Enhancing the electrical properties of NBT ceramics by the addition of small amounts of Yb

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dc.creatorFrança, E. L. T.
dc.creatorRomanholo, Pedro Victor Valadares
dc.creatorSimões, Simone da Silva
dc.creatorFalcão, Eduardo Henrique Lago
dc.creatorFranco Júnior, Adolfo
dc.creatorMachado, Fernando Luis de Araújo
dc.date.accessioned2023-10-30T14:06:07Z
dc.date.available2023-10-30T14:06:07Z
dc.date.issued2021
dc.description.resumoIn the present work, the magnetic and electrical properties of ceramic samples of Na0.5Bi0.5−xYbxTiO3 with x = 0.005, 0.010, 0.015 and 0.020 prepared by a solid-state reaction were investigated. X-ray diffraction (XRD) patterns revealed that the addition of Yb3+ ions led to distortions in the rhombohedral perovskite structure. The microstructure morphology investigated by scanning electron microscopy revealed the presence of micro-pores, diminishing the overall mass density of the ceramics for increasing values of x. This behaviour is opposite to the one observed for the mass density determined by using the XRD data. Despite of the contraction in the lattice parameter, the<Ti–O>bond length was found to increase for increasing values of x, shifting the corresponding Raman modes towards lower values of energy. The magnetization and the ac and dc magnetic susceptibilities were measured from 300 K down to 5 K. The magnetic moment associated to the Yb3+ ions added a paramagnetic behavior to the NBT samples that increases for increasing values of x. The electrical permittivity was measured at room temperature by impedance spectroscopy for frequencies (f) in the range 20 Hz–2.0 GHz. The f-dependence for the permittivity was accounted for by using the Cole-Davidson model. It was observed that the addition of the Yb3+ ions enhances the values of the dielectric constants, yielding an increase of about 70% for x = 0.020, while the overall dielectric losses are significantly reduced.
dc.identifier.citationFRANÇA, E. L. T. et al. Enhancing the electrical properties of NBT ceramics by the addition of small amounts of Yb. Journal of Alloys and Compounds, Amsterdam, v. 873, e159845, 2021. DOI: 10.1016/j.jallcom.2021.159845. Disponível em: https://www.sciencedirect.com/science/article/pii/S0925838821012548. Acesso em: 4 set. 2023.
dc.identifier.doi10.1016/j.jallcom.2021.159845
dc.identifier.issn0925-8388
dc.identifier.issne- 1873-4669
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S0925838821012548
dc.language.isoeng
dc.publisher.countryHolanda
dc.publisher.departmentInstituto de Física - IF (RMG)
dc.rightsAcesso Restrito
dc.subjectNBT
dc.subjectMagnetic properties
dc.subjectElectrical properties
dc.titleEnhancing the electrical properties of NBT ceramics by the addition of small amounts of Yb
dc.typeArtigo

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