Idiosyncratic behaviour of (Na0.495K0.455Li0.05)(Nb0.95Ta0.05)O3–La2O3 ceramics: Synergistically improved thermal stability, ageing, and fatigue properties
- 29 Downloads
La2O3 doped (Na0.495K0.455Li0.05)(Nb0.95Ta0.05)O3 ceramics are prepared using modified milling process, and the influences of La2O3 on ferroelectric behaviour, ageing characteristics, thermal stability, electrical stability, crystal structure, microstructure, dielectric and piezoelectric properties were reported. La2O3 addition improved the ferroelectric characteristic substantially, and obtained remnant polarization (Pr) and maximum strain (Smax) around 34.3 C/cm2 and 0.13% respectively. La2O3 doped ceramics improved the thermal stability and were stable up to 180 °C compared to undoped ceramics (120 °C). The Rietveld refinement along with the high-temperature X-ray diffraction studies suggested the presence of monoclinic phase in La doped compositions, which is responsible for their idiosyncratic behaviour. The maximum values were obtained around 179 pC/N and 0.385 for piezoelectric constant (d33) and electromechanical coupling factor (kp) respectively in La2O3 doped samples (0.02 wt%), which also exhibited the lowest ageing rate and stable electrical fatigue behaviour.
Keywordsdielectric fatigue piezoelectric thermal stability
- Shen Z-Y, Xu Y, Li J-F. Enhancement of Qm in CuO-doped compositionally optimized Li/Ta-modified (Na,K)NbO3 lead-free piezoceramics. Ceram Int 2012, 38: S331–S334.Google Scholar
- Shannon RD. R evised effective ionic radii and systematic studies of interatomic distances in halides and chaleogenides. Acta Cryt 1976, A32: 751–767.Google Scholar
- Kreisel J, Glazer AM, Jones G, et al. An X-ray diffraction and Raman spectroscopy investigation of A-site substituted perovskite compounds: The (Na1−xKx)0.5Bi0.5TiO3 (0 ≤ x ≤ 1) solid solution. J Phys: Condens Matter 2000, 12: 3267–3280.Google Scholar
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made.
The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.
To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.