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@article{faucris.106261364,
abstract = {The ferroelectric, ferroelastic, piezoelectric, and dielectric properties of co-doped, soft-type Pb(Zr,Ti)O3 were measured from −150°C to 350 °C, highlighting the importance of temperature and defects on the electromechanical response. Small signal piezoelectric measurements revealed a linear increase with increasing temperatures below 0 °C, followed by a maximum at approximately 50 °C. The low temperature properties correspond well to observed changes in the large-field response during the application of an external electrical and mechanical field. The results illustrate the importance of understanding phase boundary effects in order to determine a useable temperature range and to tailor future lead free piezoelectric materials for cryogenic electromechanical applications.},
author = {Kaeswurm, Barbara and Schader, Florian and Webber, Kyle Grant},
doi = {10.1016/j.ceramint.2017.10.204},
faupublication = {yes},
journal = {Ceramics International},
keywords = {ferroelasticity; ferroelectricity; phase boundary; piezoelectricity},
pages = {2358-2363},
peerreviewed = {Yes},
title = {{Ferroelectric}, {Ferroelastic}, {Piezoelectric}, and {Dielectric} {Properties} of {Lead} {Zirconate} {Titanate} from –150°{C} to 350°{C}},
volume = {44},
year = {2018}
}
@article{faucris.119783884,
abstract = {The dielectric constant and the direct piezoelectric coefficient as well as the macroscopic ferroelastic behavior of co-doped Pb(Zr,Ti)O-3 were characterized from 25 to 350 A degrees C as a function of uniaxial compressive stress. Experimental results show a decrease in the small signal piezoelectric coefficient and the permittivity with stress, although there exists a uniaxial compressive stress that significantly reduces the variation of the piezoelectric coefficient with increasing temperature, making it a possible method for sensors that operate over a large temperature range. In the vicinity of the depolarization temperature, the piezoelectric response rapidly decreases. This temperature, however, was observed well below the temperature at maximum permittivity. Experimental results reveal that uniaxial compressive stress shifts the temperature at maximum permittivity, giving insight into the effect of stress on the phase transition behavior in Pb(Zr,Ti)O-3, but does not apparently influence the depolarization temperature.},
author = {Schader, Florian and Isaia, Daniel and Weber, Michael and Aulbach, Emil and Webber, Kyle Grant},
doi = {10.1007/s10853-017-1817-8},
faupublication = {yes},
journal = {Journal of Materials Science},
pages = {3296-3308},
peerreviewed = {Yes},
title = {{High}-temperature stress-dependent piezoelectric and dielectric coefficient of soft {Pb}({Zr},{Ti}){O}-3},
volume = {53},
year = {2018}
}
@article{faucris.209901769,
abstract = {The piezoelectric coefficient is a measure to quantify the potential use of a material in energy harvesting and sensor applications. High concentration of free charge carriers in piezoelectric materials can significantly impede the use of generated piezoelectric charge. In this study, undoped semiconducting ZnO single crystals with both Ohmic and Schottky contacts were prepared to quantify the effective piezoelectric response at temperatures from 20 degrees C to -140 degrees C and frequencies of mechanical loading from 0.5 Hz to 160 Hz. It was demonstrated that the formation of an electrostatic potential barrier at the metal-semiconductor interface increases the overall resistance, which provides access to unbiased piezoelectric coefficients of ZnO single crystals even at room temperature. These findings were verified using semiconducting ZnO for energy harvesting at room temperature and relatively low loading frequency. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.},
author = {Novak, Nikola and Keil, Peter and Froemling, Till and Schader, Florian and Martin, Alexander and Webber, Kyle Grant and Roedel, Juergen},
doi = {10.1016/j.actamat.2018.10.008},
faupublication = {yes},
journal = {Acta Materialia},
keywords = {Semiconductor;Piezoelectricity;Piezotronics;Energy harvesting},
month = {Jan},
pages = {277-283},
peerreviewed = {Yes},
title = {{Influence} of metal/semiconductor interface on attainable piezoelectric and energy harvesting properties of {ZnO}},
volume = {162},
year = {2019}
}
@article{faucris.120081764,
author = {Menge, Georg and Lorenz, Hannes and Fu, Zongwen and Eichhorn, Franziska and Schader, Florian and Webber, Kyle Grant and Fey, Tobias and Greil, Peter and Travitzky, Nahum},
doi = {10.1002/adem.201800052},
faupublication = {yes},
journal = {Advanced Engineering Materials},
keywords = {Microstructure; Multilayer BaTiO3; Piezoelectric properties; Preceramic paper},
peerreviewed = {unknown},
title = {{Paper}-{Derived} {Ferroelectric} {Ceramics}: {A} {Feasibility} {Study}},
year = {2018}
}
@article{faucris.122739144,
abstract = {There has been considerable progress in the development of large strain lead-free perovskite
ferroelectrics over the past decade. Under certain conditions, the electromechanical properties of some compositions now match or even surpass commercially available lead-containing materials over a wide temperature range, making them potentially attractive for non-resonant displacement applications. However, the phenomena responsible for the large unipolar strains and piezoelectric responses can be markedly different to classical ferroelectrics such as Pb(Zr,Ti)O3 and BaTiO3. Despite the promising electromechanical properties, there is little understanding of the mechanical properties and fracture behavior, which is crucial for their implementation into applications where they will be exposed to large electrical, mechanical, and thermal fields. This work discusses and reviews the current understanding of the mechanical behavior of large-strain perovskite lead-free ferroelectrics for use in actuators and provides recommendations for further work in this important field.},
author = {Webber, Kyle Grant and Voegler, Malte and Khansur, Neamul Hayet and Kaeswurm, Barbara and Daniels, John E. and Schader, Florian},
doi = {10.1088/1361-665X/aa590c},
faupublication = {yes},
journal = {Smart Materials and Structures},
keywords = {ferroelasticity; ferroelectricity; lead-free ferroelectrics; mechanical properties; relaxors},
peerreviewed = {Yes},
title = {{Review} of the mechanical and fracture behavior of perovskite lead-free ferroelectrics for actuator applications},
volume = {26},
year = {2017}
}