## Abstract

Samples of the [Hg_{1 - x}C_{x}]-Ba_{2}CuOy system [(Hg,C)-1201] with stoichiometries within the range 0.00≤x≤1.00 were synthesized by a highpressure, high-temperature technique. The sample with x = 0.00 [HgBa_{2}CuO_{4+δ}] was non-superconducting with lattice parameters a = 3.8676(2) Å, c = 9.470(1) Å. At low ranges of substitution (0.10≤x≤0.30), the predominant phase was found to be Hg-1201 with identical lattice parameters to those found for x = 0.00. At x = 0.40 the Hg-1201 phase coexists in similar proportions with the phase of mixed [Hg_{1 - x},C_{x}]-1201 stoichiometry. At x = 0.50, this second phase with lattice parameters a = 3.9271(3) Å, c = 8.676(2) Å is predominant and only traces of the Hg-1201 phase were found. At x = 0.75 the [Hg_{1 - x},C_{x}]-1201 phase found for x = 0.50 coexists with the CO_{3}Ba_{2}CuO_{y} phase, which is the extreme of the substitution range. This latter was predominant at x = 1.00 with lattice parameters a = 4.0044(3) Å, c = 7.909(1) Å, but at higher pressure than the previous substitutions. This system is constituted of three main phases, HgBa_{2}CuO_{4 + δ}, Hg_{1 - x}C_{x}Ba_{2}CuO_{y} (x ≈ 0.50) and CO_{3}Ba_{2}CuO_{y}, which appear in different proportions according to the percentage of substitution and the applied synthesis pressure.

Original language | English |
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Pages (from-to) | 1463-1470 |

Number of pages | 8 |

Journal | Materials Research Bulletin |

Volume | 30 |

Issue number | 12 |

DOIs | |

Publication status | Published - Dec 1995 |

Externally published | Yes |

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