Electrical properties of the SnO2-based varistor
MetadataShow full item record
The non-linear electrical properties of CoO-doped and Nb205-doped SnO2 ceramics were characterized. X-ray diffraction and scanning electron microscopy indicated that the system is single phase. The electrical conduction mechanism for low applied electrical field was associated with thermionic emission of the Schottky type. An atomic defect model based on the Schottky double-barrier formation was proposed to explain the origin of the potential barrier at the ceramic grain boundaries. These defects create depletion layers at grain boundaries, favouring electron tunnelling at high values of applied electrical field. © 1998 Chapman & Hall.
How to cite this document
Showing items related by title, author, creator and subject.
Cossi, Antônio Marcos ; Romero, Rubén ; Sanches Matovani, José Roberto (IEEE Transactions on Power Delivery, 2005) [Artigo]In this work, the planning of secondary distribution circuits is approached as a mixed integer nonlinear programming problem (MINLP). In order to solve this problem, a dedicated evolutionary algorithm (EA) is proposed. ...
Canesin, Carlos A. ; Barbi, Ivo (PESC Record - IEEE Annual Power Electronics Specialists Conference, 1997) [Trabalho apresentado em evento]This paper presents a novel single-phase high power factor PWM boost rectifier, featuring soft commutation of the active switches at zero-current (ZCS). It incorporates the most desirable properties of the conventional PWM ...
Gonçalves, Flávio A. S. ; Canesin, Carlos A. ; Melo, Guilherme A. ; De Freitas, Luiz C. G. (2009 Brazilian Power Electronics Conference, COBEP2009, 2009) [Trabalho apresentado em evento]This paper deals with results of a research and development (R&D) project in cooperation with Electric Power Distribution Company in São Paulo (Brazil) regarding the development and experimental analysis of a new concept ...