Electrical conductivity of BaRuO sub 3 ceramics

BaRuO sub(3) and Ba sub(1-x)K sub(x)RuO sub(3) ceramics contain a mixture of 4H and 9R polytypes whose volume fraction depends on quenching temperature and the concentration of potassium dopant. Both polytypes have a room temperature resistivity of similar to 10m Omega cm, but with opposite signs fo...

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Bibliographic Details
Published in:Solid state communications 1991-01, Vol.79 (4), p.355-357
Main Authors: Szymanik, B, Edgar, A
Format: Article
Language:English
Online Access:Get full text
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Summary:BaRuO sub(3) and Ba sub(1-x)K sub(x)RuO sub(3) ceramics contain a mixture of 4H and 9R polytypes whose volume fraction depends on quenching temperature and the concentration of potassium dopant. Both polytypes have a room temperature resistivity of similar to 10m Omega cm, but with opposite signs for the temperature coefficient. The negative temperature coefficient for the 9R polytype is ascribed to localisation effects arising from the existence of two distinct crystallographic Ru sites.
ISSN:0038-1098