Frequency and thermal studies of dielectric permittivity and Raman analysis of Ba 0.97 La 0.02 Ti 0.98 Nb 0.016 O 3
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Frequency and thermal studies of dielectric permittivity and Raman analysis of Ba0.97La0.02Ti0.98Nb0.016O3 M. Jebli1,* , Ch. Rayssi1, N. Abdelmoula2, J. Dhahri1, Hafedh Belmabrouk3, and Hussein Alrobei4 1
Laboratoire de la Matière Condensée et des Nanosciences, Département de Physique, Université de Monastir, Faculté des Sciences de Monastir, Avenue de l’environnement, 5019 Monastir, Tunisia 2 Laboratoire des Matériaux Ferroélectriques (LMF), LR-Physique-Mathématiques et Applications, Université de Sfax, Faculté des Sciences (FSS), Route de Soukra km 3.5 B.P 1171, 3000 Sfax, Tunisie 3 Department of Physics, College of Science Al-Zulfi, Majmaah University, Al Majmaah, Saudi Arabia 4 Department of Mechanical Engineering, college of engineering, Prince Sattam bin Abdullaziz University, Alkharj, Saudi Arabia
Received: 14 August 2020
ABSTRACT
Accepted: 21 October 2020
The dielectric properties of polycrystalline ceramic Ba0.97La0.02Ti0.98Nb0.016O3 (BLTi0.98Nb0.016), elaborated by a molten-salt reaction, were methodically characterized. Phase purity, structure and crystallinity were examined with X-ray diffraction at room temperature, demonstrating pure phase with tetragonal symmetries and a P4/mmm space group for our sample. The frequency and temperature dependence of the dielectric properties showed an excellent response. The real part of permittivity and dielectric tangent decreased with increasing frequency. This can be clarified by Maxwell-Wagner type of polarization as per with Koop’s theory. The temperature dependence of the dielectric properties was examined in the frequency range 1 kHz to 1 MHz. Mostly, these three regions of dielectric relaxations are begun from phase transitions beginning: a cubic-paraelectric to a tetragonal-ferroelectric ‘‘C’’ (at the Curie temperature Tc), after that to an orthorhombic-ferroelectric ‘‘T ? O’’ (at TT ? O), and lastly to a rhombohedral-ferroelectric ‘‘O ? R’’ (at TO ? R) resembling to those of pure Barium titanate (BaTiO3, BT). To clarify the dielectric phenomenon, the Curie-Weiss law is investigated. This method is used to describe the ferro– paraelectric transition. The degree of disorder of the Ba0.97La0.02Ti0.98Nb0.016O3 was assessing via the modified Curie-Weiss law. The Raman spectrum was measured at room-temperature, and their variation related to the chemical composition, which affirmed the tetragonal structure for Ba0.97La0.02Ti0.98Nb0.016O3.
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https://doi.org/10.1007/s10854-020-04734-4
J Mater Sci: Mater Electron
1 Introduction Barium titanate (BaTiO3, BT), the prototype ferroelectric perovskite with the chemical formula ABO3, is one of the mainly studied materials owing to his interest dielectric and ferro/pyro/piezoelectric properties for applications in microelectronics, infrared identifiers, multilayer capacitors, memory cells, electro-optic components, PC recollections, pyroelectric indicators, multilayer ceramics capacitors
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