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Controllable preparation method of orthorhombic-phase rhombohedral-phase sodium niobate having high Curie point

A high Curie point, phase sodium niobate technology, applied in chemical instruments and methods, niobium compounds, inorganic chemistry, etc., can solve the problems of high cost and complicated process, and achieve low preparation cost, high purity and good dispersibility Effect

Inactive Publication Date: 2008-08-27
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The purpose of the present invention is to control the synthesis of trigonal phase and orthorhombic sodium niobate under mild conditions, so as to solve the shortcomings of complicated process and high cost in production, thereby providing a simple process equipment suitable for large-scale production. Preparation

Method used

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  • Controllable preparation method of orthorhombic-phase rhombohedral-phase sodium niobate having high Curie point
  • Controllable preparation method of orthorhombic-phase rhombohedral-phase sodium niobate having high Curie point
  • Controllable preparation method of orthorhombic-phase rhombohedral-phase sodium niobate having high Curie point

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Effect test

Embodiment 1

[0024] Nb with a molar ratio of 1:1 2 o 5 Add NaOH powder to 50 mL of the mixed solution of organic amine and distilled water, and stir at room temperature for 30 minutes at a stirring speed of 120 rpm. The obtained milky white precursor solution was transferred to an autoclave, and then the autoclave was sealed, reacted at 120°C for 5 hours, filtered, and distilled water and anhydrous a-body were used. The morphology of the sample is characterized as a sheet structure with a side length of 0.5-6 μm.

Embodiment 2

[0026] Nb with a molar ratio of 1:5 2 o 5 Add NaOH powder to 50 mL of the mixed solution of organic amine and distilled water, and stir at room temperature for 30 minutes at a stirring speed of 120 rpm. Transfer the obtained milky white precursor liquid into an autoclave, then seal the autoclave, filter at 200°C for 5 hours, wash with distilled water and absolute ethanol, and dry at 80°C for 2 hours to obtain trigonal and orthogonal miscible niobium Sodium Acid Powder.

Embodiment 3

[0028] Nb with a molar ratio of 1:10 2 o 5 Add NaOH powder to 50 mL of the mixed solution of organic amine and distilled water, and stir at room temperature for 30 minutes at a stirring speed of 120 rpm. Transfer the obtained milky white precursor solution to an autoclave, then seal the autoclave, filter at 120°C for 5 hours, wash with distilled water and absolute ethanol, and dry at 80°C for 2 hours to obtain orthogonal phase sodium niobate powder body. The morphology of the sample is characterized as a cubic structure with a side length of 2-10 μm.

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Abstract

The invention belongs to the field of preparing inorganic functional materials, in particular relates to a preparing process for controlled systemization of rhombohedral phase sodium niobate powders and orthorhombic sodium niobate powders in the micro-growing environment which is adjusted by dentate organic amine under hydrothermal condition. The method comprises steps of employing the most common niobium pentoxide and sodium hydroxide as raw materials, adjusting the mole ratio of the niobium pentoxide to the sodium hydroxide and systemizing the rhombohedral phase sodium niobate and the orthorhombic sodium niobate in hydrothermal reaction system of adding the organic amine. The method has the advantages that the process is simple and convenient in operation and low in preparing cost, the prepared products are uniform in morphology and good in dispersity. The prepared rhombohedral phase sodium niobate is better in thermal stability, higher in Curie temperature and sound in ferroelectric property, which can be used for piezoelectric transducer, non-volatile memory and optical device.

Description

technical field [0001] The invention belongs to the field of preparation of inorganic functional materials, and in particular relates to a preparation for the controllable synthesis of trigonal phase and orthorhombic phase sodium niobate powder by adjusting the micro-growth environment through ligand organic amines under hydrothermal conditions method. Background technique [0002] Due to their good dielectric properties, ferroelectricity, piezoelectric effect, pyroelectric effect and photoelectric properties, ferroelectrics have been the frontier and hotspot of new functional materials research for many years. Especially in recent years, the emergence of integrated ferroelectrics, which combines ferroelectric materials and semiconductor materials, has enriched and expanded the application of ferroelectric materials in high-performance microelectronics and optoelectronics such as non-volatile ferroelectric memories, microsensors and optical modulators. Research and applicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G33/00
Inventor 薛冬峰刘美男吴俊书高坤刘飞孙丛婷晏成林纪亮
Owner DALIAN UNIV OF TECH
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