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A new nanocrystalline TiO2-polymer composite with high volume particle loading has been developed for matching layers of ultra high frequency medical ultrasonic transducers. The composite consists of 25 nm size TiO2 particles and epoxy resin with the acoustic impedance reaching as high as 7.19 MRayls. Ultrasonic spectroscopy methods are used to measure the ultrasonic velocity of the composite thin...
(Ba,Sr)TiO/sub 3/ (BST) thin film capacitors using iridium (Ir) as an electrode material are investigated for high density (1 Gbit-scale and beyond) dynamic random access memories (DRAMs). Excellent electrical characteristics (e.g. high polarization and low leakage) of BST capacitors with Ir top electrodes were obtained. The excellent resistance of these capacitors to hydrogen damage during forming...
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