ZnO varistors prepared by direct mixing of constituent phases
Abstract
ZnO varistors with non-linearity coefficients reaching 50 and low values of the leakage current (approximately 0.01 A/m2), were obtained by a method referred to as `direct mixing of constituent phases'. The method is based on sintering of a mixture of the constituent phases with the following compositions: ZnO phase uniformly doped with Co2+ and Mn2+; intergranular phase: γ-Bi2O3 stabilized with Mn2+ or Zn2+; spinel phase: Zn1.971Ni0.090Co0.030Cr0.247Mn0.090Sb0.545O4. As proved, the obtained varistors are composed of the same phases as those introduced into the system. The influence of composition as well as milling and sintering parameters on the varistor characteristics were investigated. Some varistor powder mixtures were intensively milled before sintering. As a result, high density ceramics with highly homogeneous microstructure were obtained after sintering.
Keywords:
ZnO varistors / milling / sintering / dopingSource:
Materials Transactions, JIM, 2000, 41, 9, 1226-1231Publisher:
- Sendai : Japan Institute of Metals
DOI: 10.2320/matertrans1989.41.1226
ISSN: 0916-1821
WoS: 000165139700029
Scopus: 2-s2.0-0034264884
Institution/Community
Tehnološko-metalurški fakultetTY - JOUR AU - Branković, Zorica AU - Milošević, Olivera AU - Poleti, Dejan AU - Karanović, Ljiljana AU - Uskoković, Dragan PY - 2000 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5325 AB - ZnO varistors with non-linearity coefficients reaching 50 and low values of the leakage current (approximately 0.01 A/m2), were obtained by a method referred to as `direct mixing of constituent phases'. The method is based on sintering of a mixture of the constituent phases with the following compositions: ZnO phase uniformly doped with Co2+ and Mn2+; intergranular phase: γ-Bi2O3 stabilized with Mn2+ or Zn2+; spinel phase: Zn1.971Ni0.090Co0.030Cr0.247Mn0.090Sb0.545O4. As proved, the obtained varistors are composed of the same phases as those introduced into the system. The influence of composition as well as milling and sintering parameters on the varistor characteristics were investigated. Some varistor powder mixtures were intensively milled before sintering. As a result, high density ceramics with highly homogeneous microstructure were obtained after sintering. PB - Sendai : Japan Institute of Metals T2 - Materials Transactions, JIM T1 - ZnO varistors prepared by direct mixing of constituent phases EP - 1231 IS - 9 SP - 1226 VL - 41 DO - 10.2320/matertrans1989.41.1226 UR - https://hdl.handle.net/21.15107/rcub_dais_3865 ER -
@article{ author = "Branković, Zorica and Milošević, Olivera and Poleti, Dejan and Karanović, Ljiljana and Uskoković, Dragan", year = "2000", abstract = "ZnO varistors with non-linearity coefficients reaching 50 and low values of the leakage current (approximately 0.01 A/m2), were obtained by a method referred to as `direct mixing of constituent phases'. The method is based on sintering of a mixture of the constituent phases with the following compositions: ZnO phase uniformly doped with Co2+ and Mn2+; intergranular phase: γ-Bi2O3 stabilized with Mn2+ or Zn2+; spinel phase: Zn1.971Ni0.090Co0.030Cr0.247Mn0.090Sb0.545O4. As proved, the obtained varistors are composed of the same phases as those introduced into the system. The influence of composition as well as milling and sintering parameters on the varistor characteristics were investigated. Some varistor powder mixtures were intensively milled before sintering. As a result, high density ceramics with highly homogeneous microstructure were obtained after sintering.", publisher = "Sendai : Japan Institute of Metals", journal = "Materials Transactions, JIM", title = "ZnO varistors prepared by direct mixing of constituent phases", pages = "1231-1226", number = "9", volume = "41", doi = "10.2320/matertrans1989.41.1226", url = "https://hdl.handle.net/21.15107/rcub_dais_3865" }
Branković, Z., Milošević, O., Poleti, D., Karanović, L.,& Uskoković, D.. (2000). ZnO varistors prepared by direct mixing of constituent phases. in Materials Transactions, JIM Sendai : Japan Institute of Metals., 41(9), 1226-1231. https://doi.org/10.2320/matertrans1989.41.1226 https://hdl.handle.net/21.15107/rcub_dais_3865
Branković Z, Milošević O, Poleti D, Karanović L, Uskoković D. ZnO varistors prepared by direct mixing of constituent phases. in Materials Transactions, JIM. 2000;41(9):1226-1231. doi:10.2320/matertrans1989.41.1226 https://hdl.handle.net/21.15107/rcub_dais_3865 .
Branković, Zorica, Milošević, Olivera, Poleti, Dejan, Karanović, Ljiljana, Uskoković, Dragan, "ZnO varistors prepared by direct mixing of constituent phases" in Materials Transactions, JIM, 41, no. 9 (2000):1226-1231, https://doi.org/10.2320/matertrans1989.41.1226 ., https://hdl.handle.net/21.15107/rcub_dais_3865 .