Read e-book online Electroceramics VI PDF

By Daniel Z. De Florio, Eliana N. S. Muccillo, Fábio C. Fonseca, R. Muccillo

ISBN-10: 3038351431

ISBN-13: 9783038351436

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This effect limits the production of ceramics from this compound and thus, their exploitation as a commercial product. In order to improve the mechanical properties of PbTiO3 ceramics, Pb2+ ions have been substituted by Ca2+, forming the Pb1-xCaxTiO3 (PCT) system [2-6]. This system has strong piezoelectricity and high values of dielectric permittivity at Curie temperature, becoming a good candidate for pyroelectric sensors and dynamic random access memories depending on the Ca composition [7]. Besides the decreasing of Curie temperature, the addition of Ca2+ ions to PbTiO3 compound causes a structural phase transition and the appearance of a relaxor behavior.

As a first attempt, Ikezi et al. [3] have built a NLTL using BaTiO3ferroelectric ceramic slabs inserted between two metal parallel plates as shown in Fig. 1. Using this structure, they produced soliton waves with power peak of 10 MW in the frequency range 250-400 MHz. However, dielectric losses prevented them from obtaining higher frequencies. , 2011, [4] built a NLTL using a parallel platestructure, but they used a different ceramic slab (PMN- lead manganese and niobium) as nonlinear dielectric.

Advanced Materials Research Vol. 23 PZT Dielectric Ceramic Characterization for Application in Nonlinear Transmission Lines Lauro P. Silva Netoa and Jose O. Rossib Associated Plasma Laboratory, National Institute for Space Research S. br Keywords: dielectrics, PZT ceramics, nonlinearity, permittivity, losses, capacitors. Abstract. Nonlinear dielectric lines have been tested for use in RF generation. Although they have presented a reasonable success in the frequency range between 250 and 400 MHz, their main limitation is the dielectric losses of barium titanate (BT) tiles used as nonlinear medium in these lines, which prevents from achieving higher frequencies.

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Electroceramics VI by Daniel Z. De Florio, Eliana N. S. Muccillo, Fábio C. Fonseca, R. Muccillo

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