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Ferroelectric/antiferroelectric phase coexistence in the intermediate concentra...
Lanceros-Méndez, S.; Mendes, J. A.; Köhler, M.; Schaack, G.Temperature and frequency dependent hysteresis loop measurements have been carried out along the phase diagram of ferroelectric (FE) betaine at-senate (BA) and antiferroelectric (AF) betaine phosphate (BP) mixed crystal system (BA(x)BP(1-x)). Coexistence regions characterized by competing ferro- and/or antiferroelectric interactions are detected by multiple hysteresis loops.
Chain reorientation in ß-PVDF films upon transverse mechanical deformation stud...
Barbosa, R.; Mendes, J. A.; Sencadas, V.; Mano, J. F.; Lanceros-Méndez, S.Chain reorientation may be induced in polyvinylidene fluoride (PVDF) in its ß-phase by applying a deformation perpendicular to the pre-oriented polymeric chains. This reorientation begins right after the yielding point and seems to be completed when the stress-strain curve stabilizes. We have studied the chain reorientation mechanism by scanning electron microscopy (SEM) and dielectric relaxation methods and we...
Physical and morphological characterization of reactively magnetron sputtered T...
Vaz, F.; Machado, P.; Rebouta, L.; Mendes, J. A.; Lanceros-Méndez, S.; Cunha, L.; Nascimento, Sérgio M. C.; Goudeau, Ph.; Rivière, J. P.; Alves, E.The present paper reports the influence of growth conditions on the properties of TiN thin films deposited by rf reactive magnetron sputtering in the low-pressure range. The effects of rf power at the Ti target and the negative bias voltage at the substrate in the morphology, structure, electrical resistivity and colour of the samples were studied in detail. X-Ray diffraction results showed that the delta-TiN p...
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