標題: Grain-boundary surface states of (Ba, Pb)TiO3 positive temperature coefficient ceramics doped with different additives and its influence on electrical properties
作者: Chen, LF
Tseng, TY
電子工程學系及電子研究所
Department of Electronics Engineering and Institute of Electronics
關鍵字: PTCR;surface states;electrical properties;additives;Heywang barrier
公開日期: 1-九月-1996
摘要: The electrical properties of positive temperature coefficient of resistance (PTCR) ceramics of composition (Ba, Pb, La)TiO3 prepared from commercial BaTiO3 powders doped with different additives were studied. It was proposed here that different additives might have generated the corresponding number of possible surface states, such as, the segregation behavior of Mn ions (3d transition metal ions), oxygen adsorption reaction resulting from BN addition, the action of Ca replacing the Ti sites (Ca''(Ti)), and the natural intrinsic defects (V''(Ba), V''(Pb)). In general, some experimental derivations were also offered that majority of the surface states, which possessed their individual surface energy level, possibly coexisted onto the grain surface. Utilizing the concept of the coexistence of different types of surface states in the energy band, a satisfactory point-to-point agreement was obtained between the measured result and calculated values for the resistivity curve. Our experimental results were analyzed based on the terms of the Heywang-Jonker model and have shown that the assumption of a Hewang barrier was a reasonable approach for our set of samples; however, the distribution and types of grain-boundary acceptor states classification were required.
URI: http://dx.doi.org/10.1109/95.536844
http://hdl.handle.net/11536/1069
ISSN: 1070-9886
DOI: 10.1109/95.536844
期刊: IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY PART A
Volume: 19
Issue: 3
起始頁: 423
結束頁: 430
顯示於類別:期刊論文


文件中的檔案:

  1. A1996VJ59000017.pdf