Formation Process of Li-added Bi-2212 Phase(II) - Formation at a Relatively Low Temperature of 730°C -

Takeyuki Kikuchi, Masashi Fujiwara, Masahiro Nagae, Yoshihiro Kusano, Makoto Nakanishi, Jun Takada

Research output: Contribution to journalArticle

Abstract

Effects of Li-addition on the formation process of Bi-2212 phase have been studied for samples with a nominal composition of Bi:Sr:Ca:Cu:Li=2:1.5:1.5:2:0.2. Samples were heated at temperatures ranging between 560°C and 730°C in air with various heating rates. The formation range of the phases formed was determined by powder X-ray diffraction method(XRD). Li-addition seems to bring two different effects on the formation process of the Bi-2212 phase: an acceleration of the formation of Bi-2201 phase on heating and early stage of holding at 730°C, and a promotion of phase transformation of Bi-2201 phase to Bi-2212 phase after holding for a few hours. Such two effects can be explained by formation of two different oxides which were newly found. The microstructures of the newly found oxides were observed by scanning electron microscopy(SEM), high-resolution transmission electron microscopy(HR-TEM) and electron diffraction(ED).

Original languageEnglish
Pages (from-to)129-134
Number of pages6
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume45
Issue number2
DOIs
Publication statusPublished - Feb 1998

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Keywords

  • Bi-2212 phase
  • Formation process
  • Li-addition
  • New oxide

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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