Synthesis of La1-xSrxCoO3 (x≤0.2) at Low Temperature from PVA-polymeric Gel Precursors

Ho Jin Kweon, Dong Gon Park, Seung Taik Kuk, Hyu Bum Park, Keon Kim

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Abstract

Single phase La1-xSrxCoO3 (x≤0.2) was synthesized as a uniform sized 100 nm particulates with relatively high surface area of 20-30 m2/g, at low temperature (≥600°C), from a polymeric gel precursors prepared by using poly(vinyl alcohol) as homogenizer. No minor phase developed during the crystallization when polymer/metal mole ratio was higher than 3. As the polymer/metal mole ratio was raised in the gel, the amount of carbonaceous residues in the amorphous solid precursor prepared by heating the gel at 300°C increased. Most of the residues were eliminated by exothermic thermal decomposition around 400°C. The amount of residual carbon (less than 1%) left in the crystalline La1-xSrxCoO3 decreased as more polymer was used, eliminating detrimental effect which might be posed by using large amount of organic homogenizer. The crystal structure of La1-xSrxCoO3 synthesized at temperature lower than 800°C was observed to be shifted from rhombohedral to more symmetric cubic. The structure shifted back to rhombohedral as the cubic sample was annealed at 1000°C.

Original languageEnglish
Pages (from-to)1249-1256
Number of pages8
JournalBulletin of the Korean Chemical Society
Volume18
Issue number12
Publication statusPublished - 1997 Dec 1

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Polymers
Gels
Metals
Crystallization
Temperature
Pyrolysis
Carbon
Crystal structure
Alcohols
Crystalline materials
Heating

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Synthesis of La1-xSrxCoO3 (x≤0.2) at Low Temperature from PVA-polymeric Gel Precursors. / Kweon, Ho Jin; Park, Dong Gon; Kuk, Seung Taik; Park, Hyu Bum; Kim, Keon.

In: Bulletin of the Korean Chemical Society, Vol. 18, No. 12, 01.12.1997, p. 1249-1256.

Research output: Contribution to journalArticle

Kweon, Ho Jin ; Park, Dong Gon ; Kuk, Seung Taik ; Park, Hyu Bum ; Kim, Keon. / Synthesis of La1-xSrxCoO3 (x≤0.2) at Low Temperature from PVA-polymeric Gel Precursors. In: Bulletin of the Korean Chemical Society. 1997 ; Vol. 18, No. 12. pp. 1249-1256.
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