TY  - CONF
AU  - Vijatović Petrović, Mirjana
AU  - Rusanescu Craciun, Floriana
AU  - Cordero, Francesco
AU  - MERCADELLI, ELISA
AU  - Galassi, Carmen
AU  - Ilić, Nikola
AU  - Bobić, Jelena
AU  - Brunengo, Elisabetta
AU  - Stagnaro, Paola
PY  - 2020
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2498
AB  - The growing interest in science community today is finding the ways to safely use mechanical energy which is
being released in small portions around us. The idea of this work is to use vibrational energy present everywhere
in small quantities to power the small-scale electronic devices used in everyday life. Flexible electronics,
which can be bent, rolled, and stretched into arbitrary shapes, would significantly expand the application of
modern electronic devices [1, 2].
As a lead-free piezoelectric material bismuth sodium titanate-barium titanate (BNBT) was selected and prepared
by a solid state reaction. Since, polymer polyvinylidene fluoride (PVDF) has interesting properties and advantages
over the other polymers, it was used as a matrix for the processing of polymer/ceramics flexible films by
hot pressing. Implementation of piezoelectric powder into the matrix of α- phase PVDF was performed under
the carefully optimized conditions of temperature and pressure. Three different volume rations of active phase
vs. polymer (BNBT 30, 35 and 40 vol%) were used for the preparation of flexible films. The homogeneous distribution
of piezoelectric powder in the polymer was obtained. IR analysis pointed that after the hot pressing,
in the obtained flexible films, there is a transformation of electrically inactive PVDF α-phase into electrically active
β and γ phases. Ferroelectric analysis evidenced the difficulties to obtain fully saturated hysteresis loops in
inhomogeneous ferroelectric materials due to the formation of charge layers at the ferroactive-polymer phase
interfaces. The dielectric permittivity for 40 vol% is nearly two times higher than for 30 vol% and eight times
higher than for pure PVDF, while the losses at room temperature (at 1 kHz) remain below 3 %. Anelastic measurements
confirmed the results obtained with the dielectric spectroscopy.
PB  - Electroceramics XVII 2020, Darmstadt, 24-28 August 2020, Online Conference
C3  - Electroceramics XVII 2020, Darmstadt, 24-28 August 2020, Online Conference
T1  - Lead-free piezoelectric flexible films
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2498
ER  - 

@conference{
author = "Vijatović Petrović, Mirjana and Rusanescu Craciun, Floriana and Cordero, Francesco and MERCADELLI, ELISA and Galassi, Carmen and Ilić, Nikola and Bobić, Jelena and Brunengo, Elisabetta and Stagnaro, Paola",
year = "2020",
abstract = "The growing interest in science community today is finding the ways to safely use mechanical energy which is
being released in small portions around us. The idea of this work is to use vibrational energy present everywhere
in small quantities to power the small-scale electronic devices used in everyday life. Flexible electronics,
which can be bent, rolled, and stretched into arbitrary shapes, would significantly expand the application of
modern electronic devices [1, 2].
As a lead-free piezoelectric material bismuth sodium titanate-barium titanate (BNBT) was selected and prepared
by a solid state reaction. Since, polymer polyvinylidene fluoride (PVDF) has interesting properties and advantages
over the other polymers, it was used as a matrix for the processing of polymer/ceramics flexible films by
hot pressing. Implementation of piezoelectric powder into the matrix of α- phase PVDF was performed under
the carefully optimized conditions of temperature and pressure. Three different volume rations of active phase
vs. polymer (BNBT 30, 35 and 40 vol%) were used for the preparation of flexible films. The homogeneous distribution
of piezoelectric powder in the polymer was obtained. IR analysis pointed that after the hot pressing,
in the obtained flexible films, there is a transformation of electrically inactive PVDF α-phase into electrically active
β and γ phases. Ferroelectric analysis evidenced the difficulties to obtain fully saturated hysteresis loops in
inhomogeneous ferroelectric materials due to the formation of charge layers at the ferroactive-polymer phase
interfaces. The dielectric permittivity for 40 vol% is nearly two times higher than for 30 vol% and eight times
higher than for pure PVDF, while the losses at room temperature (at 1 kHz) remain below 3 %. Anelastic measurements
confirmed the results obtained with the dielectric spectroscopy.",
publisher = "Electroceramics XVII 2020, Darmstadt, 24-28 August 2020, Online Conference",
journal = "Electroceramics XVII 2020, Darmstadt, 24-28 August 2020, Online Conference",
title = "Lead-free piezoelectric flexible films",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2498"
}

Vijatović Petrović, M., Rusanescu Craciun, F., Cordero, F., MERCADELLI, E., Galassi, C., Ilić, N., Bobić, J., Brunengo, E.,& Stagnaro, P.. (2020). Lead-free piezoelectric flexible films. in Electroceramics XVII 2020, Darmstadt, 24-28 August 2020, Online Conference
Electroceramics XVII 2020, Darmstadt, 24-28 August 2020, Online Conference..
https://hdl.handle.net/21.15107/rcub_rimsi_2498

Vijatović Petrović M, Rusanescu Craciun F, Cordero F, MERCADELLI E, Galassi C, Ilić N, Bobić J, Brunengo E, Stagnaro P. Lead-free piezoelectric flexible films. in Electroceramics XVII 2020, Darmstadt, 24-28 August 2020, Online Conference. 2020;.
https://hdl.handle.net/21.15107/rcub_rimsi_2498 .

Vijatović Petrović, Mirjana, Rusanescu Craciun, Floriana, Cordero, Francesco, MERCADELLI, ELISA, Galassi, Carmen, Ilić, Nikola, Bobić, Jelena, Brunengo, Elisabetta, Stagnaro, Paola, "Lead-free piezoelectric flexible films" in Electroceramics XVII 2020, Darmstadt, 24-28 August 2020, Online Conference (2020),
https://hdl.handle.net/21.15107/rcub_rimsi_2498 .