Regular Article

Analysis of complex impedance spectroscopy, modulus and dielectric properties of the 0.65PbMg_1/3Nb_2/3O₃–0.35PbTiO₃ perovskite single crystals

¹ Laboratory of Materials, Energy and Environment Laboratory (LaMEE), Cadi Ayyad University, Faculty of Sciences Semlalia, Marrakech, Morocco
² Molecular Chemistry Laboratory, Coordination Chemistry and Catalysis Unit, Cadi Ayyad University, Faculty of Sciences Semlalia, Marrakech, Morocco
³ Laboratory of Materials, Processes, Environment and Quality, National School of Applied Sciences, Cadi Ayyad University, Safi, Morocco
⁴ Laboratory of Innovation in Science, Technology and Modeling (LISTM), Faculty of Science, Chouaib Doukkali University, El Jadida, Morocco
⁵ Universidad de Valladolid, Grupo de Energía, Economía y Dinámica de Sistemas (GEEDS), Valladolid, Spain
⁶ Moulay Ismail University, Faculty of Science, Laboratory Spectrometry of Materials and Archaeomaterials (LASMAR), Meknes, Morocco
⁷ Chouaib Doukkali University, Faculty of Sciences, Laboratory of Nuclear, Atomic and Molecular Physics and Techniques, El Jadida, Morocco
⁸ Theoretical Physics Team, L.P.M.C Laboratory, Faculty of Sciences, Chouaib Doukkali University, BP 20, El Jadida 24000, Morocco

^* e-mail: hnawi.salma@gmail.com

Received: 12 January 2023
Received in final form: 7 February 2023
Accepted: 9 March 2023
Published online: 17 April 2023

Abstract

The advancements complex dielectric and impedance properties studies are carried out on relaxor-ferroelectric single crystals such as PMN-PT (lead titanium-lead magnesium niobate) have gained significant interest for their outstanding properties. Three (1–x) PMN–xPT compositions were employed, where x = 0.35, which corresponds to the composition of the morphotropic phase boundary under normal ferroelectric behavior. An investigation of the dielectric behavior has been done for the three compositions. By examining the polarization evolution for several samples as a function of the applied field and temperature fluctuation, ferroelectric character was analyzed. The influence of temperature has a significant impact on the hysteresis loop. Impedance and complex modulus plots show two despondent semicircles and one flatten semicircle, respectively for (1–x) PMN–xPT. This is ascribed to the nearly same grain boundaries, capacitance of grain and higher grain boundary resistance than the grain resistance for (1–x) PMN–xPT. While the nature of Nyquist plot corroborates the attendance of bulk effects.