Polarization-switching dynamics in bulk ferroelectrics with isometric and oriented anisometric pores

Khachaturyan, Ruben; Zhukov, Sergey; Schultheiß, Jan; Galassi, Carmen; Reimuth, Christoph; Koruza, Jurij; Seggern, Heinz von; Genenko, Yuri A.

doi:10.1088/1361-6463/aa519c

Cited by 34 publications

(39 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similarly, the coercive field was also found to increase with porosity from a value of 1.02 kV mm À1 for PZT0 to 1.09 kV mm À1 for PZT30. This corresponds well to previous reports [29,30] and is related to the reduction in the electric field in the ceramic due to the presence of lower dielectric pores (air). It should be noted that the electric field distribution is dependent on the pore shape and their orientation to the applied electric field direction.…”

Section: Resultssupporting

confidence: 93%

Temperature‐ and Stress‐Dependent Electromechanical Response of Porous Pb(Zr,Ti)O₃

et al. 2020

View full text Add to dashboard Cite

The small‐signal direct piezoelectric coefficient and dielectric permittivity are characterized as a function of temperature from 25 to 450 °C and uniaxial compressive stress up to 80 MPa in porous Pb(Zr,Ti)O3 (PZT; 10, 20, 30, 40, and 50 vol% porosity). Results show retention of piezoelectric response throughout the temperature range with increasing porosity up to 30 vol%, above which a subsequent decrease is observed. Similarly, increasing porosity did not result in a significant change of the depolarization temperature, although a slight increase in the Curie point is observed with increasing porosity. Macroscopic experimental results are discussed together with microcomputed tomography, which shows the 3D pore structure. These results are important for sensing applications that operate at elevated temperatures and apply compressive stress to the electroactive element.

show abstract

Section: Resultssupporting

confidence: 93%

Temperature‐ and Stress‐Dependent Electromechanical Response of Porous Pb(Zr,Ti)O₃

et al. 2020

View full text Add to dashboard Cite

show abstract

“…P max is reduced by 10% and S max is reduced by 30% with increasing the creep strain. Note that cavitations present in the largely plastically deformed samples can lead to a reduction of the local electric field in the bulk, as previously demonstrated for piezoceramics with anisometric pores . As a consequence also the electromechanical strain and polarization are reduced; however, this effect seems to be rather small.…”

Section: Resultssupporting

confidence: 59%

“…Note that cavitations present in the largely plastically deformed samples can lead to a reduction of the local electric field in the bulk, as previously demonstrated for piezoceramics with anisometric pores. 59 As a consequence also the electromechanical strain and polarization are reduced; however, this effect seems to be rather small. ′ RT first increases with increasing creep strain and then slightly decreases, with a maximum value for the 0.6% deformed sample (C-1050°C-15 min).…”

Section: Creep-induced Changes In the Microstructure Dielectric Amentioning

confidence: 99%

High temperature creep‐mediated functionality in polycrystalline barium titanate

et al. 2019

View full text Add to dashboard Cite

Dislocations in oxides can be described as charged line defects and means for one‐dimensional doping, which can tune electrical and thermal properties. Furthermore, theoretically it was shown that dislocations can pin ferroelectric domain walls. Broader application of this concept hinges on the development of a methodology to avail this approach to polycrystalline ceramics. To this end, we use different creep mechanisms as a method to introduce multidimensional defects and quantify structural changes. A deformation map for fine‐grained barium titanate is provided and the influences of the defects and creep regimes are correlated in this first study to modifications of electrical conductivity, dielectric, ferroelectric, and piezoelectric properties. A plastic deformation of 1.29% resulted in an increase in the Curie temperature by 5°C and a decrease in electromechanical strain by 30%, pointing toward electromechanical hardening by dislocations.

show abstract

“…In the case of composite materials made with inclusions with low permittivity such as air, the electric field tends to concentrate inside of these inclusions due to the lower values of permittivity [153]. Highly porous materials are therefore more difficult to polarize than dense ceramics due to the complex electric field distribution generated by the presence of inclusions [154]. In Galassi [155] the manufacturing of porous piezoelectric materials is reviewed for different manufacturingtechniques which are divided into two groups, dry and wet techniques.…”

Section: Modelling Of Porous Piezoelectric Materials and Potential Appmentioning

confidence: 99%

“…In Zhang et al [156] the impact of different pore forming agents in the microstructure and electrical properties of the porous PZT is studied. In Khachaturyan et al [154] the polarization-switch mechanism is studied. The electric field distribution is studied during the polarization, accounting for the porous shape and its orientation with respect to the porosity volume.…”

