Microstructure and Electrical Properties of Lead-Free (Na0.5K0.5)NbO3-Bi0.5(Na1-yKy)0.5TiO3 Ceramics

• Main Authors: Shu Hsien Lin, 林書賢
• Other Authors: Chun Huy Wang
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/81408205447052607272

碩士 === 南榮技術學院 === 工程科技研究所碩士班 === 101 === In the ever-changing society, continuous development and progress of science and technology, international awareness of environmental protection has been gradually enhanced and gradually began to have concerns about elements of the material disabled, the lead zirconate titanate Pb(Zr,Ti)O3 (PZT) piezoelectric ceramics at this stage is the most important material, but in the material composition of lead content, In the production process of the environment and ecology will cause pollution concerns, seeking to take can replace solid material is the most urgent research direction. (Na1-yKy)NbO3, (Bi0.5Na0.5)TiO3 are currently the most potential of lead-free piezoelectric material material systems, the papers selected the main unleaded department of potassium sodium niobate, preparation to the oxide solid-state mixing, changes in sodium bismuth titanate potassium ingredients, Its chemical formula (1-x)(Na0.5K0.5) NbO3-xBi0.5(Na1-yKy)TiO3, x respectively 0.01,0.02,0.03,0.04,0.05, y respectively 0.05,0.17,0.18,0.25, calcination conditions of 950 degrees and holding for four hours, sintering at 1100 degrees isothermal holding temperature respectively 3,5,7 hours, poling time is 30 minutes, a temperature of 160 ℃, the electric field strength of 3kV / mm, measuring the microscopic structure of the nature of the dielectric and piezoelectric properties. From the experimental results, when (x = 0.03, y = 0.25) sintered holding temperature of 5 hours the thickness of the electromechanical coupling factor and piezoelectric constant of up to 46.9%, and 194 (pC / N), when (x = 0.03, y = 0.18) sintered holding temperature of 5 hours the thickness of the electromechanical coupling factor and piezoelectric constant of up to 57.9%, and 199 (pC / N).