Wide component window and high transduction coefficient ceramic material for piezoelectric energy collection and preparation

Abstract

The invention discloses a wide component window and high transduction coefficient ceramic material for piezoelectric energy collection and preparation and belongs to the field of piezoelectric ceramicmaterials. The material has a chemical formula of 0.2Pb(Zn1 / 2Nb2 / 3)O3-0.8Pb(Zr1 / 2Ti1 / 2)O3 (abbreviated as 0.2PZN-0.8PZT), AlN with a mole fraction x of mol.% is doped, and x is 0.00-6.00. The preparation comprises the following steps: preparing 0.2PZN-0.8PZT, further adding AlN, and carrying out steps of wet milling, drying, pelletizing, pressing molding and sintering. By adopting the material, relative change trend of piezoelectric charge constants and dielectric constants is effectively regulated and controlled, energy increase coefficients are increased, component windows of high transduction coefficients are greatly widened, dependency of optimal properties upon specific single components is relieved, and great promotion functions can be achieved for further improving electro-mechanical transformation properties and industrial application of piezoelectric energy collection devices.

Description

technical field [0001] The invention belongs to the field of piezoelectric ceramic materials, and in particular relates to a composite ceramic material for piezoelectric energy collection with a wide component window and a high conversion coefficient and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of civilian and military Internet of Things technology, the core device that constitutes the network node - the miniature wireless sensor is playing an increasingly important role in it. However, how to realize the self-power supply of miniature sensors to effectively solve the difficulty of secondary battery replacement in complex power supply wiring of existing sensors or in special extreme environments, so that they can serve for a long time without failure, has attracted the attention of countries all over the world. Since solar energy, wind energy and other new energy sources are too heavily dependent on the environme...

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Problems solved by technology

However, the piezoelectric charge constant and the relative permittivity often show a trend of simultaneous increase or decrease near the MPB. According to the above formula (1-1), this synergistic change seriously hinders the improvement of the conversion coefficient

[0010] Furthermore, the high conversion coefficient of piezoelectric materials in the current research is often obtained at a specific component point, so that piezoelectric ceramics composed of the same raw material but with different component distribution ratios cannot achieve high conversion coefficients according to the actual environment. Give full play to its own advantages, which seriously limits its practical application; at the same time, this also leads to the improvement of the technical difficulty of industrial production

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