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A method for preparing composite alkali metal niobate powder

A technology of niobate and compound alkali, which is applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, niobium compounds, etc., can solve the problems of high equipment requirements and high energy consumption, and achieve low cost, Simple operation, promoting the effect of applied research

Inactive Publication Date: 2021-03-16
BEIJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the method is milder than the high-temperature solid-phase synthesis process, and the particle size of the obtained powder is smaller, it still needs high-temperature calcination, which requires high equipment requirements and high energy consumption.

Method used

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  • A method for preparing composite alkali metal niobate powder
  • A method for preparing composite alkali metal niobate powder
  • A method for preparing composite alkali metal niobate powder

Examples

Experimental program
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Embodiment 1

[0036] The present embodiment provides a kind of method for preparing sodium potassium niobate powder, comprises the following steps:

[0037] (1) Add 0.2g Na 6 Nb 8 o 25 9H 2 O nanowires were dispersed in 10mL of deionized water, and 1.6g of potassium hydroxide-sodium hydroxide mixed alkali was added to make a paste, and then 0.3g of polyacrylamide was added;

[0038] Wherein, the mass ratio of potassium hydroxide and sodium hydroxide in potassium hydroxide-sodium hydroxide mixed alkali is 1:5; the average molecular weight of polyacrylamide is high molecular weight (7 million);

[0039] (2) Using the pasty mixture obtained in step (1) as a reaction precursor, heat treatment was carried out in a closed reactor (20 mL in volume) at a temperature of 200 °C for 24 hours to obtain sodium potassium niobate powder.

[0040] figure 1 The X-ray diffraction pattern of the sodium potassium niobate powder prepared for this example is consistent with the data reported in the literatu...

Embodiment 2

[0043] The present embodiment provides a kind of method for preparing lithium sodium niobate powder, comprises the following steps:

[0044] (1) Add 0.2g Na 6 Nb 8 o 25 9H 2 O nanowires were dispersed in 10mL of deionized water, and 1.6g of lithium hydroxide-sodium hydroxide mixed alkali was added to make a paste, and then 0.3g of polyacrylamide was added;

[0045]Wherein, the mass ratio of lithium hydroxide to sodium hydroxide in lithium hydroxide-sodium hydroxide mixed alkali is 3:1; the average molecular weight of polyacrylamide is high molecular weight (7 million);

[0046] (2) Using the pasty mixture obtained in step (1) as the reaction precursor, heat treatment was carried out in a closed reaction kettle (volume 20mL) at a temperature of 200°C for 24 hours to obtain sodium lithium niobate powder.

[0047] image 3 The X-ray diffraction pattern of the sodium lithium niobate powder prepared for this example is consistent with the data reported in the literature.

[0...

Embodiment 3

[0050] The present embodiment provides a kind of method for preparing sodium potassium niobate powder, comprises the following steps:

[0051] (1) Add 0.1g Na 6 Nb 8 o 25 9H 2 O nanowires were dispersed in 10mL deionized water, and 0.8g potassium hydroxide-sodium hydroxide mixed alkali was added to make a paste, and then 0.1g polyacrylamide was added;

[0052] Wherein, the mass ratio of potassium hydroxide and sodium hydroxide in the potassium hydroxide-sodium hydroxide mixed alkali is 1:1; the average molecular weight of polyacrylamide is low molecular weight (1 million);

[0053] (2) Using the pasty mixture obtained in step (1) as the reaction precursor, heat treatment was carried out in a closed reaction kettle (volume 20 mL) at a temperature of 160°C for 12 hours to obtain sodium potassium niobate powder.

[0054] Figure 5 The X-ray diffraction figure of the sodium potassium niobate powder that the present embodiment prepares; Image 6 It is the scanning electron mi...

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Abstract

The invention provides a method for preparing composite alkali metal niobate powder, the method comprising: using Na 6 Nb 8 o 25 9H 2 O nanometer material is used as a raw material, and a hydrothermal reaction is carried out in a mixed alkali solution and in the presence of polyacrylamide, and the mixed alkali solution contains alkali metal ions in the composite alkali metal niobate. The method provided by the invention has good repeatability, simple operation, and low cost. The prepared composite alkali metal niobate powder, especially sodium potassium niobate and lithium sodium niobate, has good quality and is controllable, and can be used in nanometer devices. The field has good application prospects, and can promote the development of niobate crystallization methods and promote the practical application research of niobate.

Description

technical field [0001] The invention relates to the field of preparation of functional materials, in particular to a method for preparing composite alkali metal niobate powder. Background technique [0002] At present, composite alkali metal niobate nanomaterials play an important role in the field of nanodevices. Among them, sodium potassium niobate (Na x K 1-x NbO 3 ), sodium lithium niobate (Li x Na 1-x NbO 3 ) has great application potential in the fields of gas sensing, catalysis, optics and storage. [0003] However, because niobium oxide often shows chemical inertness and relatively stable properties, the synthesis of complex alkali metal niobate is mostly based on high-temperature solid-phase synthesis, which requires high energy consumption and is difficult to control the composition. Therefore, some researchers turned their attention to chemical synthesis. It was reported that niobium hydroxide was used as niobium source and oxalic acid was used as complexin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G33/00B01J23/20H01L41/18H10N30/85
CPCC01G33/006B01J23/20H10N30/852
Inventor 杜玉成牛炎侯瑞琴吴俊书靳翠鑫李生辉谷恒学
Owner BEIJING UNIV OF TECH
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