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Positive Temperature Coefficient of Electrical Resistivity below 150 K in Barium Strontium Titanate

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The resistivity of Ba(1–y)(1–x)Sry(1–x)LaxTiO3ceramics with x= 0.0025 and y= 0.25, 0.5, 0.75, and 0.9 was measured between 50 and 400 K. A resistivity anomaly corresponding to the positive temperature coefficient of electrical resistivity (PTCR) effect was observed for all compositions. The onset temperature decreased from 320 K (y= 0.25) to 70 K (y= 0.9). The extent of the PTCR effect was significantly enhanced for the strontium-rich composition and reached ∼8 orders of magnitude for y= 0.9. These results strongly suggested the possibility to fabricate PTCR devices based on (Sr,Ba)TiO3 ceramics for application at cryogenic temperatures.
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Keywords: low temperature; positive temperature coefficient of resistivity; titanates

Document Type: Research Article

Affiliations: 1: Institute for Energetics and Interphases, Department of Genoa, National Research Council, 16149 Genoa, Italy 2: Department of Process and Chemical Engineering, University of Genoa, 16129 Genoa, Italy

Publication date: April 1, 2004

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