Publication
Niobium doping and dielectric anomalies in bismuth titanate
Publications associées (38)
Piezoelectric Properties of BiFeO3 Exposed to High Temperatures
Dragan Damjanovic, Xiaolong Li
BiFeO3 is a ferroelectric with a Curie temperature of 830 C-degrees, however, its piezoelectric performance at high temperature remains unclear. The current work reveals a disappearance/recovery of piezoelectricity in BiFeO3 at elevated temperature and upo ...
Weinheim2024Intrinsic switching in Si-doped HfO2: A study of Curie-Weiss law and its implications for negative capacitance field-effect transistor
Mihai Adrian Ionescu, Igor Stolichnov, Ali Saeidi, Teodor Rosca, Sadegh Kamaei Bahmaei, Eamon Patrick O'Connor, Matteo Cavalieri, Carlotta Gastaldi
HfO2-based ferroelectrics are considered a promising class of materials for logic and memory applications due to their CMOS compatibility and ferroelectric figures of merit. A steep-slope field-effect-transistor (FET) switch is a device for logic applicati ...
AMER INST PHYSICS2021Origins of the macroscopic symmetry breaking in centrosymmetric phases of perovskite oxides
Many perovskite materials experience a temperature-driven phase transition at the Curie temperature from a non-centrosymmetric polar ferroelectric phase to a paraelectric phase, where polarization is lost. The paraelectric phase is usually centrosymmetric ...
EPFL2017High diffusion barrier and piezoelectric nanocomposites based on polyvinylidene fluoride-trifluoroethylene copolymer and hydrophobized clay
Yves Leterrier, Dragan Damjanovic, Antonia Neels, Sara Dalle Vacche, Olha Sereda, Alex Dommann
Nanocomposites based on polyvinylidene fluoride– trifluoroethylene copolymer and up to 4 vol % of hydrophobized clay nanoparticles are investigated. The structure, piezoelectric properties, and oxygen permeability of solvent cast films are analyzed before ...
Wiley-Blackwell2017Piezoelectric enhancement under negative pressure
Nava Setter, Alexander Tagantsev, Tomas Sluka, Alexander Kvasov, Silviu Cosmin Sandu, Jin Wang
Enhancement of ferroelectric properties, both spontaneous polarization and Curie temperature under negative pressure had been predicted in the past from first principles and recently confirmed experimentally. In contrast, piezoelectric properties are expec ...
Nature Publishing Group2016In-situ structural investigations of ferroelasticity in soft and hard rhombohedral and tetragonal PZT
Despite the technological importance of hard and soft PZT, Pb(Zr,Ti)O3, ceramics, the mechanisms of ferroelectric hardening and softening remain widely discussed in the literature. The hardening and softening phenomena have traditionally been investigated ...
American Institute of Physics2015Breaking of the macroscopic centric symmetry in Ba₁₋xSrxTiO₃ ceramics and single crystals
Beyond the possibility of finding a lead-free piezoceramics as replacement for PZT, the world-wide research has focused on other mechanisms of electro-mechanical coupling alternative to piezoelectricity, such as electrostriction and, more recently, flexoel ...
EPFL2014Solid Solutions of Lead Metaniobate-Stabilization of the Ferroelectric Polymorph and the Effect on the Lattice Parameters, Dielectric, Ferroelectric, and Piezoelectric Properties
Nava Setter, Dragan Damjanovic, Alberto Biancoli, Barbara Maraston Fraygola, Mtabazi Geofrey Sahini
Ferroelectric orthorhombic lead metaniobate (PbNb2O6) is known to be metastable with respect to the thermodynamically stable nonferroelectric rhombohedral polymorph. The high-temperature tetragonal to low temperature rhombohedral phase transition is recons ...
Wiley-Blackwell2014Piezoceramic materials for high-temperature and high-pressure applications in oilfield exploration and production
This work was originally motivated by the search for high-temperature piezoceramic materials with low acoustic impedance and high electromechanical coupling. The temperature and pressure behavior of two PZT-based materials with engineered porosity, Pz31 & ...
IEEE2013New In-Pd mechanical loss peak in ternary gold alloys
Daniele Mari, Robert Schaller, Iva Tkalcec Vâju
A point defect relaxation peak has been observed in a ternary 18-carat gold alloy with the composition Au62.5Pd32.5In5. It shows a Curie Weiss dependence on the temperature, as is commonly observed for a Zener peak. However, the peak is absent in the binar ...
Pergamon-Elsevier Science Ltd2013