VARIATION OF THE LATTICE-PARAMETERS OF A BI-BASED SUPERCONDUCTOR WITH TEMPERATURE


HAMDAN N., OZKAN H., ZIQ K., ALBIS B.

PHYSICA C, vol.235, pp.1235-1236, 1994 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 235
  • Publication Date: 1994
  • Doi Number: 10.1016/0921-4534(94)91842-2
  • Title of Journal : PHYSICA C
  • Page Numbers: pp.1235-1236

Abstract

Variation of the lattice parameters and thermal expansion coefficients of Bi-2223 superconductor have been measured from room temperature up to the melting point using X-ray diffraction. The lattice parameters (a and c) gradually increase up to about 250 degrees C. Between 250 degrees C to 450 degrees C the variation of the lattice parameters are quite anomalous, in that a remains almost constant while c decreases. From 450 degrees C to 600 degrees C both parameters gradually increase. Above 650 degrees C the structure of Bi-2223 becomes unstable. The initial thermal expansion coefficient along the c-axis is about four times that along the a-axis. Similar large anisotropy has also been observed in the measurements of the stress of Bi-2223.