Synthesis and electrical properties of Ce0.25Sr1.75(Ni1-yMy)O4-δ (M = Fe, Co) (0 ≤ y ≤ 0.3)

Kouta Iwasaki, Hiroyuki Tanaka, Shunichi Kubota, Hisanori Yamane, Masahiko Shimada

Research output: Contribution to journalArticlepeer-review

Abstract

Solid solutions of Ce0.25Sr1.75(Ni1-yMy)O4-δ (M = Fe or Co, 0 ≤ y ≤ 0.3), having tetragonal K2NiF4-type structure, were synthesized at 1100°C under flowing O2. The a and c-axis lengths of Ce0.25Sr1.75(Ni1-yMy)O4-δ (a = 3.7999(1), c = 12.3760(2) Å for Ce0.25Sr1.75NiO3.75 (y = 0; CeSr7Ni4O15)) increased with increasing y (a = 3.8108(1), c = 12.4268(4) Å for Ce0.25Sr1.75Ni0.7Fe0.3 O4-δ). Decrease of the a-axis length to 3.7975(1) Å and increase of the c-axis length to 12.4302(2) Å were observed by the substitution of Co to the composition of Ce0.25Sr1.75Ni0.7Co0.3 O4-δ. Samples for characterization of the electrical properties were sintered at 1350°C and annealed at 1100°C under flowing O2. The lowest electrical resistivity (1.7 - 3.1 × 10-2 Ωcm at 20 - 800°C) among the solid solutions was measured for Ce0.25Sr1.75(Ni0.7 Fe0.3)O4-δ. Seebeck coefficients of the solid solutions ranged from -22 to -38μVK-1 around 450 - 500°C. The absolute values of the Seebeck coefficients decreased above or below this temperature.

Original languageEnglish
Pages (from-to)922-926
Number of pages5
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume48
Issue number10
DOIs
Publication statusPublished - 2001 Oct

Keywords

  • Cerium strontium nickel oxide
  • Electrical resistivity
  • KNiF type structure
  • Partial substitution
  • Solid solution

ASJC Scopus subject areas

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

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