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Obtenção, propriedades e fenomenologia de materiais ferroelétricos com estrutura tungstênio bronze
(Universidade Federal de São Carlos, 2007-02-23)
The processing of lead metaniobate (PN) ferroelectric ceramics was optimized, therefore, in
this work, the main details to obtain PN ceramics with density higher than 96 % of the ideal density
are presented and ...
Estudo por espalhamento Raman de efeitos anarmônicos e transição de fase do PbTiO3 : Sm3+ induzidos por pressão hidrostática e variação de temperatura
(Universidade Federal de São Carlos, 2007-10-05)
In this work it was investigated, by using Raman spectroscopy, the effect of
the substitucional disorder on the vibrational properties of the ferroelectric
ceramics PbTiO3 doped with Samarium, at different temperatures ...
Eletrocerâmicas de BNBK dopadas com tântalo: processamento, fenomenologia e propriedades de armazenamento de energia
(Universidade Federal de São Carlos, 2019-03-29)
Global energy demand for high energy storage capability materials associated with the search for lead-free electroceramic materials with suitable properties for applications has become the major topic in functional materials ...
Síntese e caraterização de MgxPb(1-x)TiO3
(Universidade Federal de São Carlos, 2015-08-14)
We report the investigation of structural, optical and electrical properties of the MgxPb(1-
x)TiO3 ceramic system produced by mechanosynthesis. The solid state reaction
manufacturing method has been proved to be an ...
Estudo sistematico das propriedades termodinâmicas e criticalidade de filmes finos e super-redes magnéticas.
(Universidade Federal de São Carlos, 2004-12-10)
In this work we will study through the differential operator technique the surface
effect in anisotropic spin ½ quantum Heisenberg model, through theory of effective field
(EFT), of a two-spins cluster, in case of simple ...
Estudo das transições de fase em cerâmicas ferroelétricas de PZT e PLZT através de espectroscopia mecânica
(Universidade Federal de São Carlos, 2008-10-08)
Lead titanate zirconate (PZT) and lanthanum-modified lead titanate zirconate (PLZT) ferroelectric ceramics have been great scientific and technologic interest, due to the possibility
of your physics properties can be ...
Efeitos anarmônicos e transições de fase em Pb1¡xLaxTiO3: estudo por espalhamento Raman dos efeitos de substituição catiônica, temperatura e pressão hidrostática
(Universidade Federal de São Carlos, 2008-08-22)
In this work were studied e®ects of cationic substitution, hydrostatic pressure and temperature on the phonon spectra of PLT samples, Pb1¡xLaxTiO3 (PLT), using Raman scattering technique. The samples having La concentration ...
Interação da matéria de vórtices com estruturas de defeitos em filmes de Nb
(Universidade Federal de São Carlos, 2009-03-30)
In this work we have studied the Vortex Matter dynamics in Nb superconducting films with different arrays of columnar defects. For that we studied the order-disorder line H (T) OD , where the melting of the vortex lattice ...
Aplicações da espectroscopia Raman ao estudo dos efeitos de temperatura e de pressão hidrostática em cristais orgânicos: 2-amino-1,3,4- tiadiazol, 2-amino-5-fenil-1,3,4-tiadiazol e 2-amino-5-(4-deciloxi-fenil)-1,3,4- tiadiazol
(Universidade Federal de São Carlos, 2015-03-27)
Molecular organic crystals are a promising class of materials because of their
excellent physical, chemical and biological properties. Among them, Thiadiazole and its
derivatives have been investigated in the last years ...
Modelos de spins geometricamente frustrados: transição de fase e estruturas de platores
(Universidade Federal de São Carlos, 2013-04-08)
This thesis presents a study of the magnetization plateau and the phenomenon of geometrical frustration in spin systems applied to lattices with triangular structure, as well as the results achieved by applying the ...