Microwave sintering of (Pb0.76Ca0.24)[(Mn1/3Nb2/3)XTi1-X]O3 ceramics

• Main Authors: Chuan-Hsing Chang, 張權興
• Other Authors: Hsien-Lung Tsai
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/55058842032005493285

碩士 === 國立臺灣科技大學 === 機械工程系 === 91 === Abstract (Pb0.76Ca0.24)[(Mn1/3Nb2/3)xTi1-x]O3 (PCMNT) ceramics with two mole-percentages of (Pb(Mn1/3Nb2/3)O3，PMN) were prepared by way of mixed oxide route and processed by either conventional-furnace sintering (C.S.) or microwave sintering (MW.S.).The microstructure and ferroelectrical properties was detected via X-ray diffractometer, Scanning Electron Microscopy, Energy Dispersive Spectrometer (EDS), commercial standard Ferroelectric testing system and Transmission Electron Microscopic (TEM). The results show that the perovskite structure processed via MW.S. has smaller mean grain size and resulted in denser tissue. The c/a ratio decreased as the PMN content increased. The EDS data reveals that there was less loss of PbO in the specimens processed via MW.S. The coercive field (Ec) of specimens subsequent to either MW.S. or C.S. decreased as sintering temperature increased, but the polarization (Pr) was viceversa. From the P-E properties results imply that the same sintering temperature and PMN content, the specimens which upon on MW.S. process, performs higher remanet polarization (Pr) and smaller coercive field (Ec) values at shorten sintering time. TEM analysis reveals that the mean grain size, domain structure, and domain boundary of the microstructure via MW.S. were smaller than C.S. It can be extrapolated that the variance of ferroelectric properties subsequent to MW.S. and C.S. respectively was due to the domain structure formality. The complex domain structure of C.S. specimens resulted in inferior quality.