کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1461545 989620 2014 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
PTCR anomaly in barium-titanate-based composites
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
PTCR anomaly in barium-titanate-based composites
چکیده انگلیسی

We have identified a PTCR anomaly in undoped BaTiO3 (BT) ceramics. This anomaly was ascribed to a disconnection of the semiconducting grains, due to dimensional changes of the BT grains at the Curie point, in a composite composed of two constituent BT phases, one with a low electrical resistivity and the other with a high electrical resistivity. The composite exhibits a significant PTCR effect of three orders of magnitude at the Curie temperature.Using a similar approach, a PTCR anomaly was observed in a composite where copper was used as the conductive matrix, while BT particles were used as the second constitutive phase in the composite, acting as a circuit-breaker, and disconnecting the continuous conducting phase at the Curie temperature.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 40, Issue 6, July 2014, Pages 8033–8036
نویسندگان
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