Electrochemical lithium intercalation into the Bi-2212 phase

M. Fujiwara, M. Nakanishi, Y. Kusano, T. Fujii, J. Takada, Y. Takeda, Y. Ikeda

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Effects of lithium intercalation into the Bi-2212 phase on its structural and superconducting properties were studied using monophasic samples of Bi2Sr1.5Ca1.5Cu2Oz lithiated through an electrochemical method at a constant applied voltage at room temperature. The amount of doped lithium was found by ICP analysis to be in the range of 0 ≤ y ≤ 0.37 for LiyBi2Sr1.5Ca1.5Cu2O z depending upon experimental conditions. However, the oxygen content determined by coulometric titration remained almost unchanged after the lithiation. The electrochemical lithium intercalation led to a very interesting change in Tc, though the original tetragonal structure and oxygen content remained essentially the same: Tc first increased rapidly as y increased, reached a maximum of 94 K, and then decreased to zero. The drastic Tc change is ascribed to a decrease in the hole concentration. Thus, the electrochemical lithium-doping provides us with a great advantage of easily controlling Tc at room temperature by changing electrochemical conditions while keeping the original crystal symmetry.

Original languageEnglish
Pages (from-to)219-224
Number of pages6
JournalPhysica C: Superconductivity and its applications
Volume279
Issue number3-4
DOIs
Publication statusPublished - Jun 1 1997

Keywords

  • Bi-2212 phase
  • Cu-valence
  • Electrochemical method
  • Lattice parameter
  • Lithium intercalation
  • Oxygen content
  • T

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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