Journalartikel
Autorenliste: Riaz, Abdullah; Witte, Kerstin; Bodnar, Wiktor; Hantusch, Martin; Schell, Norbert; Springer, Armin; Burkel, Eberhard
Jahr der Veröffentlichung: 2021
Zeitschrift: Materialia
Bandnummer: 15
ISSN: 2589-1529
DOI Link: https://doi.org/10.1016/j.mtla.2021.100998
Verlag: Elsevier
Abstract:
The polycrystalline perovskite calcium titanate has an orthorhombic crystal structure at room temperature, which belongs to a centro-symmetric point group. Due to this fact, it does not show piezoelectric behaviour. However, such behaviour is observed in nanostructured calcium titanate prepared by sol-gel synthesis and field assisted sintering. Whereas, the conventionally sintered sample does not show this behaviour. Presumably, the instability of regular TiO6 octahedra results in the off-centering of titanium positions of the field assisted sintered calcium titanate. This phenomenon leads to the generation of electric dipoles due to the lattice distortions produced by the formation of highly localized defects, i.e. oxygen vacancies, during densification by the field assisted sintering. As a result, pseudo-piezoelectric behaviour is observed, which confirms that the field assisted sintering triggers the piezoelectric effect but not the conventional sintering. The charge (Q) produced in the field assisted sintered sample and the piezoelectric constant (d(33)*) values have been determined to be Q = (2.1 +/- 0.3) pC and d(33+)* similar to(7.13 +/- 0.4) pm/V or d(33-)* similar to (-5.95 +/- 0.3) pm/V, respectively. This particular response of nanostructured calcium titanate is of great interest in biomedicine because it can improve the osseointegration of an implant.
Zitierstile
Harvard-Zitierstil: Riaz, A., Witte, K., Bodnar, W., Hantusch, M., Schell, N., Springer, A., et al. (2021) Structural changes and pseudo-piezoelectric behaviour of field assisted sintered calcium titanate, MATERIALIA, 15, Article 100998. https://doi.org/10.1016/j.mtla.2021.100998
APA-Zitierstil: Riaz, A., Witte, K., Bodnar, W., Hantusch, M., Schell, N., Springer, A., & Burkel, E. (2021). Structural changes and pseudo-piezoelectric behaviour of field assisted sintered calcium titanate. MATERIALIA. 15, Article 100998. https://doi.org/10.1016/j.mtla.2021.100998
Schlagwörter
BIOMATERIALS; Calcium titanate (CaTiO3); CATIO3; DENSIFICATION; distorted structure; FAST sintering; OXYGEN VACANCIES; Piezoelectric effect; SCIENCE BEAMLINE HEMS
