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pro vyhledávání: '"Choon-Woo Nahm"'
Autor:
Choon-Woo Nahm
Publikováno v:
Korean Journal of Materials Research. 31:539-545
Autor:
Choon-Woo Nahm
Publikováno v:
Korean Journal of Materials Research. 30:502-508
This paper focuses on the electrical properties and stability against DC accelerated aging stress of ZnO-V2O5-MnO2- Nb2O5-Bi2O3-Co3O4-Dy2O3 (ZVMNBCD) varistor ceramics sintered at 850 - 925 ℃. With the increase of sintering temperature, the average
Autor:
Choon-Woo Nahm
Publikováno v:
Korean Journal of Materials Research. 29:586-591
This study describes the doping effect of Yb2O3 on microstructure, electrical and dielectric properties of ZnO-V2O5- MnO2-Nb2O5 (ZVMN) ceramic semiconductors sintered at a temperature as low as 900°C. As the doping content of Yb2O3 increases, the ce
Autor:
Choon-Woo Nahm
Publikováno v:
Transactions on Electrical and Electronic Materials. 16:308-311
V2O5/Mn3O4/Nb2O5 codoped zinc oxide varistor ceramics were sintered at a temperature range as low as 875~950℃. The voltage clamping characteristics of V2O5/Mn3O4/Nb2O5 codoped zinc oxide varistor ceramics were investigated at a pulse current range
Autor:
Choon-Woo Nahm
Publikováno v:
Transactions on Electrical and Electronic Materials. 16:221-225
Autor:
Choon-Woo Nahm
Publikováno v:
Journal of Rare Earths. 33:403-410
The microstructure, electrical and dielectric properties, and DC-accelerated aging of the ZPCCA (ZnO-Pr 6 O 11 -CoO-Cr 2 O 3 -Al 2 O 3 ) ceramics were investigated with various contents of Er 2 O 3 . The ceramic phases consisted of a bulk phase of Zn
Autor:
Choon-Woo Nahm
Publikováno v:
Transactions on Electrical and Electronic Materials. 15:348-352
In light of the sure protection function, the most important factors of a varistor are the clamping voltage ratio and degradation characteristics. The degradation characteristics of Pr/Co/Cr/Er co-doped zinc oxide varistors were investigated by impul
Autor:
Choon-Woo Nahm
Publikováno v:
Journal of the Korean Ceramic Society. 51:612-617
The microstructure, nonlinear properties, and impulse clamping characteristics of Pr/Co/Cr/Al co-doped zinc oxide ceramics were investigated with various contents of Er₂O₃. Increasing Er₂O₃ content increased the density of the sintered pellet
Autor:
Choon-Woo Nahm
Publikováno v:
Transactions on Electrical and Electronic Materials. 15:284-289
The effects of additives (Nb, Bi and Cr) on the microstructure, varistor properties, and aging behavior of V/Mn/Co/ La/Dy co-doped zinc oxide ceramics were systematically investigated. An analysis of the microstructure showed that all of the ceramics
Publikováno v:
Transactions on Electrical and Electronic Materials. 15:213-216
The microstructure and varistor properties of ZPCCAE () ceramics were investigated with different erbium amounts. Analysis of the microstructure indicated that the ceramics consisted of ZnO grains as a bulk phase, and intergranular layers (mixture of