Properties of barium-strontium titanate PTCR ceramics sintered on different powder beds |
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| Authors: | Email author" target="_blank">Pornsuda?BomlaiEmail author Steven?J?Milne |
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| Affiliation: | (1) Materials Science Program, Faculty of Science, Prince of Songkla University, Songkhla, 90112, Thailand;(2) Institute for Materials Research, University of Leeds, Leeds, LS2 9JT, UK |
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| Abstract: | Barium-strontium titanate (BST) ceramics, co-doped with Sb and Mn oxides, were sintered on different powder beds: Sb-doped
BST; Al2O3; or Sb,Mn-codoped BST powder. Phase formation, microstructure and the electrical properties of the samples were analysed.
The PTCR behavior depended significantly on the type of powder bed used. The BST ceramic pellet sintered on the Sb-BST powder
displayed the largest PTCR effect, with a ρmax/ρRT ratio of ∼106. This was an order of magnitude greater than for samples sintered on the other two powders. Complex impedance analysis confirmed
that this was due to a large increase in grain boundary resistance at 250 °C. |
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