Synthetic method of sodium potassium columbate ferroelectric nano structure with monoclinic phase

A technology of sodium potassium niobate and a synthesis method, applied in nanotechnology, nanotechnology, nanotechnology and other directions for materials and surface science, can solve problems such as high cost, poor product consistency, and high lead toxicity

Active Publication Date: 2015-09-02
HARBIN INST OF TECH
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Problems solved by technology

[0003] The purpose of the present invention is to solve the technical problems of poor consistency of the product due to volatilization of lead oxide in the preparation process of existing piezoelectric materials, high cost, and high toxicity

Method used

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  • Synthetic method of sodium potassium columbate ferroelectric nano structure with monoclinic phase
  • Synthetic method of sodium potassium columbate ferroelectric nano structure with monoclinic phase
  • Synthetic method of sodium potassium columbate ferroelectric nano structure with monoclinic phase

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specific Embodiment approach 1

[0015] Specific embodiment one: the synthetic method of sodium potassium niobate ferroelectric nanorod of the present embodiment is as follows:

[0016] 1. Add sodium acetate and potassium acetate to 20ml of ethylene glycol at a molar ratio of (7-12):28, and stir at room temperature until the mixture of sodium acetate and potassium acetate is completely dissolved to obtain solution A;

[0017] 2. In the state of stirring, add niobium ethanol solution dropwise to solution A, so that the molar ratio of the sum of sodium ions and potassium ions to niobium ions is 1:1, and then stir at room temperature for 6 hours to obtain niobic acid Sodium potassium sol;

[0018] 3. Dry the sodium potassium niobate sol at 50°C-80°C for 48h-168h until the sol is completely dry to obtain a dry gel precursor;

[0019] 4. In a 10ml polytetrafluoroethylene lining, mix sodium hydroxide and potassium hydroxide at a molar ratio of (7~12):28 to make 8ml of an aqueous solution containing sodium hydroxid...

specific Embodiment approach 2

[0020] Embodiment 2: This embodiment differs from Embodiment 1 in that in step 1, sodium acetate and potassium acetate are added to 20 ml of ethylene glycol at a molar ratio of 0.24:0.76. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0021] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the drying temperature in step 3 is 80°C. Others are the same as those in the first or second embodiment.

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Abstract

The invention provides a synthetic method of a sodium potassium columbate ferroelectric nano structure with a monoclinic phase. The invention relates to a piezoelectric-ferroelectric nano material, and in particular relates to a synthetic method of a nano structure. The invention aims to solve the technical problems that during the preparation of an existing piezoelectric material, lead oxide is volatilized to result in poor consistency and high cost of a product and the toxicity of lead is high, and successfully prepare the sodium potassium columbate nano structure with the monoclinic phase. The synthetic method comprises the following steps: adding sodium acetate and potassium acetate into glycol, adding a niobium ethoxide solution, and drying to obtain a xerogel precursor; adding the xerogel precursor into an aqueous solution containing sodium hydroxide and potassium hydroxide; heating and preserving the heat; then cooling to the room temperature; taking out sodium potassium columbate powder; performing centrifugal washing for a plurality of times until the pH value is equal to 7; and then drying to obtain the sodium potassium columbate ferroelectric nano structure. The synthetic method provided by the invention adopts sodium potassium columbate sol prepared by a sol-gel method, so that the ratio of sodium ions to potassium ions to niobium ions in the nano structure can be accurately controlled; and hydro-thermal reaction is utilized, so that the sodium potassium columbate nano structure with a pure phase is obtained by virtue of low-temperature crystallization. The synthetic method provided by the invention belongs to the field of preparation of nano structures.

Description

technical field [0001] The invention belongs to a piezoelectric-ferroelectric nano material, in particular to a synthesis method of a nano structure. Background technique [0002] Piezoelectric materials are widely used in today's society, especially in piezoelectric transducers, filters and sensors. At present, the main object of research is lead-based piezoelectric materials. In the preparation process, not only the lead oxide volatilization makes the product consistency poor, the cost is high, but also the toxicity of lead is high, which will cause irreversible damage to human organs and the brain nervous system, and affect the ecological environment. serious pollution. Therefore, all countries have carried out research on lead-free piezoelectric ceramics. Among them, sodium potassium niobate with a perovskite structure is a promising lead-free piezoelectric material and optical material, because it has excellent ferroelectric, piezoelectric, electromechanical Conversio...

Claims

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Application Information

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IPC IPC(8): C01G33/00B82Y30/00
Inventor 王文孟祥鹤樊姗柯华饶建存周玉
Owner HARBIN INST OF TECH
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