Influnce of Manganese Addition and Reoxidation Process on The Aging Effect of BaTiO3 PTCR

• Main Authors: Meng,Chang Ho, 何孟昌
• Other Authors: Chen,Ying Chung
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/00401238627653838705

碩士 === 國立中山大學 === 電機工程研究所 === 84 === In this study, the PTCR specimens with different Mn contents and reoxidation times were fabricated to investigate their influence on PTCR aging effect. After applying AC voltage (110V) with different times, different measurements were used to obtain variation rates of ρ25℃, PTC order, NT, ψ and grain size. In the study of Mn addition, the PTCR effect increases with the increase of Mn. The grain inhibition effect of Mn results in the increase of polarization directions. Then, it decreases the variation of room-temperature resistivity with applying voltage. In other words, it decreases the aging effect of PTCR. In the study of reoxidation, the increase of reoxidation time makes the grain-boundary oxidation to be more complete.Thus, the spontaneous polarization of domain will be stable, which results in the difficulty of variation of room- temperature resistivity with applying voltage. So, the increase of reoxidation time can decrease the aging effect of PTCR. From above results, appropriate Mn addition and suitable reoxidation time can increase PTCR effect and stability of structure to control the aging effect of PTCR.