Method for synthesizing niobate sheet-shaped formwork powder

A synthesis method and niobate technology are applied in the synthesis field of lead-free piezoelectric ceramic powder, which can solve the problems of cumbersome cleaning process, complicated mixing process, low efficiency, etc., and achieve uniform particle distribution, simple production process, and simple process. Effect

Inactive Publication Date: 2015-12-02
白杉 +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] The above-mentioned whole template powder preparation process involves multiple high-temperature reaction processes. However, these processes are high in poll

Method used

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  • Method for synthesizing niobate sheet-shaped formwork powder
  • Method for synthesizing niobate sheet-shaped formwork powder
  • Method for synthesizing niobate sheet-shaped formwork powder

Examples

Experimental program
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Embodiment 1

[0038] The synthesis method of the niobate flaky template powder of the present embodiment comprises the following steps:

[0039] (1) Prepare the niobate precursor solution, the specific operation includes the following sub-steps:

[0040] (1a) Preparation of raw materials; with KOH, NaOH, Nb 2 o 5 1. Surfactant—sodium dodecylbenzenesulfonate (SDBS) is prepared as a raw material, and the addition amount of each raw material is as follows:

[0041] The selected autoclave lining capacity is 50mL, OH - Concentration is 6mol / L, according to K / Na=0.5 (molar ratio), weigh analytically pure KOH=3.499g, NaOH=4.412g, Nb 2 o 5 = 1.25g, SDBS = 0.02g.

[0042] (1b) Preparation of precursor solution;

[0043] Pour the weighed KOH and NaOH into container A with 30mL of deionized water—the beaker, and stir for about 5 minutes. After stirring evenly, pour in Nb 2 o 5 The powder was continuously stirred for 15 minutes to obtain a raw material suspension.

[0044]Take another containe...

Embodiment 2

[0050] This implementation differs from Example 1 in that: in step (2), when the reaction kettle is placed in an oven for reaction, the reaction time is 16 hours and the temperature is 100°C.

[0051] The synthesis conditions of this embodiment can also synthesize potassium sodium niobate crystalline hydrate, and its X-ray diffraction picture is as attached Figure 4 Shown, compared to K 4 Na 4 Nb 6 o 19 9H 2 O; by attaching Figure 5 The scanning electron microscope photos show that the hydrate has a clear hexagonal sheet shape.

Embodiment 3

[0053] This implementation differs from Example 1 in that: in step (2), when the reaction kettle is placed in an oven for reaction, the reaction time is 6 hours and the temperature is 180°C.

[0054] Other synthesis steps of the niobate flaky template powder in this example are the same as in Example 1.

[0055] The synthesis conditions of this embodiment can also synthesize potassium sodium niobate crystalline hydrate, and its X-ray diffraction picture is as attached Image 6 Shown, compared to K 4 Na 4 Nb 6 o 19 9H 2 O; by attaching Figure 7 The scanning electron microscope photos show that the hydrate has a clear hexagonal sheet shape.

[0056] figure 1 , Figure 4 with Image 6 The X-ray diffraction patterns of the potassium sodium niobate crystalline hydrate prepared in Examples 1, 2 and 3 respectively. By comparison, the peak shapes of these three X-ray diffraction patterns are completely consistent, which shows that the crystal phases of potassium sodium niob...

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Abstract

The invention relates to a method for synthesizing niobate sheet-shaped formwork powder. The method comprises the following steps: (1) preparing niobate precursor solution; (2) placing the niobate precursor solution in a high-pressure reaction container, reacting for 1-24 h at 30-200 DEG C, performing cooling and filtration, washing and drying a precipitated product, and obtaining the niobate sheet-shaped formwork powder. According to the synthesizing method, niobate crystalline hydrate is obtained through hydrothermal synthesis at the temperature lower than the temperature for conventional hydrothermal reaction (even at the ultralow temperature close to room temperature) and serves as the formwork powder and is introduced to the field of lead-free piezoelectric materials. Due to the fact that the niobate sheet-shaped formwork powder is simple, clean and environmentally friendly in the manufacturing process, the experimental cost is effectively reduced, and the mass production is facilitated.

Description

technical field [0001] The invention relates to a method for synthesizing a lead-free piezoelectric ceramic powder, in particular to a method for synthesizing a powder material using flake niobate as a template. Background technique [0002] Piezoelectric ceramics are important high-tech functional ceramic materials. However, most of the piezoelectric ceramics used in the market are lead zirconate titanate (PZT) and its doped modified piezoelectric ceramics based on it. A large amount of (PbO) lead oxide The use of lead-free piezoelectric ceramics has brought serious harm to human beings and the ecological environment. As one of the research systems of lead-free piezoelectric ceramics, niobate-based piezoelectric ceramics have excellent electro-optical properties and pyroelectric properties, and have received extensive attention in recent years. . [0003] In the world's top journal Nature in 2004, it was reported that niobate-based textured ceramics obtained performance co...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622
Inventor 白杉徐平
Owner 白杉
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