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Because of its good physical properties (high ac dielectric strength and high thermal conductivity), the polycrystalline Al2O3 is used in IGBT power modules packaging as interface between the electronics device and the cooling system. The various constraints (electrical, thermal and mechanical) undergone by the Al2O3 substrates in service can lead to charge development in surface (surface discharges)...
We present the measured resistivity, Hall coefficient, and magnetization for three kinds of Bi2Sr2CaCu2O8+∂ ceramics subjected to various heat treatments. The Hall effect shows that in this system the carriers have hole-like characteristics. The hole density varies according to the heat treatment; the hole density increases and Tc decreases as a result of oxidation. In spite of the atmosphere in which...
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