, G.Tsermaa *, P.Munkhbaatar *, D.Sangaa. Get Price. Structure and magnetic properties of nanocrystalline Ni Zn . 4 powder prepared by ball milling as a The initial high purity (.99%) powders of 12?3 wt-%ZnO ...

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Structure and magnetic properties of ball-mill prepared ...

05/03/2013  In this study, nanocrystalline Ni 0.64 Zn 0.36 Fe 2 O 4 powders were prepared by high energy ball milling of ZnO, NiO and Fe 2 O 3 powder mixtures. The synthesized powders were heat treated at different temperatures varying from 400 °C to 750 °C. Structural properties of the as-milled and the post-heat treated powders were studied by means of X-ray diffraction (XRD) technique, scanning ...

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Fabrication of (Y 2 O 3 )n–ZnO nanocomposites by high ...

The photodegradation of Congo red dye by (Y2O3)n ZnO photocomposites was investigated through a sequence of experiments. X-ray diffraction analysis indicates nanocomposites' evolution having the ZnO wurtzite structure with increase in crystallite size and Y2O3 phase segregation, as confirmed by the appearance and gradual growth of the Y2O3 peak. Field emission scanning electron microscopy ...

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Fabrication, structure and magnetic properties of ...

01/03/2005  A nanocrystalline NiZn-ferrite can be fabricated by a high-energy milling method with Fe 3 O 4 +NiO+ZnO. A typical grain is 10–50 nm after being milled for about 100 h while the powder has a single-phase NiZn-ferrite structure. The typical value of the saturation magnetization measures 45 emu/g and 367 Oe of coercivity. No superparamagnetic behavior was observed in the current experiment ...

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Analysis of Nanocrystalline and Microcrystalline ZnO ...

21/04/2006  Master sintering curves were constructed for dry‐pressed compacts composed of either a nanocrystalline or a microcrystalline ZnO powder using constant heating rate dilatometry data and an experimentally determined apparent activation energy for densification of 268±25 and 296±21 kJ/mol, respectively. The calculated activation energies for densification are consistent with one another, and ...

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Preparation of nanocrystalline microwave dielectric Zn

Abstract. Nanocrystalline microwave dielectrics ZnTiO 3 and Zn 2 TiO 4 (spinel) phase have been prepared by high-energy ball milling the powder mixture of ZnO and anatase ( a)-TiO 2.Ball milling of equimolar powder mixture of ZnO and a-TiO 2 is continued up to 6 h with some intermediate milling steps. Microstructure of all the samples is characterized by Reitveld's structure refinement method ...

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Mechanochemical synthesis of nanocrystalline

06/01/2006  Mechanochemical processing of anhydrous chloride precursors with Na 2 CO 3 has been investigated as a means of manufacturing nanocrystalline SnO 2 doped ZnO photocatalysts. High-energy milling and heat-treatment of a 0.1SnCl 2 +0.9ZnCl 2 +Na 2 CO 3 +4NaCl reactant mixture was found to result in the formation of a composite powder consisting of oxide grains embedded within a

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Varistors prepared from nanocrystalline powders

ZnO based varistors, which protect electrical equipment against overvoltages, have been used for several years. They are electrical devices whose resistance varies non-linearly with the applied voltage. The material in these devices has two main components: conducting ZnO grains surrounded by non-conducting Bi2O3-rich grain boundaries. At low voltages, the electrons are trapped in the ...

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Reactive ball milling to produce nanocrystalline ZnO ...

15/09/2008  TEM of the nanocrystalline ZnO powder produced after 100 h of milling. (a) General morphology of particles. (b) A bright-field image of a typical particle. (c) SAED pattern taken from the particle (b). (c) High-resolution image of a fragment of the particle. According to element analysis data obtained by X-ray energy dispersive spectroscopy in an electron microscope, the as-prepared

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Dye-SensitizedSolarCellsBasedonHighSurfaceArea ...

The nanocrystalline zinc oxide spheres show 1.0% of energy conversion efficiency for dye-sensitized solar cells. 1.Introduction Dye-sensitized solar cells (DSCs) have attracted great atten-tion,dueitsadvantagessuchaslowcost,easyfabrication,and high energy conversion efficiency over traditional Si-solar cells [1, 2]. DSCs are composed of porous ...

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Two‐Step Sintering of Nanocrystalline ZnO Compacts:

Two‐step sintering (TSS) was applied on nanocrystalline zinc oxide (ZnO) to control the accelerated grain growth occurring during the final stage of sintering. The grain size of a high‐density (>98%) ZnO compact produced by the TSS was smaller than 1 μm, while the grain size of those formed by the conventional sintering method was ∼4 μm. The results showed that the temperature of both ...

