Electrical properties, EPR analyses and defect chemistry of Mn-doped 0.675PMN-0.325PT piezoceramics
Berksoy-Yavuz, Ayse and Mensur-Alkoy, Ebru and Erdem, Emre and Alkoy, Sedat (2020) Electrical properties, EPR analyses and defect chemistry of Mn-doped 0.675PMN-0.325PT piezoceramics. Ceramics International, 46 (issue 18 part A). pp. 28980-28986. ISSN 0272-8842 (Print) 1873-3956 (Online)
Official URL: http://dx.doi.org/10.1016/j.ceramint.2020.08.069
The morphotropic phase boundary solid solution of 0.675Pb(Mg1/3Nb2/3)O-3 -0.325PbTiO(3) (0.675PMN-0.325PT) were studied. Manganese (Mn) was used as a dopant element in 0.4 mol% and 0.7 mol% ratios because of its multiple oxidation states. Sintering was done either in the air or under an oxygen-rich atmosphere. Both the effect of doping and sintering atmosphere on the electrical properties were reported. The ceramic with 0.4 mol% were exhibited higher properties such as piezoelectric charge coefficient (d(33)), dielectric constant, polarization values compared to undoped and 0.7 mol% Mn-doped ceramics. Electron paramagnetic resonance (EPR) spectroscopy was used to resolve the oxidation state of Mn in the 0.675PMN-0.325PT structure. The electrical properties were discussed and explained using defect chemistry.
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