New quadruple perovskites Ln2Ba2TixSn2-x Cu2O11, (0≤x≤2): controlling copper-oxygen distances in potential superconducting parent phases

Anne Gormezano, Mark T. Weller

Research output: Contribution to journalArticlepeer-review

Abstract

The compounds NdBaCuSnTiO, SmBaCuSnTi O and GdBaCu TiO have been synthesized by reaction of the component oxides at 1025°C and their structures refined from powder X-ray diffraction data. The materials crystallise with a quadrupled perovskite unit cell, similar to that of LaBaCuSn O containing alternating double layers of copper and titanium/tin. Decreasing lanthanide size and increasing titanium content is associated with a marked unit cell contraction and a reduction in the mismatch between the different double-layer dimensions. A reduction in the copper-oxygen distances in the CuO planes from 2.007 Å in La BaCuSnO to 1.951 Å in GdBaCuTiO produces a copper-oxygen interaction similar to that found in high-temperature superconductors.
Original languageEnglish
Pages (from-to)979-982
JournalJournal of Materials Chemistry
Volume3
Issue number9
DOIs
Publication statusPublished - 1993

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