6533b862fe1ef96bd12c6304

RESEARCH PRODUCT

Quantification of relaxor behavior in (1 − x)Na0.5Bi0.5TiO3 – xCaTiO3 lead-free ceramics system

Jimmy RomanosDenis ChaumontSara Abou DarghamRoy Roukos

subject

010302 applied physicsWork (thermodynamics)Maximum temperatureMaterials scienceThermodynamics02 engineering and technologyAtmospheric temperature range021001 nanoscience & nanotechnology01 natural sciencesFerroelectricitysymbols.namesakevisual_artPhase (matter)0103 physical sciencesDispersion (optics)Materials ChemistryCeramics and Compositesvisual_art.visual_art_mediumsymbols[CHIM]Chemical SciencesCeramic0210 nano-technologyRaman spectroscopy

description

Abstract This work examines the relaxor behavior of lead-free ceramic (1 − x)Na0.5Bi0.5TiO3–xCaTiO3 systems. A stable rhombohedral (R3c) phase is detected at room temperature for all compositions by XRD and Raman spectroscopy. Relaxor behavior was observed in the temperature range 300 K - 400 K for all materials. Ceramics exhibit normal ferroelectric properties at room temperature, and then they develop relaxor characteristics with increasing temperature showing the same dispersive properties. This work quantifies the relaxor phenomenon at low temperature. For instance, the maximum temperature of relaxor and the order of dispersion were determined at the strongest dispersion. Finally, the substitution by low CT concentration unaltered the relaxor behavior at low temperature.

yearjournalcountryeditionlanguage
2019-07-31Journal of the European Ceramic Society
https://doi.org/10.1016/j.jeurceramsoc.2019.02.015