X-ray diffraction, dielectric, conduction and Raman studies in Na{sub 0.925}Bi{sub 0.075}Nb{sub 0.925}Mn{sub 0.075}O{sub 3} ceramic

Journal Article · Wed Feb 15 04:00:00 EST 2012 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3684961· OSTI ID:22038865

Chaker, Chiheb ^[1]; Gagou, Y; Dellis, J -L; El Marssi, M ^[2]; Abdelmoula, N; Khemakhem, H ^[1]; Masquelier, C ^[3]

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1. Laboratoire des Materiaux Ferroelectriques (LMF), Unite de Recherche Physique-Mathematiques 05UR15-04, Universite de Sfax, Faculte des Sciences de Sfax, Route de Soukra km 3,5 - B.P.1171, 3000 Sfax (Tunisia)
2. Laboratoire de Physique de la Matiere Condensee (LPMC), Universite de Picardie Jules Verne, Pole Scientifique, 33 rue Saint-Leu, 80039 Amiens Cedex 1 (France)
3. Laboratoire de Reactivite et Chimie des Solides (LRCS), UMR 6007, Universite de Picardie Jules Verne, Pole Scientifique, 33 rue Saint-Leu, 80039 Amiens Cedex 1 (France)

Ceramic with composition Na{sub 0.925}Bi{sub 0.075}Nb{sub 0.925}Mn{sub 0.075}O{sub 3} (NNBM0075) was synthesized by high temperature solid state reaction technique. It was studied using X-ray diffraction (XRD), dielectric measurements and Raman spectroscopy. The sample crystallizes in orthorhombic perovskite structure with space group Pbma at room temperature. Dielectric properties of the ceramic was investigated in a broad range of temperatures (-150 to 450 deg. C) and frequencies (0.1-10{sup 3} kHz), and show two different anomalies connected to the symmetry change and electrical conductivity. Dielectric frequency dispersion phenomena in the NNBM0075 ceramic was analyzed by impedance spectroscopy in the temperature range from 55 to 425 deg. C. The Cole-Cole analysis based on electrical circuit and least square method was used to characterize the conduction phenomenon. A separation of the grain and grain boundary properties was achieved using an equivalent circuit model. The different parameters of this circuit were determined using impedance studies. Four conduction ranges, with different activation energies, were determined using the Arrhenius model. Raman spectra were studied as a function of temperatures and confirmed the X-ray and dielectric results. This composition is of interest for applications due to his physical properties and environmentally friendly character.

• OSTI ID: 22038865
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 4 Vol. 111; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
APPROXIMATIONS
BISMUTH COMPOUNDS
CERAMICS
CRYSTALLIZATION
DIELECTRIC MATERIALS
ELECTRIC CONDUCTIVITY
GRAIN BOUNDARIES
IMPEDANCE
KHZ RANGE
LEAST SQUARE FIT
MANGANATES
NIOBIUM COMPOUNDS
ORTHORHOMBIC LATTICES
PERMITTIVITY
RAMAN SPECTRA
RAMAN SPECTROSCOPY
SODIUM COMPOUNDS
TEMPERATURE DEPENDENCE
X-RAY DIFFRACTION