X-ray structure refinement of solid solution Ba2.15−xNa0.7+xNb5−xWxO15 and the investigation of the orthorhombic-tetragonal phase transition by Raman spectroscopy

Bensaid, H.; Bih, L.; Manoun, Bouchaib; Azrour, M.; Bouari, Abdeslam El; Lazor, Peter

doi:10.1016/j.molstruc.2010.12.043

Cited by 5 publications

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“…Dielectric experiments show that the ferroelectric niobate ceramic BNNW025 presents a phase & A. Neqali aziz.neqali@gmail.com 1 transition at T = 472°C. This result was confirmed by X-ray analysis and Raman studies in previous work [5]. The origin of frequency dispersion of dielectric constant was analyzed by complex impedance spectroscopy technique.…”

Section: Introductionsupporting

confidence: 79%

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Diffuse phase transition and impedance spectroscopy analysis of Ba2.15−x Na0.7+x Nb5−x W x O15 (x = 0.25) ferroelectric ceramic

Neqali

Belboukhari²,

Bensaid³

et al. 2016

Appl. Phys. A

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A new rare earth ferroelectric tetragonal tungsten bronze compound with general formula Ba 2.15-xNa 0.7?x Nb 5-x W x O 15 (x = 0.25) was elaborated as ceramic and investigated using X-ray diffraction and dielectric measurements. The results show a tetragonal phase with the space group P4bm. Special emphasis was done to characterize diffuse phase transition (DPT) that occurs close to 472°C. Using dielectric measurements in a frequency range of (10 Hz-1 MHz) and in a temperature range (25-550°C), we have shown that the real part of the permittivity close to DPT is well described by Santos-Eiras phenomenological model. Space charge polarization, relaxation phenomena and free charges conductivity have been analyzed using dielectric, impedance spectroscopy and Nyquist plots showed non-Debye (polydispersive) type relaxation. In paraelectric phase, the Arrhenius activation energies were determined. Frequency dependence of ac conductivity at different temperatures follows the Jonscher's universal law (Jonscher et al. in J Mater Sci 20:4431, 1985).

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Section: Introductionsupporting

confidence: 79%

“…3.1 X-ray diffraction (XRD) analysis Figure 1 shows the obtained room temperature XRD pattern on BNNW025 ceramic made in previous work [5]. This figure shows an excellent agreement between the calculated and the observed diffractograms.…”

Section: Resultsmentioning

confidence: 52%