Structure refinement, dielectric, pyroelectric and Raman characterizations of Ba{sub 1-x}La{sub x(1-y)/2}Eu{sub xy/2}Na{sub x/2}TiO{sub 3} solid solution

Journal Article · Fri Dec 15 00:00:00 EST 2006 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2006.09.006· OSTI ID:20900940

Abdelmoula, Najmeddine ^[1]; Khemakhem, Hamadi ^[1]; Simon, Annie ^[2]; Maglione, Mario ^[2]

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1. Laboratoire des Materiaux Ferroelectriques, Faculte des Sciences de Sfax, BP 802, 3018 Sfax (Tunisia)
2. Institut de Chimie de la Matiere Condensee de Bordeaux, ICMCB-CNRS Universite Bordeaux I, 87, Avenue du Dr. A. Schweitzer, 33608 Pessac (France)

The perovskite-type oxides Ba{sub 1-x}La{sub x(1-y)/2}Eu{sub xy/2}Na{sub x/2}TiO{sub 3} (0=<x=<0.5 and xy=0.04) were synthesized and characterized by X-ray diffraction as well as dielectric measurements and Raman spectroscopy. The crystal structure of these ceramics has been determined by the Rietveld refinement powder X-ray diffraction data at room temperature. These compounds crystallize at room temperature in tetragonal space group P4mm for 0=<x=<0.1 and in the cubic group Pm3-bar m for 0.2=<x=<0.5. The phase transition temperature T{sub C} (or T{sub m}) decreases as x content increases. The degree of diffuseness of the phase transition is more pronounced for higher x content, implying the existence of a composition-induced diffuse phase transition of the ceramics with x>=0.1. The evolution of the Raman spectra was studied as a function of various compositions at room temperature. The polarization state was checked by pyroelectric measurements.

• OSTI ID: 20900940
• Journal Information: Journal of Solid State Chemistry, Vol. 179, Issue 12; Other Information: DOI: 10.1016/j.jssc.2006.09.006; PII: S0022-4596(06)00514-7; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM COMPOUNDS
CERAMICS
CUBIC LATTICES
DIELECTRIC MATERIALS
EUROPIUM COMPOUNDS
LANTHANUM COMPOUNDS
PEROVSKITE
PHASE TRANSFORMATIONS
RAMAN SPECTRA
RAMAN SPECTROSCOPY
SODIUM COMPOUNDS
SOLID SOLUTIONS
SPACE GROUPS
TEMPERATURE RANGE 0273-0400 K
TETRAGONAL LATTICES
TITANATES
TRANSITION TEMPERATURE
X-RAY DIFFRACTION