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http://dx.doi.org/10.4313/TEEM.2009.10.4.125

Clamping Voltage Characteristics and Accelerated Aging Behavior of CoCrTb-doped Zn/Pr-based Varistors with Sintering Temperature  

Nahm, Ghoon-Woo (Semiconductor Ceramics Lab., Department of Electrical Engineering, Dongeui University)
Publication Information
Transactions on Electrical and Electronic Materials / v.10, no.4, 2009 , pp. 125-130 More about this Journal
Abstract
The clamping voltage characteristics and accelerated aging behavior of CoCrTb-doped Zn/Pr-based varistors were investigated for different sintering temperatures. The best clamping voltage characteristics were obtained for the varistors sintered at $1330^{\circ}C$, with a clamping voltage ratio (K) of 1.63 at a surge current of 5 A and 1.75 at a surge current of 10 A. The varistors sintered at $1330^{\circ}C$ exhibited the highest stability, with -0.1% in $%{\Delta}E_{1\;mA}$, -0.2% in $%{\Delta}{\alpha}$, and +15.5% in $%{\Delta}J_L$ for E-J characteristics under a stress state of 0.90 $E_{1\;mA/120^{\circ}C$ /24 h. Furthermore, it exhibited $%{\Delta}{\varepsilon}_{APP}$' of -0.7% and $%{\Delta}tan{\delta}$ of +5.7% for dielectric characteristics under the same stress state.
Keywords
Sintering; Clamping voltage; DC accelerated aging; Varistors;
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