Abstract
We measured the coefficient of thermal expansion (CTE) of conducting composite ceramics 30 vol.% CuO-mixed CaCu3Ru4O12 together with CaCu3Ru4O12 and CuO. Although conducting ceramics tend to show higher CTE values than insulators, and its CTE value does not match with other ceramic materials, the CTE of CaCu3Ru4O12 (7–9 × 10−6/K) was as small as those of insulators such as CuO (9 × 10−6/K), alumina (8 × 10−6/K), and other insulating perovskite oxides. We propose that the thermal expansion of CaCu3Ru4O12 was suppressed by the Cu-O bond at the A-site due to the Jahn–Teller effect. This unusually small CTE of CaCu3Ru4O12 compared to other conducting oxides plays a vital role enabling successful coating of 30 vol.% CuO-mixed CaCu3Ru4O12 thick films on alumina substrates, as demonstrated in our previous study.
Highlights
The coefficient of thermal expansion (CTE) and matching the thermal expansion between different materials are important factors when processing brittle ceramic materials that require high sintering temperatures
CaCu3Ru4O12 thick film heaters on alumina substrates were robust against thermal shock and rapid performance as the sensor using Pt
The lattice constant increased with increasing temperature, indicating positive thermal expansion, similar to other other conventional conventional oxide oxide materials
Summary
The coefficient of thermal expansion (CTE) and matching the thermal expansion between different materials are important factors when processing brittle ceramic materials that require high sintering temperatures. The temperature dependences of the resistivity of 20 vol % CuO-mixed CaCu3Ru4O12 bulk and the fabrication of dense bulks and thick films on alumina substrates [26]. Our trial we tried to fabricate a SnO2 gas sensor using CuO-mixed CaCu3 Ru4 O12 thick films as electrodes successfully showed similar sensing performance as the sensor using Pt. In addition, CuO-mixed and heater instead of Pt on an alumina substrate [28]. CaCu3Ru4O12 thick film heaters on alumina substrates were robust against thermal shock and rapid performance as the sensor using Pt. In addition, CuO-mixed CaCu3 Ru4 O12 thick film heaters on thermal cycling.
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