Chemistry of inorganic compounds – Oxygen or compound thereof – Metal containing
Patent
1976-06-03
1977-09-20
Carter, Herbert T.
Chemistry of inorganic compounds
Oxygen or compound thereof
Metal containing
252471, 429224, 429 40, C01G 4512
Patent
active
040497909
ABSTRACT:
A new low temperature layered manganese compound of the formula Ca.sub.2 Mn.sub.3 O.sub.8 has unexpectedly been synthesized in pure form. The unit cell dimensions of this new compound have been determined by X-ray diffraction and reveal that the compound is monoclinic with lattice parameters of a=11.02 A, b=5.85 A, c=4.94 A, .alpha.=90.degree., .beta.=109.80.degree., .gamma.=90.degree.. The structure consists of pseudohexagonal Mn.sup.4+ sheets with similar oxygen sheets on either side, giving a distorted octahedral coordination to the Mn.sup.4+. Every fourth Mn.sup.4+ is missing in these layers, so their composition is Mn.sub.3 O.sub.8 with chains of coordination octahedra linked by common edges (rutile type arrangement). The Ca ions are situated between the Mn.sub.3 O.sub.8 layers.
This new Ca.sub.2 Mn.sub.3 O.sub.8 compound is prepared in pure form by means of the solid solution precursor technique whereby solid solution, mixed metal carbonates of the desired metals (Ca and Mn) having the calcite structure are precipitated from mixtures of the solutions of the salts of calcium and manganese, said salts being selected from the group consisting of carbonates, nitrates, sulfates, oxalates, acetates, precipitation being the result of the addition of a source of carbonate ions, such as ammonium carbonate, sodium carbonate, potassium carbonate of CO.sub.2, so as to achieve mixing on the atomic scale. The resulting solid solution mixed metal carbonate is subsequently calcined, preferably at a temperature of from between 600.degree.-875.degree.C to the mixed metal oxide in the pure form possessing high surface area (on the order of 20-50 m.sup.2 /g). This new material has uses as a battery cathode.
REFERENCES:
patent: 2703354 (1955-03-01), Wainer
Oswald et al.(1) "Nature", vol. 207, July 3, 1965, p. 72.
Oswald et al. (2), "Helv. Chemica Acta", vol. 50, 1967, pp. 2023-2034.
MacChesney et al."Physical Review", vol. 164, Dec. 1967, pp. 779-785.
Mellor, "Inorganic & Theoretical Chemistry", vol. 12, Longmans, Green & Co., N.Y., 1932, pp. 277-278.
Hoffman, "Lexikon der Anorganischen Verbindungen", vol. 2, 1912-1914, p. 100.
Horowitz Harold S.
Longo John M.
Allocca Joseph J.
Carter Herbert T.
Exxon Research & Engineering Co.
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