A new cuprate with mercury bilayers : the "2222" oxide <script type="math/tex">Hg_{2-x}M_{x}Ba_{2}Pr_{2}Cu_{2}O_{10-\delta}</script> (M= Cu,Pr)

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

doi:10.1006/JSSC.1995.1033

Title

A new cuprate with mercury bilayers : the "2222" oxide $Hg_{2-x}M_{x}Ba_{2}Pr_{2}Cu_{2}O_{10-\delta}$ (M= Cu,Pr)

Author

Huve, M.

Martin, C.

Maignan, A.

Michel, C.

Van Tendeloo, G.

Hervieu, M.

Raveau, B.

Abstract

A ''2222'' cuprate with mercury bilayers (Hg1.5Cu0.2Pr0.3)Ba2Pr2Cu2O10-delta, has been synthesized for the first time. It crystallizes in the P4/nmm space group with a = 3.9072(1) Angstrom and c = 17.219(1) Angstrom. The powder XRD and HREM studies of this new cuprate show that its structure consists of an intergrowth of double pyramidal (oxygen-deficient perovskite) copper layers, with double fluorite-type layers and distorted triple rock salt layers (mercury bilayers). The structure of this phase can be deduced from that of the ''2212'' mercury cuprate (Hg1.5Cu0.2Pr0.3)Ba2PrCu2O8-delta by the introduction of one additional [PrO2]infinity fluorite layer. The regular stacking of the metallic layer and the uniform cationic distribution in the mercury bilayers are remarkable features of this cuprate. The stabilization of the mercury bilayers by praseodymium and the absence of superconductivity are discussed. (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.1995.1033

Volume/pages

114 :1 (1995) , p. 230-235