Phase transitions and twin lamellae in the (Bi,Pb)2223 phase: in situ high temperature electron diffraction studies.

Zhigadlo, N. D., Czank, M. and Depmeier, W. (2003) Phase transitions and twin lamellae in the (Bi,Pb)2223 phase: in situ high temperature electron diffraction studies. Physica C: Superconductivity, 400 (1-2). pp. 19-24. DOI 10.1016/j.physc.2003.06.001.

Full text not available from this repository.

Supplementary data:

Abstract

Phase transitions and twin lamellae of the (Bi,Pb)2223 phase have been studied by in situ heating experiments in a transmission electron microscope over a range of temperatures 293-800 K. In some crystal grains of the (Bi,Pb)2223 phase a modulation with the modulation wave vector q[congruent with]0.137b* (Pb-type) was observed with 1st order satellites associated with the [0 0 1] zone. Furthermore, a monoclinic distortion was observed, as indicated by splitting of the reflections in the b* direction. The monoclinicity was confirmed by dark-field images, which showed (1 0 0) twin lamellae. Diffuse streaks along <h h 0> are present in some crystals already at room temperature, but appear in others at temperatures below 365 K. Their intensities sharpen with increasing temperature, and at 630 K a 2a×2b superstructure appears. At the same temperature the monoclinic distortion and the twin lamellae disappear gradually. The new 2a×2b superstructure and Pb-type modulations coexist until the phase starts to decompose. The change of these structural modulations and twin transformations are discussed in connection with oxygen ordering within the different structural layers.

Document Type: Article
Keywords: (Bi,Pb)2223 phase In situ heating Modulated structures Twin lamellae Transmission electron microscopy
Research affiliation: Kiel University
Refereed: Yes
DOI etc.: 10.1016/j.physc.2003.06.001
ISSN: 0921-4534
Date Deposited: 02 Feb 2012 09:03
Last Modified: 28 Mar 2018 10:17
URI: http://oceanrep.geomar.de/id/eprint/16226

Actions (login required)

View Item View Item