Method for preparing 0-3 magnetic-electricity composite ceramic through low-temperature sintering realized by induction of nanometer sintering additive through self-propagating

Abstract

The invention belongs to the field of magnetic-electricity composite materials and provides a method for preparing 0-3 magnetic-electricity composite ceramic through low-temperature sintering realized by induction of a nanometer sintering additive through self-propagating. Surfaces of a ferroelectric-phase particle and a ferromagnetic-phase particle are coated with nanometer WO3 and CuO respectively through a self-propagating process, then the coated ferroelectric-phase particle and the ferromagnetic-phase particle are uniformly mixed and subjected to solid-phase sintering, and the magnetic-electricity composite ceramic is prepared. The method has the advantages that (1), due to the introduction of the nanometer sintering additive, 0-3 particle composite ceramic with high density can be prepared through low-temperature sintering; (2), mutual diffusion of a ferroelectric-phase body and a ferromagnetic-phase body is effectively prevented, and the prepared 0-3 particle magnetic-electricity composite ceramic presents a high magneto-electricity coupling effect and has a large electro-electricity coupling coefficient; (3), a technological process is simple, the cost is low, and the method is applicable to preparation of other kinds of 0-3 particle magnetic-electricity composite ceramic.

Description

technical field [0001] The invention belongs to the field of magnetoelectric composite materials, in particular to a method for preparing 0-3 ferroelectric / ferromagnetic particle composite ceramics by low-temperature sintering. Background technique [0002] Multiferroic materials (ferroelectricity, ferromagnetism...) not only have a single ferrotype, but also produce new composite effects through the coupling of ferrotypes. Ferroelectric / ferromagnetic materials (magnetoelectric materials) are the most typical representatives. This material not only has ferroelectricity and ferromagnetism, but also produces a new property - magnetoelectric coupling effect. Multiferroic materials greatly broaden the application range of ferroic materials, and can realize the energy conversion between magnetism-force-electricity or electricity-force-magnetism, and have broad application prospects in magneto-force-electricity converters and magnetic sensors. . [0003] Due to the special requi...

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Problems solved by technology

However, in order to obtain a higher density, the solid-state reaction method requires a higher sintering temperature, which leads to serious interdiffusion between the ferroelectric phase and the ferromagnetic phase during the sintering process, so that the dielectric loss of the prepared granular magnetoelectric composite ceramics is biased. Large, forming conductive paths, ceramics are difficult to polarize, and the magnetoelectric properties are not ideal (Zhou Jianping, He Hongcai, Shi Zhan, Nan Cewen, PMNNT / CoFe 2 o 4 Structure and magnetoelectric properties of composite materials, Journal of Ceramics, 2006, 34(10): 1213-1219; Y.J.Li, X.M.Chen, Y.Q.Lin, Y.H.Tang, Magnetoelectric effect of Ni 0.8 Zn 0.2 Fe 2 o 4 / Sr 0.5 Ba 0.5 Nb 2 o 6 composites, Journal of the European Ceramic Society, 2006, 26, 2839-2844)

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