Grain Size Effects of SnO2 Varistor Induced by Doping Pr
2007 ◽
Vol 280-283
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pp. 275-278
Keyword(s):
The effects of Pr on the microstructure and nonlinear electrical properties of the (Co,Ta)-doped SnO2 varistors were investigated. It was found by characterizing the samples sintered at 1350 oC that the breakdown voltage increases significantly from 500v/mm to 1200v/mm, and the relative permittivity decreased rapidly from 2525 to 1199 with increasing Pr6O11 concentration from 0 to 1.20 mol%. The analysis of samples’ microscopic structure showed that the grain size of SnO2 rapidly decreases from 5.1 to 3.7 µm with increasing Pr6O11 concentration from 0 to 1.20mol% .The significant decrease of SnO2 grain size is the main reason for raising breakdown voltage and reducing permittivity.
2012 ◽
Vol 24
(2)
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pp. 784-792
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Keyword(s):
2019 ◽
Keyword(s):
1984 ◽
Vol 56
(3)
◽
pp. 343-345
◽
Keyword(s):
1986 ◽
Vol 22
(1)
◽
pp. 14-18
◽
2005 ◽
pp. 1-8
◽
2002 ◽
Vol 46
(7)
◽
pp. 483-488
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