Method for preparing sodium niobate fiber by combining hydrothermal method and later thermal treatment process

A technology of sodium niobate and hydrothermal method, which is applied in the field of preparation of one-dimensional sodium niobate materials, can solve the problems of the preparation method of sodium niobate fibers, etc., and achieve the effects of good dispersion, perfect growth and development, and obvious fiber characteristics

Inactive Publication Date: 2014-09-10
QIQIHAR UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no report about the preparation method of sodium niobate fiber so far

Method used

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  • Method for preparing sodium niobate fiber by combining hydrothermal method and later thermal treatment process
  • Method for preparing sodium niobate fiber by combining hydrothermal method and later thermal treatment process
  • Method for preparing sodium niobate fiber by combining hydrothermal method and later thermal treatment process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Weigh 24g of sodium hydroxide and 0.2g of niobium oxide, add the two materials into a beaker filled with 60ml of deionized water, and stir magnetically at 60°C for 2h until the mixed solution becomes a white slurry without obvious solid particle precipitation.

[0021] 2. Pour the white slurry obtained after stirring evenly into a PTFE-lined hydrothermal reaction kettle with a volume of 100ml. At the same time, add a magnetic stirrer in the reaction kettle, seal it and put it into the oil with magnetic stirring function React in a bath at 160°C for 6 hours. During the reaction, magnetic stirring is always maintained at a rate of 60 r / min.

[0022] 3. After the reaction, the obtained white precipitate was filtered, washed repeatedly with deionized water, and dried at a constant temperature of 110° C. for 12 hours in a blast drying oven.

[0023] 4. Put the obtained initial product into a muffle furnace for heating at 400° C. for 2 hours, then cool down to room tempera...

Embodiment 2

[0025] 1. Weigh 48g of sodium hydroxide and 0.4g of niobium oxide, add the two materials into a beaker filled with 120ml of deionized water, and stir magnetically at 60°C for 2 hours until the mixed solution becomes a white slurry without obvious solid particle precipitation.

[0026] 2. Pour the white slurry obtained after stirring evenly into a PTFE-lined hydrothermal reaction kettle with a volume of 200ml. At the same time, add a magnetic stirrer in the reaction kettle, seal it and put it into the oil with magnetic stirring function React in a bath at 160°C for 6 hours. During the reaction, magnetic stirring is always maintained at a stirring rate of 120 r / min.

[0027] 3. After the reaction, the obtained white precipitate was filtered, washed repeatedly with deionized water, and dried at a constant temperature of 110° C. for 12 hours in a blast drying oven.

[0028] 4. Put the obtained initial product into a muffle furnace and heat it at 450°C for 2 hours, then cool to roo...

Embodiment 3

[0030] 1. Weigh 24g of sodium hydroxide and 0.2g of niobium oxide, add the two materials into a beaker filled with 60ml of deionized water, and stir magnetically at 60°C for 2h until the mixed solution becomes a white slurry without obvious solid particle precipitation.

[0031] 2. Pour the white slurry obtained after uniform stirring into a 100ml polytetrafluoroethylene-lined hydrothermal reaction kettle, seal it and put it in an oil bath at 160°C for 6 hours, without stirring during the reaction.

[0032] 3. After the reaction, the obtained white precipitate was filtered, washed repeatedly with deionized water, and dried at a constant temperature of 110° C. for 12 hours in a blast drying oven.

[0033] 4. Put the obtained initial product into a horse-boiling furnace and heat it at 650°C for 2 hours, then cool to room temperature with the furnace, and the final product is fibrous sodium niobate. Weigh the obtained sodium niobate fiber, and its weight is about 0.05g , the scan...

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Abstract

The invention discloses a method for preparing sodium niobate fiber by combining a hydrothermal method and a later thermal treatment process. The method is characterized in that sodium hydroxide and niobium oxide are used as raw materials, sodium hydroxide is simultaneously used as a hydrothermal reaction mineralizing agent, and deionized water is used as a hydrothermal reaction solvent. The method comprises the steps of preparing an initial product under the conditions that the concentration of sodium hydroxide is 10mol/L, the concentration of niobium oxide is 0.0125mol/L, the hydrothermal temperature is 160 DEG C and the reaction time is 6-8h; and then, placing the initial product into a muffle furnace, and keeping the temperature of 400-650 DEG C for 1-3h to obtain a final product, i.e., the sodium niobate fiber with the diameter of 300-900nm and the length of 100-150mu m. The fiber as the final product is very obvious in characteristic, relatively good in dispersibility and perfected in growth and development. The method disclosed by the invention has the advantages that the raw materials are easy to obtain and low in price, experimental equipment is simple, the process flow is easy to control, and the prepared sodium niobate fiber has relatively good development prospect on the aspects such as preparation and application of antiferroelectric sodium niobate, texturing research on potassium sodium niobate based leadless piezoelectric ceramics and the like.

Description

technical field [0001] The invention relates to a preparation method of a one-dimensional sodium niobate material. Background technique [0002] Sodium niobate is an antiferroelectric at room temperature and has a high dielectric constant at the Curie temperature, which has potential value in the application of piezoelectric devices and acoustic sensors. As an antiferroelectric, sodium niobate can also form solid solution ceramics with different characteristics with ferroelectrics of various structures. Sodium niobate-based lead-free piezoelectric ceramics have unique physical properties: low density, high acoustic velocity, dielectric constant, mechanical quality factor, and a wide range of piezoelectric constants. Due to the excellent piezoelectric and electro-optical properties of sodium niobate-based solid solution, it is widely used in capacitors and positive temperature coefficient thermistors and other fields. [0003] In recent years, many methods including sol-gel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G33/00
Inventor 杨秀英张德庆石峰
Owner QIQIHAR UNIVERSITY
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