Paulo Sergio Pizani

• Abstract

  The resources requested in the present project will be used basically to improve the infra structure of the Physics Department Raman Laboratory concerning to synthesis and optical characterization of materials to be submitted to high hydrostatic pressures. The synthesis technique used will be mechanical alloying through which is possible to activate the solid state reaction by reducing th…

  Mechanical alloying of rare earth- and transition elements- doped ABO3 type materials: particle size and hydrostatic pressure effects on the optical, structural and dynamical properties, AP.R

• Abstract

  To study the formation of hydrostatic and highly non-hydrostatic pressure induced multi phase state of crystalline solids. For each phase, to study the phonon anaharmonicity as function of the temperature and hydrostatic pressure. (AU)

  Hydrostatic and non-hydrostatic pressure effects on the strutural and dynamic properties of crystalline solids, AP.R

• Abstract

  The subject of this project is the synthesis, phenomenological studies, and computational simulation of physical properties and experimental characterization of ferroelectric materials, due to their high technological importance. Although there are reported innumerous theoretical and experimental works, the study of ferroelectric materials remain as an actual subject for researches. Since…

  Ferroelectric materials: phenomenology, properties and characterization, AP.TEM

• Abstract

  The present work aims at the synthesis and the study of the structural, vibrational and optical properties of glasses and glass-ceramics with composition (A1-xBx)O + SiO2, (A = Pb, Ba, Sr and B = Fe, Co, Cr) through in-situ measurements of Raman spectra as a function of temperature and pressure, correlating these experimental results with theoretical Molecular Dynamics (MD) simulated data…

  Study of structural and vibrational properties of glass and glass-ceramic materials via Raman scattering as a function of temperature and high hydrostatic pressures., BP.PD

• Abstract

  The doctoral work will address the sinthesis of glass and glass-ceramic materials of Pbx.A1-xO.SiO2, with A-Ni,Co,Cr, with low and high dopant levels, to study the structural characteristics by Raman scattering and optical properties by optical absorption and photoluminescence under high hydrostatic pressure conditions. (AU)

  Correlation between structure and optical properties of (Äx, A'1-x)O + SiO2(A,A'= Pb,Ni,Co,Cr) glass ceramic serie under high hydrostatic pressure, BP.DD

• Abstract

  Understanding the structure of glass is critical to creating predictive models for crystal nucleation and growth within glasses. BaO-2SiO2 (BS2) and CaO-SiO2 (CS) glasses are congruently crystallizing glasses that display homogeneous nucleation and have well characterized thermodynamic and kinetic properties. However, their structures have seen limited research. The study will focus on us…

  Nuclei entrapment: the pre-nucleation structural ordering of homogeneous nucleating BaO-2SiO2 and CaO-SiO2 glasses, BP.PD

(Only some records are available in English at this moment)

• Abstract

  Lead silicate glasses are widely used in different commercial applications due mostly to their high refractive index and X- and gamma-ray attenuation, which are closely linked to their high density. In this research project, pure and cobalt-doped lead metasilicate glasses and glass-ceramics will be submitted to simultaneous high temperature and high hydrostatic pressure compressions, whic…

  Structural study of pure and cobalt-doped lead metasilicate glasses and glass-ceramics under high-temperature compression, BE.EP.DD