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

doi:10.1016/S0921-4534(98)00582-6

A layered cuprate derived from the hexagonal 4H-BaCuO_2+x structure: Ba₃₆Ca₂Cu₃₂O_86-x

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

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Abstract

A new layered cuprate Ba₃₆Ca₂Cu₃₂O_86-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 BaCuO_2+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 language	English
Pages (from-to)	275-283
Number of pages	9
Journal	Physica C: Superconductivity and its applications
Volume	309
Issue number	3-4
DOIs	https://doi.org/10.1016/S0921-4534(98)00582-6
Publication status	Published - 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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10.1016/S0921-4534(98)00582-6

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

abstract = "A new layered cuprate Ba36Ca2Cu32O86-x has been synthesized using high pressure technique. It crystallizes in an orthorhombic cell with a ≈ 5.7 {\AA}, b ≈ 9.8 {\AA} and c ≈ 45.50 {\AA}, 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.",

author = "M. Hervieu and S. Malo and B. Raveau and Chu, {C. W.} and Xue, {X. Y.} and I. Rusakova",

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T1 - A layered cuprate derived from the hexagonal 4H-BaCuO2+x structure

T2 - Ba36Ca2Cu32O86-x

AU - Hervieu, M.

AU - Malo, S.

AU - Raveau, B.

AU - Chu, C. W.

AU - Xue, X. Y.

AU - Rusakova, I.

PY - 1998/12/20

Y1 - 1998/12/20

N2 - 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.

AB - 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.

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A layered cuprate derived from the hexagonal 4H-BaCuO_2+x structure: Ba₃₆Ca₂Cu₃₂O_86-x

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