La-substitution effects on transport properties of APbO3-δ (A = Ba, Sr and Ca)

Ayako Yamamoto, T. Ono, T. Tatsuki, T. Tamura, S. Tajima

Research output: Contribution to journalArticle

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Abstract

Partial substitutions of La for alkaline-earth elements of perovskite-type APbO3-δ (A = Ba, Sr, and Ca) were studied in order to examine carrier doping effects on the APbO3-δ system. The solubility limit of La was found to be about 10% for every alkaline-earth element. The temperature dependencies of electrical resistivity and the Seebeck coefficient for A0.9La0.1PbO3-δ samples indicated that they were metallic conductors, irrespective of the ionic size of the alkaline-earth elements. This is in good contrast with the resistivity of APbO3-δ, which is strongly influenced by the ionic size of A, via the distortion of PbO6 octahedra. The Seebeck coefficients for the A1-xLaxPbO3-δ (x = 0 and 0.1) samples were negative, and absolute values were reduced by the La substitution, which implies that electron carriers were introduced into the conduction band. Superconductivity was not observed in these compounds down to 1.8 K, although the carrier density expected, based on the Seebeck coefficient, was comparable to the value for the superconducting BaPb1-xBixO3.

Original languageEnglish
Pages (from-to)1935-1942
Number of pages8
JournalMaterials Research Bulletin
Volume34
Issue number12
DOIs
Publication statusPublished - 1999 Sep
Externally publishedYes

Fingerprint

Seebeck coefficient
Seebeck effect
Transport properties
Substitution reactions
transport properties
Earth (planet)
substitutes
electrical resistivity
Superconductivity
Conduction bands
Perovskite
Carrier concentration
conduction bands
superconductivity
solubility
conductors
Solubility
Doping (additives)
Electrons
electrons

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

La-substitution effects on transport properties of APbO3-δ (A = Ba, Sr and Ca). / Yamamoto, Ayako; Ono, T.; Tatsuki, T.; Tamura, T.; Tajima, S.

In: Materials Research Bulletin, Vol. 34, No. 12, 09.1999, p. 1935-1942.

Research output: Contribution to journalArticle

Yamamoto, Ayako ; Ono, T. ; Tatsuki, T. ; Tamura, T. ; Tajima, S. / La-substitution effects on transport properties of APbO3-δ (A = Ba, Sr and Ca). In: Materials Research Bulletin. 1999 ; Vol. 34, No. 12. pp. 1935-1942.
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AB - Partial substitutions of La for alkaline-earth elements of perovskite-type APbO3-δ (A = Ba, Sr, and Ca) were studied in order to examine carrier doping effects on the APbO3-δ system. The solubility limit of La was found to be about 10% for every alkaline-earth element. The temperature dependencies of electrical resistivity and the Seebeck coefficient for A0.9La0.1PbO3-δ samples indicated that they were metallic conductors, irrespective of the ionic size of the alkaline-earth elements. This is in good contrast with the resistivity of APbO3-δ, which is strongly influenced by the ionic size of A, via the distortion of PbO6 octahedra. The Seebeck coefficients for the A1-xLaxPbO3-δ (x = 0 and 0.1) samples were negative, and absolute values were reduced by the La substitution, which implies that electron carriers were introduced into the conduction band. Superconductivity was not observed in these compounds down to 1.8 K, although the carrier density expected, based on the Seebeck coefficient, was comparable to the value for the superconducting BaPb1-xBixO3.

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