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Phase field simulations in miscibility gaps
Maria Helena Sousa Soares de Oliveira Braga; Joana Cassilda Rodrigues Espain de Oliveira; Luís Filipe Malheiros de Freitas Ferreira; J. A. FerreiraUsing phase field simulations, it is possible to simulate the dynamics and morphology of immiscible liquids/solids appearing at the miscibility gap of any system. These simulations may also be used to determine the asymptotic compositions of the fluids for a given Gibbs energy. Even more, it is known that different parameters of the excess Gibbs energy of a certain phase may exhibit different asymptotic morphol...
Thermodynamic assessment of the Bi–Sn–Zn System
J. Vizdal; Maria Helena Sousa Soares de Oliveira Braga; A. Kroupa; K. Richter; Delfim Soares; Luís Filipe Malheiros de Freitas Ferreira; J. FerreiraA thermodynamic assessment of the Bi–Sn–Zn ternary system was carried out using the CALPHAD approach along with thermodynamic descriptions from new assessments of the Bi–Sn and Bi–Zn systems. Selected experimental data from the literature and our own work were also used. New sets of optimized thermodynamic parameters were obtained that lead to a very good fit between the calculated and e...
The behaviour of the lattice parameters in the Bi-Sn-Zn system
Maria Helena Sousa Soares de Oliveira Braga; J. Ferreira; Luís Filipe Malheiros de Freitas FerreiraLattice parameters, coefficients of thermal expansion and mass density were determined by means of X-ray powder diffraction between 30 and 180 ºC (or 240 ºC - depending on samples' composition). Rietveld refinement was performed in order to obtain phases' lattice parameters at each temperature. The Panalytical X´Pert Pro MPD was used for room temperature X-ray diffraction experiments (RTXRD) with bulk sam...
The experimental study of the Bi-Sn, Bi-Zn and Bi-Sn-Zn systems
Maria Helena Sousa Soares de Oliveira Braga; J. Vizdal; A. Kroupa; Delfim Soares; J. Ferreira; Luís Filipe Malheiros de Freitas FerreiraThe binary BiSn was studied by means of SEM (Scanning Electron Microscopy)/EDS (Energy-Dispersive solid state Spectrometry), DTA(Differential Thermal Analysis)/DSC (Differential Scanning Calorimetry) and RT-XRD (Room Temperature X-Ray Diffraction) in order to clarifydiscrepancies concerning the Bi reported solubility in (Sn). It was found that (Sn) dissolves approximately 10 wt% of Bi at the eutectic temperatur...
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