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Nanocrystalline ZnO Powder Prepared By High Enegy

Nanocrystalline ZnO Powder Prepared By High Enegy Ball Mill . Хэвлэлийн нэр: 3. The 8th International Forum on Strategic Technology 2013., Proceedings Volume I, IPOST 2013., 2013 IEEE. Зохиогч: Г.Оюунгэрэл. Хамтран зохиогч: Хэвлүүлсэн огноо: 2013-06-28. Хуудас дугаар: 2013 IEEE6 ISBN: 978-1-4799-0931-5. pp.2-5 ...

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Synthesis of nanocrystalline ZnO powder using ultrasonic ...

large-band gap energy of 3.37 eV at low temperature and 3.3 eV at room temperature [30], and with high sensitivity to toxic and combustible gases [4-10]. 2 Experimental 2.1. Preparation of nanocrystalline ZnO powder The nanocrystalline ZnO powder was prepared by ultrasonic atomization technique as shown in fig. 1. Figure 1: Ultrasonic atomization technique for the preparation of ...

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Nanocrystalline Oxide Ceramics Prepared by High

Studies of grain size effects in nanocrystalline materials require a preparation technique which allows adjustment of the grain size. We prepared various nanocrystalline ceramics by high-energy ball milling. The investigated systems are the oxide ceramics Li 2 O, LiNbO 3, LiBO 2, B 2 O 3, TiO 2 as monophase materials and the composite material ...

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Synthesis, Characterization, and Photocatalytic Activity ...

The X-ray powder diffraction ... and S. Maensiri, “Synthesis and optical properties of nanocrystalline ZnO powders prepared by a direct thermal decomposition route,” Applied Physics A, vol. 94, no. 4, pp. 755–761, 2009. View at: Publisher Site Google Scholar; R. Shankar, R. K. Srivastava, and S. G. Prakash, “ZnO NPs synthesized by thermal decomposition of zinc oxalate at 300°C and ...

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Synthesis of (Mg 0.476Mn

The (Mg 0.476 Mn 0.448 Zn 0.007 )(Fe 1.997 Ti 0.002 )O 4 nanocrystalline powder could be prepared by high energy ball-milling process of raw Fe 3 O 4 , MnO 2 , ZnO, TiO 2 and MgO powders. Prefired and microwave sintered ferrites could achieve the maximum density (4.86 g/cm -3 ), the average grain size (15 μm) was larger than that (10 μm) prepared by prefired and conventionally sintered ...

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Growth Kinetics of Nanocrystalline ZnO Particles from ...

Colloidal chemistry techniques were used to synthesize ZnO particles in the nanometer size regime. The particle aging kinetics were determined by monitoring the optical band edge absorption and using the effective mass model to approximate the particle size as a function of time. We show that the growth kinetics of the ZnO particles follow the Lifshitz−Slyozov−Wagner theory for Ostwald ...

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Sintering Behavior and Electrical Properties of Nanosized ...

Homogeneous and nanosized (28 nm crystallite size) doped‐ZnO ceramic powders were obtained by a metallorganic polymeric method. Calcining and granulating

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Microstructure, Magnetic and Mössbauer Studies of ...

This subject mainly concerned the structural and magnetic properties evolution of Fe50Co25Ni25 nanocrystalline powder mixture prepared by mechanical alloying in a high-energy planetary ball mill under argon atmosphere. For extended milling time of 100 h, two nanocrystalline Fe (Co,Ni) (∼ 87 nm) and fcc-Co-rich (∼ 47 nm) phases were identified. This phase transformations, dependent on the ...

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High-energy grinding of FeMo powders Journal of ...

31/01/2011  High-energy grinding of FeMo powders - Volume 22 Issue 6 - M. D’Incau, M. Leoni, P. Scardi

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Tetragonal Nanocrystalline Barium Titanate Powder ...

20/12/2004  Nanocrystalline tetragonal‐BaTiO 3 powder was prepared using a hydrothermal method, under moderate conditions, and with a high precursor concentration. Characterization via X‐ray diffractometry and differential scanning calorimetry confirmed that the average particle size and tetragonal content of the prepared powder were 70 nm and 80%, respectively.

