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Polytypoids in high Tc thallium based superconducting materials

Published online by Cambridge University Press:  31 January 2011

A. K. Singh ,
M. A. Imam ,
K. Sadananda ,
S. B. Qadri ,
E. F. Skelton ,
M. S. Osofsky ,
V. Le Tourneau  and
D. U. Gubser
A. K. Singh
Affiliation:
Materials Science and Technology Division, Naval Research Laboratory, Washington, DC 20375
M. A. Imam
Affiliation:
Materials Science and Technology Division, Naval Research Laboratory, Washington, DC 20375
K. Sadananda
Affiliation:
Materials Science and Technology Division, Naval Research Laboratory, Washington, DC 20375
S. B. Qadri
Affiliation:
Materials Science and Technology Division, Naval Research Laboratory, Washington, DC 20375
E. F. Skelton
Affiliation:
Materials Science and Technology Division, Naval Research Laboratory, Washington, DC 20375
M. S. Osofsky
Affiliation:
Materials Science and Technology Division, Naval Research Laboratory, Washington, DC 20375
V. Le Tourneau
Affiliation:
Materials Science and Technology Division, Naval Research Laboratory, Washington, DC 20375
D. U. Gubser
Affiliation:
Materials Science and Technology Division, Naval Research Laboratory, Washington, DC 20375
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Abstract

Several high Tc compounds containing Tl (thallium) were prepared starting from different initial compositions. Superconducting properties and the structure were determined for each sample. Electron diffraction and transmission electron microscopy showed the existence of polytypic high Tc compounds with the same a- and b-axes but different c-axis values. The c-axis appears to increase approximately in integral multiples of 0.15 nm with varying composition and is associated with the insertion of Cu–Ca or Cu–Tl layers in each unit cell. Several random stacking faults were also noted, which give rise to diffuse streaking in the electron diffraction pattern.

Type
Articles
Information
Journal of Materials Research , Volume 5 , Issue 8 , August 1990 , pp. 1620 - 1624
Copyright
Copyright © Materials Research Society 1990

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