Synthesis of HgBa2Ca3Cu4Oy under ambient pressure

R. Usami, S. Adachi, M. Itoh, T. Tatsuki, A. Tokiwa-Yamamoto, K. Tanabe

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16 Citations (Scopus)

Abstract

The mercury-based oxide superconductor, HgBa2Ca3Cu4Oy phases was synthesized by a controlled vapor/solid reaction technique using high-purity powders of HgO, BaO, CaO and CuO as starting materials. Two types of bars, with different cation ratios of Hg:Ba:Ca:Cu=0:2:2:3 and 1:2:2:3, were heated in an evacuated quartz tube. The resulting HgBa2Ca3Cu4Oy sample had a Tc of 123 K and lattice parameters a=3.852(2) Å and c=19.01(4) Å with a volume fraction of 83% of the total shielding signal. The formation condition was widely investigated, showing that the higher heating temperature and longer heating time lead to the formation of the HgBa2CanCun-1Oy phase with a higher number n of Cu-O2 planes in a unit cell.

Original languageEnglish
Pages (from-to)21-26
Number of pages6
JournalPhysica C: Superconductivity and its applications
Volume262
Issue number1-2
DOIs
Publication statusPublished - 1996 May 10
Externally publishedYes

ASJC Scopus subject areas

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

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