Compositional analysis and electrical properties of Sb, Mn-doped barium strontium titanate PTCR ceramics with TiO2 and SiO2 sintering additives
The secondary phase compositions in Sb-doped (Ba, Sr)TiO3 ceramics containing SiO2 and excess TiO2 sintering additives have been examined by XRD, BEI and EPMA techniques. It is shown that alongside the primary (Ba0.797Sr0.2Sb0.003) TiO3 phase, (Ba1.95Sr0.05)2(Ti 1.2Si1.8)O8 and Sb-doped (Ba 0.99Sr0....
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| Main Authors: | , , , , |
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| Format: | Conference or Workshop Item |
| Language: | English |
| Published: |
2014
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| Online Access: | http://www.scopus.com/inward/record.url?eid=2-s2.0-33947185412&partnerID=40&md5=c1bc33d84bd5dd53bb57b3de94c8516a http://cmuir.cmu.ac.th/handle/6653943832/5300 |
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| Institution: | Chiang Mai University |
| Language: | English |
| Summary: | The secondary phase compositions in Sb-doped (Ba, Sr)TiO3 ceramics containing SiO2 and excess TiO2 sintering additives have been examined by XRD, BEI and EPMA techniques. It is shown that alongside the primary (Ba0.797Sr0.2Sb0.003) TiO3 phase, (Ba1.95Sr0.05)2(Ti 1.2Si1.8)O8 and Sb-doped (Ba 0.99Sr0.01)6Ti17O40 phases form at the intergranular regions. Substitution of up to 0.04 mol% MnO2 enhances the PTCR effect, giving a ratio ρmax/ ρmin ∼ 7 × 105 for the optimum 0.04% MnO2 composition. At this level Mn cannot be detected in the microstructure by EPMA, however in insulating samples containing 0.08 mol% of MnO2, it was detected in the (Ba0.99Sr0.01) 6Ti17O40 intergranular phase. © Springer Science+Business Media, LLC 2007. |
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