The Effects of Substitution of Alkaline Earths or Y for La on Structure and Electrical Properties of LaSrFeO4

Shinobu Fujihara, Toshiyuki Nakata, Hiromitsu Kozuka, Toshinobu Yoko

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The effects of the substitution of alkaline earths or Y for La on the structure and electrical properties of LaSrFeO4 with K2NiF4 structure have been investigated. EDTA titration confirmed that Fe3+ was oxidized to Fe4+ in an amount corresponding to that of divalent alkaline earth ions substituted for La3+. The change in the lattice constants was interpreted in terms of the ionic radius of the substituted ions and the Jahn-Teller distortion of the Fe(IV)O6 octahedra having d4 electronic configuration. All the substituted LaSrFeO4 samples were semiconducting over the temperature range from 100 to 300 K. The measurement of the Seebeck coefficient revealed that the conduction carriers of LaSrFeO4 were holes and the carrier concentration increased with increasing amount of Fe4+. La1-xAxSrFeO4 exhibited a monotonic decrease in resistivity and activation energy for conduction with increasing Fe4+ abundance. The activation energy for conduction did not change by changing the lattice constant where the Fe4+ abundance did not change with various substituents.

Original languageEnglish
Pages (from-to)456-463
Number of pages8
JournalJournal of Solid State Chemistry
Volume115
Issue number2
DOIs
Publication statusPublished - 1995 Mar
Externally publishedYes

Fingerprint

Lattice constants
Electric properties
Substitution reactions
Activation energy
Earth (planet)
electrical properties
Ions
substitutes
conduction
Jahn-Teller effect
Seebeck coefficient
Ethylenediaminetetraacetic acid
Titration
Edetic Acid
activation energy
Carrier concentration
ethylenediaminetetraacetic acids
Seebeck effect
titration
ions

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Materials Chemistry
  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

Cite this

The Effects of Substitution of Alkaline Earths or Y for La on Structure and Electrical Properties of LaSrFeO4. / Fujihara, Shinobu; Nakata, Toshiyuki; Kozuka, Hiromitsu; Yoko, Toshinobu.

In: Journal of Solid State Chemistry, Vol. 115, No. 2, 03.1995, p. 456-463.

Research output: Contribution to journalArticle

Fujihara, Shinobu ; Nakata, Toshiyuki ; Kozuka, Hiromitsu ; Yoko, Toshinobu. / The Effects of Substitution of Alkaline Earths or Y for La on Structure and Electrical Properties of LaSrFeO4. In: Journal of Solid State Chemistry. 1995 ; Vol. 115, No. 2. pp. 456-463.
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