Solvothermal synthesis of zirconia and yttria-stabilized zirconia nanocrystalline particles

2007 ◽  
Vol 22 (1) ◽  
pp. 46-55 ◽  
Author(s):  
Xin M. Wang ◽  
Ping Xiao
Keyword(s):  
Electron Microscopy ◽  
Nitrogen Adsorption ◽  
Particle Size Analysis ◽  
Zirconium Hydroxide ◽  
Yttria Stabilized Zirconia ◽  
Size Analysis ◽  
Stabilized Zirconia ◽  
Particle Properties ◽  
Transmission Electron ◽  
Nanocrystalline Particles

A solvothermal method was used to prepare zirconia and yttria-stabilized zirconia (YSZ) particles using zirconium hydroxide and yttrium hydroxide particles as precursors and ethanol or isopropanol as reaction media. The particle properties were characterized with x-ray diffractometry, scanning electron microscopy, transmission electron microscopy, thermal analysis, laser particle-size analysis, nitrogen adsorption (Brunauer–Emmett–Teller method) and Zeta potential analysis. Cubic/tetragonal ZrO2 and YSZ nanocrystals with crystallite size around 5 nm were obtained. The effect of different hydroxide precursors, attrition milling of hydroxide precursors, solvothermal processing conditions, and mineralizer was investigated and discussed by referring to the crystallization process of zirconium hydroxides.

Effect of Coupled Conditions of Thermal Cycle and Dump Environment on Conductivity of 5mol% Yttria Stabilized Zirconia

2013 ◽  
Vol 591 ◽  
pp. 245-248 ◽  
Author(s):  
Jin Feng Xia ◽  
Hong Qiang Nian ◽  
Tao Feng ◽  
Hai Fang Xu ◽  
Dan Yu Jiang
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Transmission Electron Microscopy ◽  
High Temperature ◽  
Thermal Cycle ◽  
Oxygen Sensor ◽  
Yttria Stabilized Zirconia ◽  
Cyclic Change ◽  
Stabilized Zirconia ◽  
Transmission Electron

In some applications such as automotive oxygen sensor, 5mol% Y2O3stabilized zirconia (5YSZ) is generally used because it has both excellent ionic conductivity and mechanical properties. The automotive oxygen sensor would experience a cyclic change from high temperature (engine running) environment to the low temperature damp environment (in the tail pipe when vehicle stops). The conductivity change with coupled conditions of thermal cycle and dump environment in the 5mol%Y2O3ZrO2(5YSZ) system was examined by XRD,Impedance spectroscopy and transmission electron microscopy (SEM) in this paper.

Preparation of Amorphous Nanosilica from Philippine Waste Rice Hull via Acid Precipitation Method

2016 ◽  
Vol 864 ◽  
pp. 112-116
Author(s):  
Rinlee Butch M. Cervera ◽  
Emie A. Salamangkit-Mirasol
Keyword(s):  
Electron Microscopy ◽  
Low Cost ◽  
Agricultural Waste ◽  
Acid Precipitation ◽  
Particle Size Analysis ◽  
Precipitation Method ◽  
Rice Hull ◽  
Size Analysis ◽  
Rice Hull Ash ◽  
Transmission Electron

Rice hull or rice husk (RH) is an agricultural waste obtained from milling rice grains. Since RH has no commercial value and is difficult to use in agriculture, its volume is often reduced through open field burning which is an environmental hazard. In this study, amorphous nanosilica from Philippine waste RH was prepared via acid precipitation method. The synthesized samples were fully characterized for its microstructural properties. X-ray diffraction pattern reveals that the structure of the prepared sample is amorphous in nature while Fourier transform infrared spectrum showed the different vibration bands of the synthesized sample. Scanning electron microscopy (SEM) and particle size analysis (PSA) confirmed the presence of agglomerated silica particles. On the other hand, transmission electron microscopy (TEM) revealed an amorphous sample with grain sizes of about 5 to 20 nanometer range and has about 95 % purity according to EDS analyses. The elemental mapping also suggests that leaching of rice hull ash effectively removed the metallic impurity such as potassium element in the material. Hence, amorphous nanosilica was successfully prepared via a low-cost acid precipitation method from Philippine waste rice hull.

The Evaporative Decomposition of Solutions Method (Eds) for the Production of Ultrafine Y1Ba2Cu3O7 from Nitrate and Mixed Anion Precursor Solutions

1989 ◽  
Vol 169 ◽  
Author(s):  
Rollin E. Lakis ◽  
Sidney R. Butler
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
Barium Carbonate ◽  
Hollow Spheres ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron

AbstractY1Ba2Cu3O7 has been prepared by the evaporative decomposition of solutions method. Nitrate and mixed anion solutions were atomized and decomposed at temperatures ranging from 300°C to 950°C. The resulting materials have been characterized using x-ray powder diffraction, Thermal Gravimetric Analysis (TGA), particle size analysis, Scanning Electron Microscopy (SEM), and Transmission Electron Microscopy (TEM). The powder consists of 0.3 micron agglomerated hollow spheres with a primary particle size of 0.06 micron. TGA and x-ray diffraction indicate the presence of barium nitrate and barium carbonate due to incomplete decomposition and/or product contamination by the process environment.

