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Publisher DOI: 10.1016/j.jascer.2015.12.004
Title: Effect of La and Mn on the properties of alkaline niobate-based piezoelectric ceramics
Language: English
Authors: Mgbemere, Henry Ekene 
Schneider, Gerold A. 
Keywords: ferroelectrics;lead-free ceramics;(KxNa1−x)NbO3;dopants
Issue Date: 7-Jan-2016
Publisher: Elsevier
Source: Journal of Asian Ceramic Societies 1 (4): 97-101 (2016-03-01)
Journal or Series Name: Journal of Asian ceramic societies 
Abstract (english): Lead-free ferroelectric (K0.44Na0.52Li0.04)(Nb0.86Ta0.1Sb0.04)O3ceramics co-doped with different amounts of both La and Mn have been produced using solid-state synthesis method. The relative density values of the unmodified sample are between 92 and 96% and decreases to ~91% for the sample with 1 mol% of the co-doping. Bi-modal grain distribution is observed in the samples while the average grain size decreases with co-doping due to grain growth inhibition by pinning of the grain boundary movement. The diffraction patterns show a transformation from an orthorhombic phase to a pseudo-tetragonal phase with co-dopants addition. The Curie temperature and the tetragonal-orthorhombic transition temperatures are lowered from ~9000 at 330 °C without modification to ~4000 at temperatures below 250 °C with co-dopant addition. The dielectric loss values of the samples also decrease from ~0.4 to 0.05 for temperatures up to 250 °C with co-doping. The remnant polarisation Prof the samples decreases from ~8.55 kV/cm to ~6.57 kV/cm with co-dopant addition. The piezoelectric charge coefficient (d33), including the normalised strain values, also decrease from ~400 pm/V and 220 pC/N to 157 pm/V and 159 pC/N, respectively with co-dopants up to 1 mol%.
DOI: 10.15480/882.1863
ISSN: 2187-0764
Institute: Keramische Hochleistungswerkstoffe M-9 
Type: (wissenschaftlicher) Artikel
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