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Manufacturing method of a perovskite-type composite oxide powder

A composite oxide, perovskite-type technology, applied in titanium compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of higher requirements, insufficient reaction between titanium oxide powder raw materials and barium hydroxide, and achieve simplification. Manufacturing process, promotion of synthesis reaction, effect of large specific surface area

Active Publication Date: 2012-07-18
MURATA MFG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Therefore, in order to make titanium oxide (TiO 2 ) and barium hydroxide (Ba(OH) 2 ) to fully react, barium hydroxide needs to diffuse into the interior of titanium oxide aggregates, but in the presence of dense aggregates of titanium oxide powder, it is difficult to diffuse barium hydroxide into the interior of titanium oxide aggregates, and as a result, there are Insufficient reaction between titanium oxide powder raw material and barium hydroxide
[0009] In addition, in recent years, multilayer ceramic capacitors have been put into practical use as products in which the thickness of the ceramic layer (element thickness) as the dielectric layer provided between the internal electrodes for capacity formation is less than 1 μm. For fine particles, c / a The demand for barium titanate powder with a relatively large axis ratio and high crystallinity is increasing, but the fact is that the technology of the above-mentioned Patent Document 1 may not be able to meet the above-mentioned demand.

Method used

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  • Manufacturing method of a perovskite-type composite oxide powder
  • Manufacturing method of a perovskite-type composite oxide powder
  • Manufacturing method of a perovskite-type composite oxide powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Prepare No.1~No.9 anatase-type titanium dioxide (TiO 2 )powder. In addition, each titanium oxide (TiO 2 ) The specific surface area of ​​the powder is a value measured by the BET method, and the pore volume is a value measured by the BJH method.

[0032] Then, each TiO of No.1 to No.9 in Table 1 2 7.40 kg of powder and 19.4 L (liter) of pure water were put into the reactor, and stirred with a mixer to prepare a slurry.

[0033] Next, the slurry is heated to 70°C (preferably 50°C or higher), and barium hydroxide (Ba(OH) 2 ), after reaching the specified Ba / Ti ratio, heating and stirring to keep the temperature above 80°C, and reacting for 1 hour to synthesize barium titanate (BaTiO 3 ), the prepared slurry was dried to obtain BaTiO 3 powder (perovskite composite oxide powder).

[0034] Then, the prepared BaTiO was analyzed by BET method 3The specific surface area of ​​the powder was measured. The results are shown in Table 1.

[0035] In addition, for the prepar...

Embodiment 2

[0044] Titanium oxide (TiO 2 ) powder (TiO of No.7 in Table 1 2 powder), calcium carbonate (CaCO 3 ) powder, barium hydroxide (Ba(OH) 2 ) each raw material of powder, so that the final composition is (Ba 0.95 Ca 0.05 )TiO 3 .

[0045] Then, the same as in Example 1, the TiO 2 Powder (TiO of No.7 of Table 1 2 powder), CaCO 3 Put the powder and pure water into the reactor, stir with a mixer and heat to 70°C, add barium hydroxide (Ba(OH) 2 ), continue to stir, and make it react for 1 hour above 80°C to obtain (Ba, Ca)TiO 3 slurry. Afterwards, the slurry was dried to obtain (Ba,Ca)TiO 3 powder.

[0046] Confirmation of obtained (Ba, Ca)TiO 3 Powder is and uses the TiO of No.7 of the table 1 of embodiment one 2 Powder production (synthesis) of BaTiO 3 have approximately the same specific surface area, composition and target (Ba 0.95 Ca 0.05 )TiO 3 Consistent fine powder ((Ba 0.095 Ca 0.05 )TiO 3 )powder.

[0047] In addition, it was confirmed that the unreacte...

Embodiment 3

[0050] Weighing TiO 2 Powder (TiO of No.7 of Table 1 2 powder), strontium carbonate (SrCO 3 ) powder, barium hydroxide (Ba(OH) 2 Each raw material of powder, so that final composition is (Ba 0.095 Sr 0.05 )TiO 3 .

[0051] Then, in the same manner as in Example 1, the TiO 2 Powder (TiO of No.7 of Table 1 2 powder), SrCO 3 Put the powder and pure water into the reactor, stir with a mixer and heat to 70°C, add barium hydroxide (Ba(OH) 2 ), continue to stir, and make it react at 80°C for 1 hour to obtain (Ba, Sr)TiO 3 slurry. Afterwards, the slurry was dried to obtain (Ba,Sr)TiO 3 powder.

[0052] Confirmed obtained (Ba,Sr)TiO 3 Powder is and uses the TiO of No.7 of the table 1 of embodiment one 2 Powder production (synthesis) of BaTiO 3 have roughly the same specific surface area, composition and target [Ba 0.95 Ca 0.05 )TiO 3 Consistent fine powder ((Ba 0.95 Sr 0.05 )TiO 3 )powder.

[0053] In addition, it was confirmed that the unreacted substance, that i...

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Abstract

The invention provides a manufacturing method of a perovskite-type composite oxide powder, which is adaptive for material of a dielectric layer in a laminated ceramic capacitor. Barium hydroxide is added to the solution of dioxide powder with pore volume more than 0.38 ml / g and specific surface area more than 250 m2 / g, perovskite-type composite oxide powder is produced. Sr and / or Ca replaces one part of Ba at A position. The perovskite-type composite oxide powder produced by the method is heat processed to increase crystalline.

Description

technical field [0001] The present invention relates to the use of general formula ABO 3 The method for producing a perovskite-type composite oxide shown in detail relates to a method for producing a barium titanate-based perovskite-type composite oxide that can be suitably used as a ceramic raw material for ceramic electronic components. Background technique [0002] As a method for economically producing perovskite-type composite oxides such as barium titanate with excellent crystallinity using fine particles, for example, a method of applying a solid-liquid reaction as described below to a perovskite-type composite oxide has been proposed ( Refer to Patent Document 1). [0003] The method involves adding hydroxides of elements constituting the A-site component, containing water of crystallization, and having a 250m 2 The mixing treatment step of mixing titanium oxide powders with a specific surface area of ​​1 / g or more, the mixing treatment step includes a solution gen...

Claims

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Application Information

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IPC IPC(8): C01G23/00C04B35/468
CPCC04B35/468H01G4/1218H01G4/30
Inventor 加藤真一
Owner MURATA MFG CO LTD
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