Application of in situ Transmission Electron Microscopyfor Tribological Investigations of Magnetron Sputter Assisted Pulsed Laser Deposition of Yttria-stabilized Zirconia-gold Composite Coatings

2005 ◽  
Vol 20 (7) ◽  
pp. 1860-1868 ◽  
Author(s):  
J.J. Hu ◽  
A.A. Voevodin ◽  
J.S. Zabinski
Keyword(s):  
Electron Microscopy ◽  
High Temperature ◽  
Composite Coatings ◽  
Pulsed Laser ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
X Ray ◽  
Transmission Electron ◽  
Wide Range

Yttria-stabilized zirconia (YSZ)-Au composite coatings have great potential as solid film lubricants for aerospace applications over a wide range of environmental conditions. They were grown on steel disks or silicon wafers by pulsed laser ablation of YSZ and simultaneous magnetron sputtering of a Au target. Such a combination of ceramics with soft metals improved the toughness of the composite coating and increased its ability to lubricate at high temperature. Information on the time-dependent response of these microstructures to changes in temperature is essential to tribological investigations of high temperature performance. In situ transmission electron microscopy was used to directly measure the dynamic change of YSZ-Au coating structure at elevated temperatures. High-resolution electron microscopy and electron diffraction showed that amorphous YSZ-5 at.% Au coatings proceeded to crystallize under the irradiation of electron beams. Time varying x-ray energy dispersive spectra measured a loss of oxygen in the sample during about 10 min of irradiation with subsequent slight oxygen recovery. This behavior was related to the activation of oxygen diffusion under electron irradiation. X-ray diffraction patterns from vacuum annealed samples verified crystallization of the coatings at 500 °C. Real-time growth of Au nanograins in the sample was observed as the temperature was increased to 500 °C in a TEM specimen holder that could be heated. The grain growth process was recorded using a charge-coupled device camera installed on the transmission electron microscope. The crystallization and growth of zirconia and Au nanograins resulted in low friction during tribological tests. The nucleation of Au islands on heated ball-on-flat specimens was responsible for lowering friction.

Electron Irradiation Damage in Stabilized Cubic Zirconia

2005 ◽  
Vol 475-479 ◽  
pp. 1393-1396
Author(s):  
Kazuhiro Yasuda ◽  
C. Kinoshita ◽  
Syo Matsumura ◽  
A.I. Ryazanov
Keyword(s):  
Electron Microscopy ◽  
Electron Irradiation ◽  
Critical Diameter ◽  
Yttria Stabilized Zirconia ◽  
Irradiation Damage ◽  
Stabilized Zirconia ◽  
Oxygen Sublattice ◽  
Defect Clusters ◽  
Inert Matrix ◽  
Transmission Electron

We report the formation of anomalous defect clusters in yttria stabilized zirconia (YSZ: 13 mol% Y2O3-ZrO2), which are a primary candidate for inert matrix fuels. Electron irradiation with 100 to 1000 keV is found to induce characteristic defect clusters. The defect clusters show strong black/black lobes contrast and multiply dislocations when the defect clusters grow to a critical diameter of 1.0-1.5 µm. Our analysis with transmission electron microscopy and numerical calculations lead to a conclusion that these defect clusters are charged oxygen platelets formed by the selective displacements of oxygen sublattice.

Antiphase boundaries and rotation domains in In2O3(001) films grown on yttria-stabilized zirconia (001)

2014 ◽  
Vol 47 (1) ◽  
pp. 443-448 ◽  
Author(s):  
Yan-Ling Hu ◽  
Eric Rind ◽  
James S. Speck
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Transmission Electron Microscopy ◽  
Dark Field ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Space Group ◽  
Sensor Material ◽  
Transmission Electron ◽  
Scanning Transmission

In2O3is important because it has been widely used as a transparent contact material and an active gas sensor material. To understand and utilize its intrinsic physics as a semiconductor, it is necessary to have In2O3with a high material quality. In this article, single-crystalline (001)-oriented In2O3thin films were grown on yttria-stabilized zirconia (001) substrate, and a group theory analysis and transmission electron microscopy (TEM) experiments were conducted to investigate the defects within the In2O3film. Owing to the reduced symmetry of the bixbyite structure (space group Ia{\overline 3}) in comparison with the fluorite template (space group Fm {\overline 3}m), the formation of antiphase domains and 90° rotation domains in the In2O3thin films is anticipated. This prediction is confirmed experimentally by TEM and high-angle annular dark-field scanning transmission electron microscopy images. The size of the enclosed domains ranges from 50 to 300 nm, and the major domain boundaries are along the (110), (1{\overline 1}0), (010) and (100) planes. The rotation domains are related by a fourfold rotation operation along the 〈001〉 directions, which will cause the permutation of the axes of the bixbyite structure.

Acoustics and Transport Properties of PEG Blended with CuO Nanoparticles: A Novel Application to Heat Transfer

2018 ◽  
Vol 17 (06) ◽  
pp. 1850005 ◽  
Author(s):  
Susmita Kamila ◽  
V. R. Venu Gopal ◽  
B. M. Satish
Keyword(s):  
Heat Transfer ◽  
Electron Microscopy ◽  
Transport Properties ◽  
Colloidal Dispersion ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Heat Transfer Fluids ◽  
Transmission Electron ◽  
Particulate Size ◽  
Powder Samples

The present investigation reports the acoustics and transport properties of a series of colloidal dispersion of nanocopper oxide in polyethylene glycol (PEG-400). The data are presented for five different CuO nanofluids of varying concentration in PEG prepared by the ultrasonication technique. The synthesized powder samples were characterized for their sizes and arrangement by X-ray Diffraction analysis (XRD), Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM), which shows the particulate size to be of nanoscale with elongated shape. Similarly, the size and stability of nanofluids were studied by zeta potential and particle size analysis. Besides, ultrasonic velocity, viscosity measurement show better dispersivity of nanoparticles and molecular environment of the nanofluids, whereas the enhanced thermal as well as electrical conductivities of nanofluids can make them suitable for use as heat transfer fluids.

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