TEM was used to observe nanoscale microstructural changes which occur over a range of PMN-PT compositions. Increasing PT additions to the PMN-FT solid solution modify ferroelectric and structurally ordered domains. The relevance of nanostructural changes to the corresponding dielectric properties are briefly discussed.
Dielectric properties of glass-ceramics containing barium/leadbased sodium niobates and barium titanate-based silicates were evaluated for capacitor applications. The glasses were formed by melt-rolling the respective constituents which were then crystallized by reheating them at higher temperatures. Crystallization schedules were formulated based on differential thermal analysis results. X-ray diffractometer patterns indicated that the samples were highly crystallized. Microstructure and microchemistry of samples were studied by transmission electron micropscopy. Perovskite, tungsten-bronze and fresnoite phases developed during crystallization have a strong effect on the resulted dielectric properties with permittivities ranging from 20 to 700. Resistivity measurements were done to study conduction mechanisms in samples and the resistivity values for glass-ceramics were found to be between 10 11 and 10 13 X . cm at 1501C. MnO 2 additions were made to improve the electrical resistivity of glass-ceramics.
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