Seepage type Ag-PbTiO3 composite ceramic film and preparation method therefor

Abstract

The invention discloses a seepage type Ag-PbTiO3 compound ceram film composed of 75-99.5 % by volume of PbTiO3 and 0.5-25% by volume of Ag. There are several steps: allocating the tetra-n-butyl titanate into Ti solution; dissolving the plumbi nitras in the hybrid solution having the lactic acid and citric acid as complex agent, glycol methyl ether as solvent to form a sol containing Pb; then mixing two sol and dissolving the silver nitrate for a sol precursor; firstly coating on the base plate by dipping lifting method, secondly obtaining a Ag-PbTiO3 compound film by reduction atmosphere heat treatment. The invention is simple and easily for an industrial production. The base dielectric phase of the compound film is lead titanate with a Ca-Ti mine phase. The metal conductive phase of the film is silver. It successfully controls the size of the metal grain in film and forms even-distributing and nano-level silver grain in the film. The film has an obvious seep effect and the dielectric coefficient may achieve 3-5 times to the pure lead titanate film.

Description

technical field [0001] The invention relates to a dielectric film and a preparation method thereof, in particular to a percolation type silver (Ag)-lead titanate (PbTiO 3 ) Dielectric composite ceramic film material and preparation method thereof. Background technique [0002] In recent years, metal-dielectric composite materials have gradually become an important research hotspot in the field of materials science and solid state physics. The research on metal-dielectric composite materials is mainly based on two basic characteristics: on the one hand, after the metal particles are reduced to the nanometer scale, the metal particles themselves present unique nonlinear optical and electromagnetic properties, while the surrounding dielectric The bulk environment can modulate these properties; on the other hand, through the introduction of the metal phase, the dielectric constant, toughness and other physical properties of the dielectric itself can be enhanced. These two char...

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Problems solved by technology

The former utilizes the encapsulation of surfactants, and the metal colloidal particles can maintain a narrow size distribution, but this encapsulation is easily destroyed during the introduction of matrix sol and heat treatment, resulting in the agglomeration of metal particles, which is not conducive to the reduction of metal particles. Particle size and improve the dispersion of metal particles; the latter uses the method of forming metal particles in situ, how to control the appropriate metal volume percentage, the appropriate particle size will become a successful breakthrough in the preparation of percolation type by sol-gel method The key to metal-ceramic composite thin films

In fact, when the metal-dielectric composite film is formed in situ by the sol-gel method, the selection of complexing agent, the adjustment of the heat treatment atmosphere, the adjustment of the degree of hydrolysis, and their synergistic control will all affect the metal particles in the film. The formation and distribution of , thus affecting the generation of percolation effect and the preparation of high-performance thin films

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