Process for preparing compound metal oxides of yttrium, barium a

Details Process for preparing compound metal oxides of yttrium, barium a Process for preparing compound metal oxides of yttrium, barium a

1989-11-03

1990-09-11

Dean, R.

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

423593, 423263, 423265, 423337, 423604, 423636, 423639, 502252, 502355, 501 94, 501123, 501126, 501152, 505735, 505737, 505738, 505780, 252 51, 252521, C01F 1102, C01F 1700, C01G 302

Patent

active

049563408

ABSTRACT:
A process for preparing compound metal oxides, superconductive compound oxides, is disclosed. The process comprises preparing an aqueous solution containing a predetermined content ratio of chloride, nitrate or acetate of a rare earth metal, an alkaline earth metal and copper, said content ration corresponding to the composition of the object compound metal oxide, adjusting the pH of the solution to 1.5-2.0, adding oxalic acid in an amount such that the concentration of the residual oxalic acid becomes 0.05 M/l-0.1 M/l, collecting the thus formed precipitate and firing it.

REFERENCES:
patent: 4886777 (1989-12-01), Kimura et al.
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Proceeding of Symposium S of the 1987 Spring Meeting of Mat. Res. Soc., vol. EA-11, Morris et al, "Mobile Oxygen and Isotope Effects in the High Temperature Superconductive YBa.sub.2 Cu.sub.3 O.sub.7 ".
"Manufacture and Testing of High Tc-Super Conducting Materials", Yarat et al, Advanced Ceramic Materials, vol. 2, No. 3B, 1987, pp. 372-379.
Advanced Ceramic Materials, vol. 2, No. 3B, 1987, Cina et al, "Powder Processing for Microstructural Control in Ceramic Superconductors", pp. 329-336.
Advanced Ceramic Materials, vol. 2, No. 3B, 1987, pp. 656-661, "Thermal Analysis of Ba.sub.2 YCu.sub.3 O.sub.7-x at 700.degree.-1000.degree. C. in Air", Cook et al.
Mat. Res. Soc. Symp. Proc., vol 99, 1988, "Advantages of Barium Peroxide in the Powder Synthesis of Perovskite Super Conductors", pp. 615-618, Hepp et al.
Japanese Journal of Applied Physics, vol. 26, No. 5, 1987, pp. 1736-1737, Kawai et al, "Preparation of High-Tc Y--Ba--Cu--O Superconductor".
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Z. Phys. B. Condensed Matter 64, 189-193, 1986, Bednorz et al, "Possible High Tc Superconductivity in the Ba--La--Cu--O System."
Materials Research Society Symposium Proceedings, vol. 99, High Temperature Superconductors, Kayser et al., "Preparation of High Tc YBa.sub.2 Cu.sub.3 O.sub.7-x Powders from Nitrate and Oxalate Precursors", 1988, pp. 159-164.
Materials Research Society Symposium Proceedings, vol. 99, High Temperature Superconductors, Voigt et al., "A Hydroxycarbonate Route to Superconductor Precursor Powders", 1988, pp. 635-638.
Japanese Journal of Applied Physics, vol. 26, No. 5, May 1987, "Single Crystal preparation of Ba.sub.2 YCu.sub.3 O.sub.x from NonStoichiometric Melts", Takekaw et al., L851-853.
Japanese Journal of Applied Physics, vol. 26, No. 4, Apr. 1987, pp. L498-501, "X-Ray and Electron Microscopic Study of a High Temperature Super Conductor, etc."
Chemistry of High-Temperature Super Conductors, Chapter 7, Davison et al; and Chapter 11, Holland et al., American Chemical Society, 1987, pp. 65-78 and 102-113.
Japanese Journal of Applied Physics, vol. 26, No. 5, May 1987, pp. L858-859.
Materials and Processing Report, "Update Report on High Tc Superconductors", vol. 2, No. 4, Jul. 1987, pp. 1-4.

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