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      Idiosyncratic behaviour of (Na 0.495K 0.455Li 0.05)(Nb 0.95Ta 0.05)O 3–La 2O 3 ceramics: Synergistically improved thermal stability, ageing, and fatigue properties

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          Abstract

          La 2O 3 doped (Na 0.495K 0.455Li 0.05)(Nb 0.95Ta 0.05)O 3 ceramics are prepared using modified milling process, and the influences of La 2O 3 on ferroelectric behaviour, ageing characteristics, thermal stability, electrical stability, crystal structure, microstructure, dielectric and piezoelectric properties were reported. La 2O 3 addition improved the ferroelectric characteristic substantially, and obtained remnant polarization ( P r) and maximum strain ( S max) around 34.3 C/cm 2 and 0.13% respectively. La 2O 3 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 ( d 33) and electromechanical coupling factor ( k p) respectively in La 2O 3 doped samples (0.02 wt%), which also exhibited the lowest ageing rate and stable electrical fatigue behaviour.

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          Author and article information

          Journal
          J Adv Ceram
          Journal of Advanced Ceramics
          Tsinghua University Press and Springer-Verlag Berlin Heidelberg (USA )
          2227-8508
          2226-4108
          01 March 2019
          01 October 2019
          : 8
          : 1
          : 79-89
          Affiliations
          aArmament Research and Development Establishment, Pune-21, India
          bDepartment of Materials Engineering, Defence Institute of Advanced Technology, Pune-25, India
          Author notes
          *Corresponding authors: B. Praveenkumar, E-mail: praveen0406@ 123456gmail.com ; H. S. Panda, E-mail: himanshusp@ 123456diat.ac.in , hspanda3@ 123456gmail.com
          Article
          s40145-018-0295-z
          10.1007/s40145-018-0295-z
          Copyright © The Author(s)

          This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. See https://creativecommons.org/licenses/by/4.0/.

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