Superiority of nitrate decomposition method for synthesis of K2NiF4-type LaxSr2-xMnO4 catalysts

R. Karita, H. Kusaba, K. Sasaki, Y. Teraoka

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

K2NiF4-type La0.2Sr1.8MnO4 was synthesized by nitrate (ND) and nitrate/acetate (NAD) decomposition methods as well as solid-state reaction. Single-phase oxide was obtained at 550 °C by the ND method just after the decomposition of Sr(NO3)2 and at 1000 °C by the NAD method after the decomposition of SrCO3. The K2NiF4-type oxide was hardly formed by the solid-state reaction. In the La-Sr-Mn system, an intermediate compound of SrCO3, if present or formed during the decomposition process, interfered with the low-temperature formation of the K2NiF4-type oxide because of its high decomposition temperature about 1000 °C. The ND method used only metal nitrates and no starting materials with carbon source, so that the low-temperature synthesis of the K2NiF4-type oxide was realized without forming obstinate intermediate compound of SrCO3. The low-temperature synthesis was possible for LaxSr2-xMnO4 with the substitution of La (0 < x < 0.5) and not for La0.2A1.8MnO4 (A = Ca and Ba). The effect of A-site cations on the K2NiF4-phase formation was discussed from the geometric aspect.

Original languageEnglish
Pages (from-to)471-475
Number of pages5
JournalCatalysis Today
Volume126
Issue number3-4 SPEC. ISS.
DOIs
Publication statusPublished - Aug 30 2007

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Nitrates
Oxides
Decomposition
Catalysts
Solid state reactions
NAD
Temperature
Cations
Acetates
Substitution reactions
Carbon
Positive ions
Metals

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

Cite this

Superiority of nitrate decomposition method for synthesis of K2NiF4-type LaxSr2-xMnO4 catalysts. / Karita, R.; Kusaba, H.; Sasaki, K.; Teraoka, Y.

In: Catalysis Today, Vol. 126, No. 3-4 SPEC. ISS., 30.08.2007, p. 471-475.

Research output: Contribution to journalArticle

Karita, R. ; Kusaba, H. ; Sasaki, K. ; Teraoka, Y. / Superiority of nitrate decomposition method for synthesis of K2NiF4-type LaxSr2-xMnO4 catalysts. In: Catalysis Today. 2007 ; Vol. 126, No. 3-4 SPEC. ISS. pp. 471-475.
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AB - K2NiF4-type La0.2Sr1.8MnO4 was synthesized by nitrate (ND) and nitrate/acetate (NAD) decomposition methods as well as solid-state reaction. Single-phase oxide was obtained at 550 °C by the ND method just after the decomposition of Sr(NO3)2 and at 1000 °C by the NAD method after the decomposition of SrCO3. The K2NiF4-type oxide was hardly formed by the solid-state reaction. In the La-Sr-Mn system, an intermediate compound of SrCO3, if present or formed during the decomposition process, interfered with the low-temperature formation of the K2NiF4-type oxide because of its high decomposition temperature about 1000 °C. The ND method used only metal nitrates and no starting materials with carbon source, so that the low-temperature synthesis of the K2NiF4-type oxide was realized without forming obstinate intermediate compound of SrCO3. The low-temperature synthesis was possible for LaxSr2-xMnO4 with the substitution of La (0 < x < 0.5) and not for La0.2A1.8MnO4 (A = Ca and Ba). The effect of A-site cations on the K2NiF4-phase formation was discussed from the geometric aspect.

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