Joanny Fernandes | Universidade Estadual do Piauí (original) (raw)
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Papers by Joanny Fernandes
Review of Scientific Instruments, 2002
An optical fiber interferometer for measuring the d33 coefficient of piezoelectric samples is des... more An optical fiber interferometer for measuring the d33 coefficient of piezoelectric samples is described. Its configuration is based on the Mach-Zehnder interferometer, and a double incidence on the thin-film samples successfully suppresses the undesirable bending effect of the substrate. Detection of the small displacement is based on an active homodyne scheme. Results are reported for a bulk piezoelectric transducer (PZT) sample and a PZT thin-film incorporated in a microactuator.
European Physical Journal-applied Physics, 2003
Applied Surface Science, 2005
Journal of The European Ceramic Society, 2003
Thin films of bioactive glass-ceramics have been deposited on titanium and silicon substrates by ... more Thin films of bioactive glass-ceramics have been deposited on titanium and silicon substrates by RF magnetron sputtering. The crystalline phases and the microstructure of the films have been characterized using XRD and SEM analysis; the main phases present were calcium–magnesium phosphates, enstatite and forsterite. The adhesion of the films on titanium has been examined by pull-off testing; the adhesion strength for as-deposited films was around 40 MPa, but after crystallization the strength dropped to about half this value due to the presence of cracks. Samples kept in simulated body fluid showed an apatite-like layer, suggesting that the films are bioactive.
Review of Scientific Instruments, 2002
An optical fiber interferometer for measuring the d33 coefficient of piezoelectric samples is des... more An optical fiber interferometer for measuring the d33 coefficient of piezoelectric samples is described. Its configuration is based on the Mach-Zehnder interferometer, and a double incidence on the thin-film samples successfully suppresses the undesirable bending effect of the substrate. Detection of the small displacement is based on an active homodyne scheme. Results are reported for a bulk piezoelectric transducer (PZT) sample and a PZT thin-film incorporated in a microactuator.
European Physical Journal-applied Physics, 2003
Applied Surface Science, 2005
Journal of The European Ceramic Society, 2003
Thin films of bioactive glass-ceramics have been deposited on titanium and silicon substrates by ... more Thin films of bioactive glass-ceramics have been deposited on titanium and silicon substrates by RF magnetron sputtering. The crystalline phases and the microstructure of the films have been characterized using XRD and SEM analysis; the main phases present were calcium–magnesium phosphates, enstatite and forsterite. The adhesion of the films on titanium has been examined by pull-off testing; the adhesion strength for as-deposited films was around 40 MPa, but after crystallization the strength dropped to about half this value due to the presence of cracks. Samples kept in simulated body fluid showed an apatite-like layer, suggesting that the films are bioactive.