Idiosyncratic behaviour of (Na0.495K0.455Li0.05)(Nb0.95Ta0.05)O3-La2O3 ceramics: Synergistically improved thermal stability, ageing, and fatigue properties

Bhupender RAWAL; N. N. WATHORE; B. PRAVEENKUMAR; H. S. PANDA

doi:10.1007/s40145-018-0295-z

Journal of Advanced Ceramics 2019, 8(1): 79-89 https://doi.org/10.1007/s40145-018-0295-z

Research Article |

Open Access | Issue | Published: 13 March 2019

Idiosyncratic behaviour of (Na_0.495K_0.455Li_0.05)(Nb_0.95Ta_0.05)O₃-La₂O₃ ceramics: Synergistically improved thermal stability, ageing, and fatigue properties

Show Author's Information Hide Author's Information Bhupender RAWAL^{^a}, N. N. WATHORE^{^a}, B. PRAVEENKUMAR^{^a}(

), H. S. PANDA^{^b}(

)

a Armament Research and Development Establishment, Pune-21, India

b Department of Materials Engineering, Defence Institute of Advanced Technology, Pune-25, India

Keywords:

fatigue, dielectric, piezoelectric, thermal stability

Cite this article:

RAWAL B, WATHORE NN, PRAVEENKUMAR B, et al. Idiosyncratic behaviour of (Na_0.495K_0.455Li_0.05)(Nb_0.95Ta_0.05)O₃-La₂O₃ ceramics: Synergistically improved thermal stability, ageing, and fatigue properties. Journal of Advanced Ceramics, 2019, 8(1): 79-89. https://doi.org/10.1007/s40145-018-0295-z

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Abstract

La₂O₃ doped (Na_0.495K_0.455Li_0.05)(Nb_0.95Ta_0.05)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 (P_r) and maximum strain (S_max) around 34.3 C/cm² and 0.13% respectively. La₂O₃ doped ceramics improved the thermal stability and were stable up to 180 ℃ compared to undoped ceramics (120 ℃). 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 (k_p) respectively in La₂O₃ doped samples (0.02 wt%), which also exhibited the lowest ageing rate and stable electrical fatigue behaviour.

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Idiosyncratic behaviour of (Na_0.495K_0.455Li_0.05)(Nb_0.95Ta_0.05)O₃-La₂O₃ ceramics: Synergistically improved thermal stability, ageing, and fatigue properties

Show Author's information Hide Author's Information Bhupender RAWAL^{^a}, N. N. WATHORE^{^a}, B. PRAVEENKUMAR^{^a}(

), H. S. PANDA^{^b}(

)

a Armament Research and Development Establishment, Pune-21, India

b Department of Materials Engineering, Defence Institute of Advanced Technology, Pune-25, India

Abstract

Keywords: fatigue, dielectric, piezoelectric, thermal stability

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Received: 10 April 2018

Revised: 29 August 2018

Accepted: 31 August 2018

Published: 13 March 2019

Issue date: March 2019

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