نتایج جستجو برای: Tetragonal

تعداد نتایج: 4117  

2011
Cheng Ji Fuxiang Zhang Dongbin Hou Hongyang Zhu Jianzhe Wu Ming-Chien Chyu Valery I. Levitas Yanzhang Ma

Crystal structure and compressibility of potassium azide was investigated by in-situ synchrotron powder X-ray diffraction in a diamond anvil cell at room temperature up to 37.7 GPa. In the bodycentered tetragonal (bct) phase, an anisotropic compressibility was observed with greater compressibility in the direction perpendicular to the plane containing N3 ions than directions within that plane. ...

Journal: :Journal of synchrotron radiation 2010
Yong Guan Wenjie Li Yunhui Gong Gang Liu Jeff Gelb Xiaobo Zhang Ying Xiong Yangchao Tian Haiqian Wang

The microstructure and morphology of solid-oxide fuel-cell electrodes are very complex but important because they strongly affect the electrical performance of the cell. In this work the high-resolution X-ray nanotomography technique is applied to reconstruct the three-dimensional microstructure of a (La(0.8)Sr(0.2))(0.95)MnO(3) yttria-stabilized zirconia composite cathode. Some key microstruct...

Journal: :iranian journal of hydrogen & fuel cell 2014
ashkan esmaeilifar soosan rowshanzamir amin behbahani

a hydrothermal method for preparation of nano-size zirconia has been studied to optimize the effective parameters (precursor concentration, temperature and time) using response surface methodology (rsm). the synthesized zirconia samples were characterized through x-ray diffraction (xrd), scanning electron microscope (sem) and transmission electron microscopy (tem) analyses to identify mean nano...

Journal: :Nano letters 2010
Dipanjan Mazumdar Vilas Shelke Milko Iliev Stephen Jesse Amit Kumar Sergei V Kalinin Arthur P Baddorf Arunava Gupta

We have investigated the nanoscale switching properties of strain-engineered BiFeO(3) thin films deposited on LaAlO(3) substrates using a combination of scanning probe techniques. Polarized Raman spectral analysis indicates that the nearly tetragonal films have monoclinic (Cc) rather than P4mm tetragonal symmetry. Through local switching-spectroscopy measurements and piezoresponse force microsc...

Journal: :journal of nanostructures 2012
s. asadi h. abdizadeh y. vahidshad

the stabilized zirconia with different cu contents synthesized via sol-gel method. the samples were prepared by hydrolysis and condensation of orgnomatelic sol. after that the result gels were dried at 80 °c and then calcined at various temperatures.  ِ the differential thermal analysis (dta), x-ray diffraction (xrd), field emission scanning electronic microscopy (fesem) and transmission electro...

1997
P. M. Marcus P. Alippi

The tetragonal states produced by isotropic pseudomorphic epitaxial strain in the ~001! plane on a tetragonal phase of a crystal are calculated for V, Ti, Rb, Li, K, and Sr from first-principles electronic theory. It is shown that each metal has two tetragonal phases corresponding to minima of the total energy with respect to tetragonal deformations ~and hence are equilibrium phases! and that t...

1995
Johan Helsing

Diierent bounds on the conductivity of a composite material may improve on each other in diierent conductivity regimes. If so, the question arises of how to eeciently interpolate between the bounds. In this paper we show how to do an interpolation with a two-point Pad e approximation method. For bounds on two-component composites the interpolation method is shown to be, in a sense, the best pos...

2017
P. S. Whitfield N. Herron W. E. Guise K. Page Y. Q. Cheng I. Milas M. K. Crawford

‘Lattice parameters determined from the synchrotron X-ray diffraction scans of the cubic 200 and tetragonal 220/004 Bragg peaks. Fits to the cubic lattice parameter (black solid line) and the average tetragonal lattice parameter (= 2atet + ctet)/3 (blue solid line), were used to determine the linear coefficients of thermal expansion of 1.95 × 10−4 K−1 (cubic) and 2.66 × 10−4 K−1 (tetragonal). T...

Journal: :journal of dental school, shahid beheshti university of medical sciences 0
مریم معزی زاده maryam moezzyzadeh dental school, shahid beheshti university of medical sciences, tehramn- iran.دانشکده دندانپزشکی، دانشگاه علوم پزشکی شهید بهشتی. هانیه نوجه دهیان hanieh nojehdehyan dental school, shahid beheshti university of medical sciences, tehramn- iran.دانشکده دندانپزشکی، دانشگاه علوم پزشکی شهید بهشتی. هاله ولی زاده حقی haleh valizadeh haghi dental school, shahid beheshti university of medical sciences, tehramn- iran.دانشکده دندانپزشکی، دانشگاه علوم پزشکی شهید بهشتی.

objective: a clinical challenge of using zirconia frameworks is to achieve adequate bond with different substrates. this study aimed to evaluate the effect of bioglass and silica coating of zirconia substrates on microshear bond strength of resin cement to tetragonal zirconia. methods: this laboratory experimental study was conducted on zirconia discs. a total of 120 ytzp zirconia (zirkonzahn) ...

2008
MARTIN TRUNEC

Yttria-stabilized tetragonal zirconia polycrystals (Y-TZP) have proved to be important structural ceramics. High strength and fracture toughness make them attractive candidates for a number of demanding applications. It was established that these advantageous properties are strongly influenced by the ceramic microstructure [1]. The relationships between microstructure and mechanical properties ...

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