Compositional analysis and electrical properties of Sb, Mn-doped barium strontium titanate PTCR ceramics with TiO2 and SiO2 sintering additives
作者： P. Bomlai , N. Sirikulrat , A. Brown , E. Condliffe , S. J. Milne
DOI: 10.1007/S10853-006-1058-8
关键词:
摘要: The secondary phase compositions in Sb-doped (Ba, Sr)TiO3 ceramics containing SiO2 and excess TiO2 sintering additives have been examined by XRD, BEI EPMA techniques. It is shown that alongside the primary (Ba0.797Sr0.2Sb0.003)TiO3 phase, (Ba1.95Sr0.05)2(Ti1.2Si1.8)O8 (Ba0.99Sr0.01)6Ti17O40 phases form at intergranular regions. Substitution of up to 0.04 mol% MnO2 enhances PTCR effect, giving a ratio ρmax/ρmin ∼ 7 × 105 for optimum 0.04% composition. At this level Mn cannot be detected microstructure EPMA, however insulating samples 0.08 MnO2, it was phase.
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