Preparation and characterization of composites of ferroelectric and nanoscale metal particles

摘要

Recently, composites of dielectric matrices and diffused phase of metal particles, colloids or clusters are of great interest for their optical, electrical and magnetic properties and potential applications. Many novel physical phenomena, such as optical nonlinearity, were observed and studied in these materials, However, up to now, almost all the work on this class of materials is limited in the systems of metal colloids in some simple oxides matrices with low dielectric constant and linear opticalproperties, e..g. SiO_2, A1_2O_3 and ZrO_2, for some technical reason. As a series of oxides with extremely high dielectric constant, optical nonlinearity, and many exotic physical properties, such as piezoelectricity, pyroelectricity and electroopticaleffects, as well as a ferroelectric phase transition at Curiue temperature, ferroelectric can be proposed as a special class of matrices for metal nanoclusters. It can be predicted that these new composites should be interesting and significant both forfundamental and for application aspects, due to interaction between different physical components in the ferroelectric matrices and nanoclusters.