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1996 Fiscal Year Final Research Report Summary

Preparation of Y-Ba-Cu complex oxide powder from suspension by using supercritical carbon dioxide

Research Project

Project/Area Number 07650905
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 化学工学一般
Research InstitutionDoshisha University

Principal Investigator

TACHIWAKI Tokumatsu  Doshisha University, Faculty of Engineering, 工学部, 教授 (00066250)

Project Period (FY) 1995 – 1996
KeywordsHIGH TEMPERATURE SUPERCONDUCTING OXIDE / YBCO HIGH TEMPERATURE SUPERCONDUCTOR / SUPERCRITICAL FLUID DRYING / SUPERCRITICAL STATE / FREEZE-DRYING / ALKOXIDE METHOD
Research Abstract

In the first place, I synthesized yttrium triisopropoxide , barium diisopropoxide and copper diisopropoxide from anhydrous yttrium chloride, metal barium and anhydrous copper chloride, respectively. Next, stoichimetiric solution for hydrolysis was prepared by dissolving yttrium triisopropoxide, barium diisopropoxide, copper diisopropoxide in 2-propanol in order to obtain complex oxide. After the mixed alkoxide solution was hydrolized by water. Thus, the suspension of complex oxide was obtained. The experimental results of freeze-drying of the suspension was published in Applied Surface Science, Vol.100/101, in 1996.
After the experimental apparatus of supercritical carbon dioxide drying was set, solubilities of both 2-propanol and water in 50-140 atm and at 30-50゚C were measured. Then, phase equilibrium for CO_2-2-propanol-water system were examined experimentally and theretically. Then, the drying of the suspension was performed in the suitable conditions. The diameter of dried powders were 0.025-0.25mum. The results from this experiment suggest that supercritical drying method is useful for drying of the suspension prepared by alkoxide route.
A part of the results of this study was presented st 46th Canadian Chemical Engineering Conference in Kingston, and 29th Autumn Meeting of Chemical Engineering of Japan in September in 1996.
This paper is now preparing.

  • Research Products

    (2 results)

All Other

All Publications (2 results)

  • [Publications] A. Tachiwaki et al.: "Charactenzation of Freeze-Dried Powders Prepared by Alkoxide Route for YBCO Superconductors" Applied Surface Science. 100/101. 272-276 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Tachiwaki, T.Sugimoto, T.Ito, A.Hiraki: "Caracterization of freeze-dried powders prepared by alkoxide route for YBCO superconductor" Applied Surface Science. 100/101. 272-276 (1996)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-09  

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