Section: Modelling Of Porous Piezoelectric Materials and Potential Appmentioning

confidence: 99%

Modelling of Porous Piezoelectric Material and Potential Applications to Vibration Energy Harvesting

Ayuso¹

View full text Add to dashboard Cite

Recently, the search of new materials with improved performance, such as higher strength, lower weight, fire resistance, less sensitive to fatigue,... has been fostered and driven by industries such as aerospace, energy, and nuclear. The development of composite materials has been an important step to achieve these goals since it allows the combination of different materials in order to improve the overall performance of the resulting composite. Composites, such as layered woven composites or mixtures, are already heavy used in industry. These composite materials are tailored to improve one or several specific properties, for example higher strength or lower weight. However, composite materials are able not only to improve the existing material properties but also to add new properties. Self-sensing capabilities have drawn significant attention recently due to the increasing requirements of safety and optimization. Self-sensing structures are able to provide information in real time about its current state. Often self-sensing systems are distributed in large structures which poses a problem for the energy supply. Piezoelectric materials have been studied in depth for energy harvesting Contents Abstract iii Declarations v Co-Authorship Statement vii Agradecimientos xvii Acknowledgements xix Motivation xxi Thesis Structure xxiii List of Symbols and Notation xxiv Agradecimientos En 1676, Sir Isaac Newton escribió en una carta dirigida a Robert Hooke: Si he visto más lejos es porque estoy sentado sobre los hombros de gigantes. Se refería a científicos que anteriores habían constituido los cimientos de su trabajo, por ejemplo, Nicolás Copérnico, Galileo Galilei, Johannes Kepler. En estas palabras, se encierra la sabiduría de que buena parte de nuestros logros se deben a los demás, a veces anteriores a nosotros, a veces coetáneos. En mi caso, mis padres, Germán y Paqui, han sido los gigantes que me han protegido y sobre los que he observado el mundo. Ellos me han proporcionado todo lo que he necesitado y todo lo que me ha ayudado a crecer como persona. Han sido mi ejemplo a seguir, en trabajo, ética, moral, comportamiento, etc. Y sus lecciones y consejos estarán siempre en mi memoria. Sólo tengo palabras de gratitud y agradecimiento, por todo lo que habéis hecho por mí y por mis hermanos. Ellos me han ayudado a comprender el mundo y me han dado armas para defenderme. A su lado, soy sólo un niño. Eternamente gracias. No puedo olvidar recordar a mi abuelo Germán, que siempre impulsó en mí el deseo de estudiar y progresar. Su capacidad de trabajo y dedicación a la familia han sido un ejemplo para todos. En estos días, su ausencia se hace aún más amarga. A mis hermanas, Irene e Inma, y hermano Fran, por su cariño. Vosotros sois los únicos motivos que necesito para volver a casa. Al resto de mi familia, mi abuela Irene, mi tío Pedro, mi tía Rosa, mi tía Irene, mi tío Mario, mis primos, Rosa, Ángela, Mario y Nerea. Por me han hecho sentirme parte de algo mayor y que merece la pena. También me gustaría agradecer a todos mis a...

show abstract

Polarization-switching dynamics in bulk ferroelectrics with isometric and oriented anisometric pores

Cited by 34 publications

References 43 publications

Temperature‐ and Stress‐Dependent Electromechanical Response of Porous Pb(Zr,Ti)O₃

Temperature‐ and Stress‐Dependent Electromechanical Response of Porous Pb(Zr,Ti)O₃

High temperature creep‐mediated functionality in polycrystalline barium titanate

Modelling of Porous Piezoelectric Material and Potential Applications to Vibration Energy Harvesting

Contact Info

Product

Resources

About

Polarization-switching dynamics in bulk ferroelectrics with isometric and oriented anisometric pores

Cited by 34 publications

References 43 publications

Temperature‐ and Stress‐Dependent Electromechanical Response of Porous Pb(Zr,Ti)O3

Temperature‐ and Stress‐Dependent Electromechanical Response of Porous Pb(Zr,Ti)O3

High temperature creep‐mediated functionality in polycrystalline barium titanate

Modelling of Porous Piezoelectric Material and Potential Applications to Vibration Energy Harvesting

Contact Info

Product

Resources

About

Temperature‐ and Stress‐Dependent Electromechanical Response of Porous Pb(Zr,Ti)O₃

Temperature‐ and Stress‐Dependent Electromechanical Response of Porous Pb(Zr,Ti)O₃