Method for preparing sodium-potassium bismuth titanate nano-microspheres by micro-emulsion method

Abstract

The invention discloses a method for preparing sodium-potassium bismuth titanate nano-microspheres by a micro-emulsion method. The method comprises: I, weighing raw materials, dissolving sodium nitrate and potassium nitrate into water to obtain a mixture A, and mixing bismuth nitrate with water to obtain a mixture B; II, mixing cyclohexane with tetrabutyl titanate to obtain a mixture C; III, preparing mixing auxiliaries; IV, mixing the cyclohexane with the mixing auxiliaries to obtain a mixture D, regulating the pH value after dropwise adding the mixture A, and then, dropwise adding the mixture B, thereby obtaining a mixture E; V, mixing the mixture C with the mixture E, forming microemulsion by magnetically stirring, and carrying out ageing treatment on the microemulsion; and VI, centrifugally filtering, getting filter residues, washing and drying the filter residues, thereby obtaining the sodium-potassium bismuth titanate nano-microspheres. According to the method disclosed by the invention, the sodium-potassium bismuth titanate nano-microspheres with single perovskite phase are obtained under a relatively low temperature condition; and the sodium-potassium bismuth titanate nano-microspheres can be widely applied to the high-tech technical fields of sensors, detectors, ultrasonic sensors and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation technology of inorganic functional materials, and in particular relates to a method for preparing bismuth sodium potassium titanate nano-microspheres by a microemulsion method. Background technique [0002] Piezoelectric ceramics are functional materials with a wide range of uses, which can realize mutual conversion between mechanical energy and electrical energy. Bismuth sodium titanate series materials with perovskite structure have excellent characteristics such as large anisotropy of electromechanical coupling coefficient, high Curie temperature, small relative permittivity and good acoustic performance, and low sintering temperature, so they are regarded as One of the most promising candidates to replace traditional lead-containing piezoelectric ceramic materials. The solid solution system developed on this basis is bismuth sodium titanate potassium Na 0.5 Bi 0.5 TiO 3 -K 0.5 Bi 0.5...

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Problems solved by technology

However, this method is easy to mix impurities during the ball milling process, and the prepared piezoelectric ceramic material has relatively low purity, and it is difficult to highly disperse the components in the raw materials, so it is easy to cause the synthetic powder particle size to be uneven, the surface activity is poor, and It is easy to form agglomerates, and these shortcomings seriously affect the electrical properties of piezoelectric ceramic materials. In addition, piezoelectric ceramic materials prepared by traditional solid-state reaction methods can only obtain materials with micron-sized particles

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