Using two different reaction processes to prepare (1-x) KNN-x KBT ferroelectric ceramics

• Main Authors: YANG,SHENG, 楊聖
• Other Authors: YANG,CHENG FU
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/26299965293066079174

碩士 === 國立高雄大學 === 化學工程及材料工程學系碩士班 === 104 === A procedure is using two different reaction processes to prepare (1-x) KNN-x KBT ferroelectric ceramics. The traditional lead zirconate titanate (PZT) based piezoelectric ceramics its excellent electrical properties and is widely used, but these ceramics containing lead regardless of the production, use and disposal process will cause harm to human health, the United States, Japan EU and other countries have initiated legislation to ban the production and use of lead in electronic products. Therefore, the research and development of new lead-free piezoelectric ceramics is an important subject. The piezoelectric effect is when subjected to a physical stress on the lattice, the lattice will strain, but because there is no center of symmetry of the crystal, the crystal not only will strain, but also easy to polarization. This represents subjected to stress can be converted into electrical energy. This characteristic of any substance is known piezoelectric material. This years, the potassium sodium niobate (K0.5Na0.5NbO3-KNN) and the bismuth potassium titanate (K0.5Bi0.5TiO3-KBT) based lead-free piezoelectric ceramics which have a high Curie temperature, relatively high dielectric constant, a high electromechanical coupling factor and good piezoelectric properties are having attention. Although KNN ceramics has many advantages over KBT ceramics , but the volatile alkali metals at high temperatures during the preparation, if the KNN ceramic is prepared by conventional solid-state reaction method is difficult to achieve densification. Therefore, paper is the development and measurement (1-x)KNN -xKBT, where x = 0.05, 0.1, 0.15 and 0.2 of the properties of ceramics, using two different reaction processes to prepare (1-x) KNN-x KBT ferroelectric ceramic block material, and discussed the effects of different processes of the ceramic.