scholarly journals DETERMINATION OF OXYGEN CONTENT IN HIGH Tc SUPERCONDUCTORS BY DEUTERON PARTICLE ACTIVATION ANALYSIS

1993 ◽  
Vol 42 (2) ◽  
pp. 326
Author(s):  
TAO ZHEN-LAN ◽  
D.E. AlBURGER ◽  
K.W. JONES ◽  
Y.D. YAO ◽  
Y.H. KAO
Keyword(s):  
Activation Analysis ◽  
Oxygen Content ◽  
High Tc Superconductors ◽  
High Tc ◽  
Particle Activation

The many faces of STEM in materials science

1991 ◽  
Vol 49 ◽  
pp. 440-441
Author(s):  
John Silcox
Keyword(s):  
Materials Science ◽  
Auger Spectroscopy ◽  
Dark Field ◽  
High Tc Superconductors ◽  
High Tc ◽  
Acoustic Environment ◽  
Electromagnetic Vibration ◽  
The Many ◽  
Serial Mode

Determination of the microstructure and microchemistry of small features often provides the insight needed for the understanding of processes in real materials. In many cases, it is not adequate to use microscopy alone. Microdiffraction and microspectroscopic information such as EELS, X-ray microprobe analysis and Auger spectroscopy can all contribute vital parts of the picture. For a number of reasons, dedicated STEM offers considerable promise as a quantitative instrument. In this paper, we review progress towards effective quantitative use of STEM with illustrations drawn from studies of high Tc superconductors, compound semiconductors and metallization of H-terminated silicon.Intrinsically, STEM is a quantitative instrument. Images are acquired directly by detectors in serial mode which is particularly convenient for digital image acquisition, control and display. The VG HB501A at Cornell has been installed in a particularly stable electromagnetic, vibration and acoustic environment. Care has been paid to achieving UHV conditions (i.e., 10-10 Torr). Finally, it has been interfaced with a VAX 3200 work station by Kirkland. This permits, for example, the acquisition of bright field (or energy loss) images and dark field images simultaneously as quantitative arrays in perfect registration.

Direct Determination of the Velocity of Vortices in High-Tc Superconductors by a Non-Equilibrium Method

1998 ◽  
Vol 12 (29n31) ◽  
pp. 3288-3291
Author(s):  
I. Kirschner ◽  
R. Laiho ◽  
A. C. Bódi ◽  
E. Lähderanta ◽  
I. Vajda
Keyword(s):  
Magnetic Field ◽  
Temperature Gradient ◽  
Vortex Motion ◽  
Direct Determination ◽  
Field Investigation ◽  
High Tc Superconductors ◽  
High Tc ◽  
Pinning Centers ◽  
Non Equilibrium

As is shown, thermally assisted vortex motion can come into being in high-T c superconductors due to the applied temperature gradient. Its behavior strongly depends on the local and global microstructure of the samples, moreover on the temperature and magnetic field. Investigation of the density, size and intensity of the pinning centers of specimens leads to the conclusion that the higher homogeneity immediately weakens and the lower one strenghtens the pinning, thus the former promotes and the latter impedes the vortex motion. The non-equilibrium experimental technique together with a.c. susceptibility measurements render possible the direct determination of the velocity of vortices. Depending on the actual microstructural state of samples it has the values between 6 × 10-2 mm/s and 18 × 10-2 mm/s in the case of Y-Ba-Cu-O specimens investigated.

Determination of oxygen content in highTcsuperconductors by a charged particle activation method

1988 ◽  
Vol 53 (15) ◽  
pp. 1440-1442 ◽  
Author(s):  
Z. Tao ◽  
D. E. Alburger ◽  
K. W. Jones ◽  
Y. D. Yao ◽  
Y. H. Kao
Keyword(s):  
Charged Particle ◽  
Oxygen Content ◽  
Activation Method ◽  
Charged Particle Activation ◽  
Particle Activation

TWO-DIMENSIONAL ANTIFERROMAGNETIC ORDERING IN HIGH-Tc SUPERCONDUCTORS WITH LOW OXYGEN CONTENT

1989 ◽  
Vol 03 (05) ◽  
pp. 711-717 ◽  
Author(s):  
YU. T. PAVLUKHIN ◽  
N. G. HAINOVSKY ◽  
YA. YA. MEDIKOV ◽  
A. I. RYKOV
Keyword(s):  
Oxygen Content ◽  
Two Dimensional ◽  
Low Oxygen ◽  
High Tc Superconductors ◽  
High Tc ◽  
Antiferromagnetic Ordering
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