Papers by Author: Fabrizio Leccabue

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Authors: Franca Albertini, Z. Arnold, J. Kamarád, Fabrizio Leccabue, L. Pareti, Bernard Enrico Watts
Authors: P. Marín, Manuel Vázquez, L. Pascual, D. Negri, Fabrizio Leccabue, B.E. Watts, Hywel A. Davies, Antonio Hernando
Authors: N. Murillo, Fabrizio Leccabue, B.E. Watts, P. Marín, M. Vázquez, J. González, José M. Barandiarán
Authors: S. Díaz-Castañón, J.L. Sánchez Ll., Fabrizio Leccabue, B.E. Watts, T. García, E. Deposada
Authors: J.S. Garitaonandia, Lara Righi, José M. Barandiarán, P. Gorría, Fabrizio Leccabue, B.E. Watts
Authors: N. Murillo, Fabrizio Leccabue, B.E. Watts, I. Telleria, J. González, José M. Barandiarán
Authors: Bernard Enrico Watts, Daniele Regonini, Fabrizio Leccabue, Francesca Casoli, Franca Albertini, Gabriele Bocelli, David S. Schmool
Abstract: M-type lead hexaferrites (PbFe12O19) have been prepared using sol-gel methods. Lead and iron precursors were dissolved in butoxyethanol and stabilised with acetylacetone to produce a sol with good wetting and surface coating characteristics. Powder samples were investigated to optimise conditions for the growth of thin films. The «spin on» technique was used to provide homogeneous films. X-ray diffraction and thermomagnetic analysis vibrating sample magnetometry have been performed to assess phase distribution and transformation. The results show that the hexaferrite phase can be crystallised above 700 °C and that for the first indication that this phase is metastable in air below 650 °C.
Authors: Nicola Delmonte, Bernard Enrico Watts, Fabrizio Leccabue, Paolo Cova, Giovanni Chiorboli
Abstract: In recent years several ferroelectric thin films have been studied at microwave frequencies; lead zirconate titanate (PZT) and barium-strontium titanate (BST) has been widely investigated. However, the microwave dielectric properties of strontium-bismuth tantalate (SBT) have not yet been investigated so widely [1]. The purpose of this work is the microwave characterization of the dielectric properties of an SBT thin film biased at different DC voltages. The dielectric properties of SBT make it a good material for the production of FERAM memories. Microwave characterizations may show other properties that could promote the SBT as good candidate for capacitors to be employed also in microwave circuits (e.g. resonators and filters). In this work a study of high frequency dielectric properties has been performed and equivalent circuit model has been used to correct the measurements.
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