Electron microscopy on YPd5B3Cx, x=0 or 0.35

H. W. Zandbergen, W. G. Sloof, R. J. Cava, J. J. Krajewski, W. F. Peck

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28 Scopus citations

Abstract

Superconducting and non-superconducting specimens of YPd5B3Cx with x=0 and 0.35 have been studied with EPMA, electron diffraction, EDX element analysis and HREM. The superconducting specimen YPd5B3C0.35 (superconducting fraction 10-20%) contains six different phases, of which four are crystalline with the approximate compositions: (1) YPd2BC, I-centred tetragonal, a=0.375, c=1.07 nm, (2) YPd1.2B3.3, cubic, a=0.42 nm, with an incommensurate superstructure (q=0.285 (a*+b*+c*)), (3) YPd8B3, I-centred orthorhombic, a=0.84, b=0.90, c=1.67 nm, and (4) YB 4-xCx tetragonal, a=0.72, c=0.41 nm. In the specimen YPd5B3 (superconducting fraction 0.2%) only the phases YPd1.2B3.3 and YB4-xCx are observed in equal and higher amounts, respectively. The non-superconducting specimen YPd5B3C0.35, obtained by annealing the superconducting specimen at 800°C, contains about five phases. In this specimen the phases YPd2BC and YPd1.2B3.3 were distinctly decomposed. Because of its presence and absence in the various specimens and its plate-like morphology YPd2BC is suggested to be the superconducting phase with a layer sequence {B0.5-Pd2-B0.5-YC}n. Considerations on the formation and stability of YPd2BC are given.

Original languageEnglish (US)
Pages (from-to)365-376
Number of pages12
JournalPhysica C: Superconductivity and its applications
Volume226
Issue number3-4
DOIs
StatePublished - Jun 10 1994

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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