A layered cuprate derived from the hexagonal 4H-BaCuO2+x structure: Ba36Ca2Cu32O86-x

M. Hervieu, S. Malo, B. Raveau, C. W. Chu, X. Y. Xue, I. Rusakova

Research output: Contribution to journalArticlepeer-review


A new layered cuprate Ba36Ca2Cu32O86-x has been synthesized using high pressure technique. It crystallizes in an orthorhombic cell with a ≈ 5.7 Å, b ≈ 9.8 Å and c ≈ 45.50 Å, space group Immm (or Imm2). The high resolution electron microscopy study shows that this original structure consists of oxygen deficient 4H-hexagonal BaCuO2+x layers, interleaved with barium-calcium layers. The proposed structural model suggests for copper, a pyramidal coordination. This new phase is described as the n = 4 member of a new structural family [Ba8Cu8O20]n[Ba4Ca 2O4]. Different higher n members (n = 7, 10, 13) are observed as defects by HREM.

Original languageEnglish
Pages (from-to)275-283
Number of pages9
JournalPhysica C: Superconductivity and its applications
Issue number3-4
Publication statusPublished - 1998 Dec 20

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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