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Synthesis of High Crystalline Al-Doped ZnO

Abstract. High crystalline Al-doped ZnO (AZO) nanopowders were prepared by in-flight treatment of ZnO and Al 2 O 3 in Radio-Frequency (RF) thermal plasma. Micron-sized (~1 μm) ZnO and Al 2 O 3 powders were mixed at Al/Zn ratios of 3.3 and 6.7 at.% and then injected into the RF thermal plasma torch along the centerline at a feeding rate of 6.6 g/min. The RF thermal plasma torch system was ...

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Preparation of nanocrystalline microwave dielectric Zn

Abstract. Nanocrystalline microwave dielectrics ZnTiO 3 and Zn 2 TiO 4 (spinel) phase have been prepared by high-energy ball milling the powder mixture of ZnO and anatase ( a)-TiO 2.Ball milling of equimolar powder mixture of ZnO and a-TiO 2 is continued up to 6 h with some intermediate milling steps. Microstructure of all the samples is characterized by Reitveld's structure refinement method ...

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Photocatalytic activity of nanocrystalline ZnO, α-Fe 2 O

Nanocrystalline powders of ZnO, α-Fe2O3 and ZnFe2O4/ZnO were prepared by solution combustion method. The characterization of the nano powders was done by powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The ZnO and α-Fe2O3 nanopowders exhibited the wurtzite and hexagonal phases, respectively.

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Red-Shift Effect and Sensitive Responsivity of MoS2/ZnO ...

Nanocrystalline MoS 2 (from Alfa Aesar, 325 mesh, 99 %) was prepared using a high-energy ball-milling method. MoS 2 was milled in ceramic milling vials (zirconia) using zirconia balls for 10, 20, and 40 h. The ball-to-powder weight ratio was 2:1 to produce at least 2 g of nanopow-der. The mechanical milling was performed in a hori- zontal oscillatory mill (Retsch, PM 400) operating at 25 Hz ...

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Structure and magnetic properties of nanocrystalline Ni Zn ...

4 powder prepared by ball milling as a function of milling time. It would be worth mentioning that as compared with the literature in this field, this paper has paid special attention to Ni 0?64Zn 0?36Fe 2O 4 ferrite composition. Experimental method The initial high purity (.99%) powders of 12?3 wt-%ZnO, 20 ?2wt-%NiO and 675wt-%Fe 2O 3 were weighed and mixed according to the composition of Ni ...

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Synthesis of (Mg 0.476Mn

The (Mg 0.476 Mn 0.448 Zn 0.007 )(Fe 1.997 Ti 0.002 )O 4 nanocrystalline powder could be prepared by high energy ball-milling process of raw Fe 3 O 4 , MnO 2 , ZnO, TiO 2 and MgO powders. Prefired and microwave sintered ferrites could achieve the maximum density (4.86 g/cm -3 ), the average grain size (15 μm) was larger than that (10 μm) prepared by prefired and conventionally sintered ...

More

Dye-SensitizedSolarCellsBasedonHighSurfaceArea ...

The nanocrystalline zinc oxide spheres show 1.0% of energy conversion efficiency for dye-sensitized solar cells. 1.Introduction Dye-sensitized solar cells (DSCs) have attracted great atten-tion,dueitsadvantagessuchaslowcost,easyfabrication,and high energy conversion efficiency over traditional Si-solar cells [1, 2]. DSCs are composed of porous ...

More

Growth Kinetics of Nanocrystalline ZnO Particles from ...

Colloidal chemistry techniques were used to synthesize ZnO particles in the nanometer size regime. The particle aging kinetics were determined by monitoring the optical band edge absorption and using the effective mass model to approximate the particle size as a function of time. We show that the growth kinetics of the ZnO particles follow the Lifshitz−Slyozov−Wagner theory for Ostwald ...

More

Effect of γ-irradiation on structural parameters and ...

The ZnO powder was prepared by sol-gel method. The microstructure and surface morphology of ZnO powder were characterized by thermo gravimetric (T G) analysis, differential scanning calorimeter (DSC) and X-ray diffraction (XRD). Thin film of ZnO was prepared using thermal evaporation technique. The effect of γ -irradiation with different doses (100, 300 and 500 kGy) on the structural and ...

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Tetragonal Nanocrystalline Barium Titanate Powder ...

20/12/2004  Nanocrystalline tetragonal‐BaTiO 3 powder was prepared using a hydrothermal method, under moderate conditions, and with a high precursor concentration. Characterization via X‐ray diffractometry and differential scanning calorimetry confirmed that the average particle size and tetragonal content of the prepared powder were 70 nm and 80%, respectively.

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