Synthesis and characterization of mercury based "1222" cuprates <script type="math/tex">(Hg_{1-x}M_{x})(Sr,Ba)_{2}Pr_{2}Cu_{2}O_{9-\delta}</script> (M = Pr, Pb, Bi, Tl)

Hervieu, M.; Van Tendeloo, G.; Michel, C.; Martin, C.; Maignan, A.; Raveau, B.

doi:10.1006/JSSC.1995.1169

Title

Synthesis and characterization of mercury based "1222" cuprates $(Hg_{1-x}M_{x})(Sr,Ba)_{2}Pr_{2}Cu_{2}O_{9-\delta}$ (M = Pr, Pb, Bi, Tl)

Author

Hervieu, M.

Van Tendeloo, G.

Michel, C.

Martin, C.

Maignan, A.

Raveau, B.

Abstract

Five new layered cuprates, with a 1222-type structure, have been synthesized according to the formula (Hg(1-x)M(x))(Sr,Ba)(2) Pr2Cu2O9-delta with M = Pr, Pb, Pi, and Tl. They crystallize in a tetragonal cell with a approximate to a(p) and c approximate to 29.5 Angstrom; their structure consists in a triple intergrowth of oxygen-deficient perovskite, rock-salt-and fluorite-type layers. They are characterized by a mixed [Hg(1-x)M(x)O(1-delta)] layer in the rock-sail-type slice. The ED and HREM studies show that Tl, Bi, and Pb are statistically distributed in the mixed [Hg(1-x)M(x)O(1-delta)] layer, contrary to Pr which involves an ordering phenomenon along a. Different stacking defects are observed and discussed as well as the cleavage mode of the crystals. (C) 1995 Academic Press, Inc.

Language

English

Source (journal)

Journal of solid state chemistry. - London

Publication

London : 1995

ISSN

0022-4596

DOI

10.1006/JSSC.1995.1169

Volume/pages

115 (1995) , p. 525-531