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Abstract
Modified Lead Titanate Ceramics, known for high anisotropy, exhibit very good temperature and time stability of frequency constant. In order to optimize these properties, varying amounts of rare earth elements were used as additives. Microstructure to ceramics was then controlled by means of electronmicroscopy, also as an approach to connect poling process conditions to changes in microstructure of piezoceramics and their piezoelectric properties. Piezoelectric data are presented together with results for time/temperature stability tests for chosen compositions.