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

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...

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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 of lead, and to provide a monoclinic phase sodium potassium iron niobate Synthesis method of electrical nanostructure, and successfully prepared sodium potassium niobate nanostructure with monoclinic phase, and optimized its phase structure

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