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Ferroelectric properties and phase transitions of high performance vertically aligned KNN nanowire-arrays grown by pulsed laser deposition

2020; Elsevier BV; Volume: 123; Linguagem: Inglês

10.1016/j.physe.2020.114143

1873-1759

Elsa Liliana Aguirre Benítez, R. Castañeda-Guzmán, Rigoberto López-Juárez, Osmary Depablos‐Rivera, J. J. Gervacio-Arciniega,

Advanced Sensor and Energy Harvesting Materials

Pulsed laser deposition (PLD) was used to synthesize piezoelectric nanowire-arrays of K0·5Na0·5NbO3 (KNN) on Pt/TiO2/SiO2/Si substrates. These arrays were successfully prepared by using two different deposition conditions than the previously reported for KNN. KNN with orthorhombic structure and minority secondary phases were identified by XRD. Ferroelectric and Piezoelectric properties were confirmed by piezoresponse force microscopy, and showed that nanowire-arrays have an improvement in their effective piezoelectric coefficient of d33eff = 94.6 p.m./V and 133.6 p.m./V, higher than previously reported coefficients. Pulsed laser photoacoustic technique was used to analyze the phase transition temperatures and they showed a phase transition (O-T) at ~170 °C and a phase transition (T-C) at ~360 °C, lower temperatures than those found for bulk ceramics. Furthermore, it was identified the presence of minor amount of secondary ferroelectric phase (K4Nb6O17).