Method for preparing barium titanate powder by oxalate synthesis
First Claim
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1. A method for preparing barium titanate by oxalate synthesis, comprising the steps of:
- adding an aqueous barium chloride solution and an aqueous titanium chloride solution to an aqueous oxalic acid solution to give barium titanyl oxalate as a precipitate, aging, washing, filtering and drying the precipitate;
primary calcination of the barium titanyl oxalate, followed by primary pulverization to form fine barium titanyl powder; and
secondary calcination of the fine barium titanyl powder, followed by secondary pulverization.
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Abstract
Disclosed is a method for preparing barium titanate powder by oxalate synthesis, whereby barium titanate powder or doped barium titanate powder with excellent powder properties can be produced at high efficiency and with economic benefit. An aqueous solution containing barium chloride and titanium chloride or further containing at least one dopant serving as a donor or acceptor is mixed with an aqueous oxalic acid solution to afford barium titanyl oxalate (BTO) or doped-BTO as a precipitate which is then aged, washed, and dried, followed by primary calcination and pulverization and secondary calcination and pulverization.
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14 Claims
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1. A method for preparing barium titanate by oxalate synthesis, comprising the steps of:
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adding an aqueous barium chloride solution and an aqueous titanium chloride solution to an aqueous oxalic acid solution to give barium titanyl oxalate as a precipitate, aging, washing, filtering and drying the precipitate;
primary calcination of the barium titanyl oxalate, followed by primary pulverization to form fine barium titanyl powder; and
secondary calcination of the fine barium titanyl powder, followed by secondary pulverization. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for preparing barium titanate by oxalate synthesis, comprising the steps of:
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dissolving at least one donor or acceptor in a mixture of an aqueous barium chloride solution and an aqueous titanium chloride solution to give a dopant element-containing solution, said donor or acceptor being in a form of oxides, hydroxides, carbonates, nitrides, sulfates or salts, and being selected from the group consisting of Y, La, V, Nb, Ta, Cr, Mo, W, Mn, Fe, Co, Rh, Ni, Cu, Zn, Ga and rare-earth elements;
adding the dopant element-containing solution to an aqueous oxalic acid solution to give doped-barium titanyl oxalate as a precipitate, aging, washing, filtering and drying the precipitate;
primary calcination of the doped-barium titanyl oxalate, followed by primary pulverization to form fine doped-barium titanyl powder; and
secondary calcination of the doped-fine barium titanyl powder, followed by secondary pulverization. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification