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Erschienen in:
28.08.2017
Effects of La3+ doping on the crystal structures, densities, microstructures and thermosensitive characteristics of the LaxBa1−xCoO3−δ (0 ≤ x ≤ 0.1) ceramics for low temperature NTC resistances
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 23/2017
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Abstract
In this work, polycrystalline LaxBa1−xCoO3−δ (0 ≤ x ≤ 0.1) ceramic samples were prepared by conventional solid-state reaction process. La3+ doping effects on the crystal structures, densities, microstructures and thermosensitive characteristics of the LaxBa1−xCoO3−δ ceramics were investigated. The major phase presented in the sintered samples is a hexagonal perovskite BaCoO2.6 phase. The doping of La3+ reduces the quantity of voids and improves the densities of the LaxBa1−xCoO3−δ ceramics compared with La-free ceramic. The resistivities of the LaxBa1−xCoO3−δ ceramics decrease exponentially with increasing temperature in each of the range of 10–26 K and 26–100 K. The resistivities and B constants increase as the contents of La3+ increase in the LaxBa1−xCoO3−δ ceramics.