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This paper presents new results of low frequency pyroelectric behavior and dielectric constant tunability at microwave frequencies of novel lead-free ferro-piezoelectric ceramics with composition (Bi0.5Na0.5)0.96Ba0.04TiO3, We show that these ceramics perform well as pyroelectric infrared detectors, with a sensitivity comparable to traditional lead-containing ceramics. For microwave tunable applications,...
Circuit breaker failure protection scheme is typically used in electric transmission system to provide backup protection against any fault occurring at any given time in case a circuit breaker fails to open following receiving a trip signal from system protection relays. An ideal breaker failure protection system should clear the fault by operating the least amount of contributing breakers, both locally...
In the context of an ARTES 5 ESTEC/ESA programme, EADS CASA Espacio (ECE) has performed a development able to meet and excel the demanding requirements for the telecommunications reflector antenna. The 2.4 m diameter deployable reflector manufactured and tested in the frame of the program is used as reference data for the paper. The crucial requirement for the large size deployable reflectors is often...
Aurivillius-type structure compounds are considered good candidates for piezoelectric materials at high temperature, due to their high ferro-paraelectric phase transition temperature. Despite this fact, very few papers have been published on the study of piezoelectric properties at the expected working temperatures. An iterative automatic method has been used in this work to characterize the piezoelectric,...
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