Systematic study on synthesis and structural, electrical transport and magnetic properties of Pb-substituted Bi-Ca-Co-O misfit-layer cobaltites

Yoshiaki Tanaka, Tatsuo Fujii, Makoto Nakanishi, Yoshihiro Kusano, Hideki Hashimoto, Yasunori Ikeda, Jun Takada

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Single-phases of Pb-substituted Bi-Ca-Co-O misfit-layer cobaltites with various Pb concentrations have been synthesized and the Pb-substitution effects on the structural, electrical and magnetic properties have been systematically investigated. Powder X-ray diffraction analysis showed that the single-phases of Bi1.8-x/2PbxCa2Co2Oz were obtained up to x = 0.6 - 0.7 under the optimized synthesis conditions. The lattice parameters of Bi1.8-x/2PbxCa2Co2Oz continuously changed with increasing Pb concentration. The electron diffraction analysis suggested that the structure consisted of two different sublattices with a rock salt structure (RS) and a hexagonal CdI2 structure (H), respectively, without modulation. In combined with the chemical composition analysis, the chemical formulas of the x = 0 and x = 0.6 samples were determined approximately as [Bi1.74Co0.31Ca2.01O4]RS[CoO2]1.69 and [Bi1.47Pb0.38Co0.29Ca1.98O4]RS[CoO2]1.71, respectively. The electrical resistivity became more metallic with increasing the Pb concentration up to x = 0.6. Moreover, the Pb-substitution simultaneously increased the antiferromagnetic Weiss temperatures and decreased the effective magnetic moments of the Co ions.

Original languageEnglish
Pages (from-to)122-126
Number of pages5
JournalSolid State Communications
Volume141
Issue number3
DOIs
Publication statusPublished - Jan 1 2007

Keywords

  • A. Misfit-later cobaltite
  • D. Hole-doping
  • D. Pb-substitution

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Systematic study on synthesis and structural, electrical transport and magnetic properties of Pb-substituted Bi-Ca-Co-O misfit-layer cobaltites'. Together they form a unique fingerprint.

  • Cite this