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RESEARCH PRODUCT
Detection of morphotropic phase boundary in A-site/Ca-substituted Na0.5Bi0.5TiO3 complex oxides ferroelectric system
Jimmy RomanosDenis ChaumontSara Abou DarghamRoy Roukossubject
DiffractionPhase boundaryPhase transitionMaterials scienceMechanical EngineeringMetals and AlloysAnalytical chemistry02 engineering and technology010402 general chemistry021001 nanoscience & nanotechnology01 natural sciencesFerroelectricity0104 chemical sciencessymbols.namesakeMechanics of MaterialsPhase (matter)Materials Chemistrysymbols[CHIM]Chemical SciencesOrthorhombic crystal system0210 nano-technologyRaman spectroscopySolid solutiondescription
Abstract Vibrational and structural properties of lead-free piezoelectric (1-x)Na0.5Bi0.5TiO3–xCaTiO3 (0 ≤ x ≤ 1.00) solid solutions have been investigated using Raman spectroscopy and X-ray diffraction. Different anomalies were detected and analyzed taking into consideration the phase transition from rhombohedral to orthorhombic phase at room temperature. All Raman bands were interpreted through the variation in the peak positions (frequency) and the corresponding half-widths at half maximum (HWHM) as a function of x. XRD used as a complementary technique to Raman spectroscopy, showed that the rhombohedral – orthorhombic phase transition went gradually through an intermediate phase consisting of a mixture of rhombohedral (R3c) and orthorhombic (Pnma) structures and that the fraction of orthorhombic phase increased with CT composition. The results show that the morphotropic phase boundary (MPB) is located between 0.09 and 0.15.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2020-11-05 |