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Method for preparing nanbo3 powder by sol-gel method and sintering to obtain single crystal

A technology of powder and single crystal, which is applied in the field of NaNbO3 single crystal to achieve uniform composition, improve uniformity and reduce powder size

Inactive Publication Date: 2018-06-12
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there is no sol-gel method to prepare NaNbO 3 Related reports on powder and sintering to obtain single crystal

Method used

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  • Method for preparing nanbo3 powder by sol-gel method and sintering to obtain single crystal
  • Method for preparing nanbo3 powder by sol-gel method and sintering to obtain single crystal
  • Method for preparing nanbo3 powder by sol-gel method and sintering to obtain single crystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (9) NaNbO obtained in the above-mentioned comparative example 1 step (8) 3 Ceramic powder a was ball-milled for 6h to obtain NaNbO with better dispersibility 3 Nano powder b, see SEM image of powder b figure 1 -b, see the XRD pattern of powder b figure 2 .

Embodiment 2

[0045] (10) NaNbO with better dispersibility obtained in the above-mentioned step (9) of Example 1 3 The nano-powder was molded under a pressure of 150 MPa, and a cylindrical sample with a diameter of 11.5 mm and a thickness of 1.5 mm was formed. Then, using a double crucible seal, add NaNbO 3 The ceramic powder was used as a protective atmosphere, and the temperature was raised to 650°C at a heating rate of 7°C / min at room temperature, without the heat preservation process, and then increased to 950°C at a temperature increase rate of 3.5°C / min, without the heat preservation process, and continued to 3 The heating rate of ℃ / min was increased to 1150 ℃ and kept for 2 hours, then cooled to 1000 ℃ at a rate of 10 ℃ / min, without the heat preservation process, continued to cool down to 800 ℃ at a rate of 3.5 ℃ / min, and cooled with the furnace for about 7 hours Then take out the sample. Obtained containing NaNbO 3 Single-crystal grained ceramic body c, of which the single-crysta...

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Abstract

The invention discloses a method for making NaNbO3 powder through a sol-gel method and obtaining monocrystals through sintering and belongs to the technical field of electronic ceramic materials. According to the method, Nb2O5 and KOH are mixed, calcinated and dissolved in water, the titration pH is equal to 2-3, and sediment is collected and dissolved in oxalic acid; the titration pH is equal to 10-11, centrifugation is performed to obtain white sediment, and the white sediment is dissolved in citric acid to obtain a solution I; a Na2CO3 solution and the solution I are mixed and heated to obtain sol, and the sol is dried; organic matter in the dried sol is removed, the sol without organic matter is ground before being calcinated at the temperature between 550 DEG C and 650 DEG C, powder obtained after calcinations is ball-milled, and then the NaNbO3 powder can be obtained. The NaNbO3 powder is subjected to pressure forming and double-crucible sintering, the initial temperature is room temperature which is raised to the sintering temperature at different rates, the sintering temperature is kept for 2h and then dropped to 800 DEG C at different dropping rates, and samples are taken out along with cooling of a furnace. The NaNbO3 powder has an orthorhombic perovskite structure, and NaNbO3 monocrystals can be obtained when the NaNbO3 powder is sintered at specific temperature.

Description

technical field [0001] The invention relates to a kind of Sol-gel method for preparing piezoelectric ceramic NaNbO 3 Nano-powder and optimized sintering process can obtain NaNbO 3 The single crystal method belongs to the technical field of electronic ceramics. Background technique [0002] With the advent of the information age, various new electronic materials with excellent properties have begun to attract people's attention and attention. Piezoelectric ceramics are an important part of electronic ceramics and are an extremely important class of functional materials that are being researched and developed by countries all over the world. Among them, ceramics with perovskite crystal structure are the most typical piezoelectric ceramics, and they are also being studied in the field of current materials. One of the hot spots. [0003] NaNbO 3 It is a lead-free perovskite-like antiferroelectric with strong electric field-induced ferroelectricity. Due to the co-top-linked ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/30C30B1/00C04B35/624C04B35/495
CPCC04B35/495C04B35/624C04B2235/3201C04B2235/3251C04B2235/661C30B1/00C30B29/30
Inventor 侯育冬张云溪陈鸿熙岳云鸽郑木鹏朱满康严辉
Owner BEIJING UNIV OF TECH
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