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Sintering and Electrical Properties According to Sb/Bi Ratio(II) : ZnO-Bi 2 O 3 -Sb 2 O 3 -Co 3 O 4 -Cr 2 O 3 Varistor
| Content Provider | Semantic Scholar |
|---|---|
| Author | Youn-Woo Lee, Youngjin Kim, Sei-Ki Kim, Jinho |
| Copyright Year | 2012 |
| Abstract | We aimed to examine the co-doping effects of 1/6 mol% Mn3O4 and 1/4 mol% Cr2O3 (Mn:Cr = 1:1) on the reaction, microstructure, and electrical properties, such as the bulk defects and grain boundary properties, of ZnO-Bi2O3-Sb2O3 (ZBS; Sb/Bi = 0.5, 1.0, and 2.0) varistors. The sintering and electrical properties of Mn,Cr-doped ZBS, ZBS(MnCr) varistors were controlled using the Sb/Bi ratio. Pyrochlore (Zn2Bi3Sb3O14), α-spinel (Zn7Sb2O12), and δ-Bi2O3 (also β-Bi2O3 at Sb/Bi ≤ 1.0) were detected for all of the systems. Mn and Cr are involved in the development of each phase. Pyrochlore was decomposed and promoted densification at lower temperature on heating in Sb/Bi = 1.0 system by Mn rather than Cr doping. A more homogeneous microstructure was obtained in all systems affected by α-spinel. In ZBS(MnCr), the varistor characteristics were improved dramatically (non-linear coefficient, α = 40~78), and seemed to form Vo . (0.33 eV) as a dominant defect. From impedance and modulus spectroscopy, the grain boundaries can be seen to have divided into two types, i.e. one is tentatively assigned to ZnO/Bi2O3 (Mn,Cr)/ZnO (0.64~1.1 eV) and the other is assigned to the ZnO/ZnO (1.0~1.3 eV) homojunction. |
| Starting Page | 675 |
| Ending Page | 681 |
| Page Count | 7 |
| File Format | PDF HTM / HTML |
| DOI | 10.3740/MRSK.2012.22.12.675 |
| Volume Number | 22 |
| Alternate Webpage(s) | http://ocean.kisti.re.kr/downfile/volume/mrsk/GJRHBQ/2012/v22n12/GJRHBQ_2012_v22n12_675.pdf |
| Alternate Webpage(s) | https://doi.org/10.3740/MRSK.2012.22.12.675 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
