Nano-powder on properties of piezoelectric ceramics?
20th century materials scientists around the world began to explore new ferroelectric material, the first time the study introduced the concept of nano-piezoelectric material, the piezoelectric material of this research and development of functional materials is facing a major breakthrough, reflected in the material changes in performance, it is the mechanical properties, piezoelectric properties, dielectric properties has been significantly improved, which will undoubtedly change to improve energy performance, resulting in a positive impact.
The main approach of functional studies in nano piezoelectric material concepts for improving certain properties of piezoelectric material, and the formation of nanocomposite and nano powder or nano piezoelectric crystals add different nanoparticles in piezoelectric materials and polymer composite material made of two kinds of methods through special means. Department of Qinghua University, for example, the material in order to improve the saturation polarization and remnant polarization of the ferroelectric ceramic materials, adding Ag nanoparticles prepared "metal nanoparticles / ferroelectric ceramics based nanocomposite ferroelectric ceramics"; foreign Hwang JH etc. made of AL2O3 / PZT, ZrO2 / PZT and other ferroelectric ceramic nanocomposite reduce k31 original ferroelectric material and increase fracture toughness; Xi'an Jiaotong University, piezoelectric nano-composite materials and polymer together to obtain nano piezoelectric composite materials. This time we have to study the piezoelectric nano-powders and nano-organic additives to prepare a piezoelectric ceramic composite, and then study the change of the piezoelectric properties and dielectric properties.
Experiments using high-performance ball Xi'an Jiaotong University, will be pre-cooked preparation PZT-5 piezoelectric powder into a particle size of 100nm piezoelectric powder (TEM morphology and particle size distribution which Figure 1 and Figure 2). and then a particle size less than 100nm purchased additive (which TEM morphology see Figure 3), according to a certain proportion of piezoelectric PZT-5 nano-powders together uniformly confusion, three kinds were tried molding and sintering methods. Piezoelectric and dielectric properties of ceramic materials prepared as d33, d31 values developed by the Institute of Acoustics quasi-static d33 / d31 meter to measure the relative permittivity ε ^ t33 / ε0 mechanical quality factor Qm, frequency by Hewlett-Packard (HP) 4192A impedance analyzer measurements, calculations.
