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Matrix grains of Pb‐relaxor ceramics with chemical inhomogeneity, showing the so‐called core‐shell structure already reported for BaTiO 3 ‐based X7R ceramics, were obtained by a controlled sintering process in a MgO‐excess and PbO‐excess PMN‐PMW‐PT system. Multilayer ceramic capacitors exhibiting the X7T specifications were then fabricated from the 8 mol% MgO excess and 4 mol% PbO excess powder. Their chemical inhomogeneity was stable, showing a decrease of capacitance of only 2.9% after an 800‐h aging test.
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Tsuzuku et al. (1994) studied this question.
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