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Method for producing bismuth iron oxide

A bismuth-iron oxide and manufacturing method technology, applied in iron compounds, chemical instruments and methods, iron oxide/iron hydroxide, etc., can solve problems such as easy generation of impurities, less high-purity substances, and difficulty in manufacturing impurity content

Active Publication Date: 2019-07-05
NIPPON CHECMICAL IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, it is known that BiFeO 3 The volatility of Bi is high, so Bi volatilizes during firing, the composition changes and impurities are easily formed, and it is difficult to produce high-purity substances with low impurity content.

Method used

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  • Method for producing bismuth iron oxide
  • Method for producing bismuth iron oxide
  • Method for producing bismuth iron oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Add it to a nylon tank with a volume of 700mL ZrO 2 Ball making, weighing and adding 37.1g of bismuth subcarbonate (produced by Nippon Chemical Industry Co., Ltd.), 13.1g of ferric (III) hydroxide (TitanKogyo, Ltd. production), then, add pure water 120g, dispersant (Sannuo Puke Co., Ltd. produced SN5468) 2.0g, and defoamer (SNDEFOAMER produced by San Nopco Co., Ltd.) 0.4g. Next, the nylon tank was sealed, and wet pulverization and mixing were performed at a rotational speed of 120 rpm for 96 hours. Next, the obtained slurry was transferred to a tray, and dried at 120° C. for 24 hours to obtain a raw material pulverized mixed powder. The specific surface area of ​​the raw material crushed and mixed powder is 18.03m 2 / g. In addition, the molar ratio (Bi / Fe) of bismuth to iron was 1.002.

[0065] Next, the raw material pulverized mixed powder was fired at 550° C. in the air atmosphere for 7 hours to obtain a fired product. The obtained fired product was observed by...

Embodiment 2

[0067] Except having set the firing temperature to 600° C., it was carried out in the same manner as in Example 1. The SEM image of the obtained fired product is shown in figure 2 . In addition, the obtained fired product was analyzed. The analysis results are shown in Table 1. Further XRD analysis was carried out. The characteristics are shown in Table 2. In addition, the X-ray diffraction pattern is shown in figure 2 .

Embodiment 3

[0069] Add it to a nylon tank with a volume of 700mL ZrO 2 Ball making, weighing and adding 37.0 g of bismuth subcarbonate (produced by Nippon Chemical Industry Co., Ltd.), 11.5 g of iron oxide (III) (produced by Kanto Chemical Co., Ltd.), and then, adding 120 g of pure water, dispersant (San Nopco Co., Ltd. produces SN5468) 2.0g, and defoamer (SNDEFOAMER produced by San Nopco Co., Ltd.) 0.4g. Next, the nylon tank was sealed, and wet pulverization and mixing were performed at a rotational speed of 120 rpm for 96 hours. Next, the obtained slurry was transferred to a tray, and dried at 120° C. for 24 hours to obtain a raw material pulverized mixed powder. The specific surface area of ​​the raw material crushed and mixed powder is 25.57m 2 / g. In addition, the molar ratio (Bi / Fe) of bismuth to iron was 1.000.

[0070] Next, the raw material pulverized mixed powder was fired at 550° C. in the air atmosphere for 7 hours to obtain a fired product. The obtained fired product w...

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Abstract

The present invention is an industrially advantageous method for producing a bismuth iron oxide which is represented by BiFeO3 and which has a low amount of impurities. The method for producing the bismuth iron oxide is characterized by comprising: a wet pulverization step for obtaining pulverized and mixed raw material powder by wet-pulverizing and mixing, in the presence of a medium and an aqueous dispersion medium, bismuth subcarbonate powder and iron compound powder; and a firing step for obtaining a bismuth iron oxide represented by BiFeO3 by firing, as a raw material to be fired, the pulverized and mixed raw material powder at 450-700 DEG C.

Description

technical field [0001] The present invention relates to a method for producing dielectric ceramics, piezoelectric ceramics, and bismuth-iron oxides useful as their raw materials. Background technique [0002] Pb(Zr,Ti)O 3 (hereinafter referred to as "PZT") is a known material exhibiting excellent piezoelectric properties, but from the viewpoint of global environmental issues, the use of lead-containing materials in functional materials made of ferroelectrics is strictly regulated. limit. Now, as an alternative material to lead-free PZT, BiFeO 3 And the solid solution using it has attracted much attention. [0003] as BiFeO 3 For example, Patent Document 1 mentioned later proposes a solid-phase method in which bismuth oxide and iron oxide are dry-mixed and fired. In addition, the following method is proposed in Patent Document 2 mentioned later: dissolving iron nitrate and bismuth nitrate in an aqueous solution of nitric acid, adding ammonium bicarbonate and ammonia wate...

Claims

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Application Information

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IPC IPC(8): C01G49/02
CPCC01G49/00C01G49/02C01G49/0018
Inventor 田边信司国田肇
Owner NIPPON CHECMICAL IND CO LTD
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