Abstract
The structural, microstructural, local ordering of B-site cations, dielectric and ferroelectric properties have been investigated for Pb1-xGdx(Mg1/3Nb2/3)1−x/4O3; 0 ≤ x ≤ 0.1. Charge imbalance due to Gd3+ ion substitution at Pb2+ is compensated by creating B-site vacancies. The Gd-ion doping at Pb sites in PMN results in the formation of a secondary GdNbO4 phase, which is explained by considering the ionic radii of the Gd ion and its solubility limit at Pb-ion sites. A reaction mechanism for the formation of GdNbO4 has been proposed. Selected area electron diffraction along the 〈110〉 axis reveals enhancement in size of the non-stoichiometric chemical ordered regions leading to a decrease in the size of polar nano regions and their correlations, which manifests in a decrease of Tm, a more diffused ϵmax peak and enhancement of the dielectric relaxation strength calculated from fitting of the frequency and temperature dependence of the dielectric behavior. Linear dependence between polarization and electric field also signifies reduction in the correlation between the PNRs resulting in the decrease of the value of Pmax (at ∼ 30 kV cm−1).
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
