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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 ...
O papel da interação elétron-elétron no regime Hall quântico interio.
(Universidade Federal de São Carlos, 2004-04-02)
Experimental and theoretical studies of the aspects of particle-like and collective behavior
of electrons in the proximity of the edges of two-dimensional (2DES) and quasi-one-dimensional
(Q1DES) systems, named quantum ...
Efeitos de interações elétron-elétron e spin-órbita nas propriedades magneto-eletrônicas de magneto-transporte de sistemas confinados.
(Universidade Federal de São Carlos, 2003-10-10)
Effects of the direct and exchange electron-electron interaction, external magnetic
field, symmetry of the charge carriers confining potential, radius, material g-factor, and
also of the spin-orbit interaction in zincblende ...
Dispersão dielétrica em materiais ferroelétricos.
(Universidade Federal de São Carlos, 2004-12-13)
In the last decades, the high frequency dielectric response has been one of
the most studied issues in the ferroelectricity area. The main dielectric
characteristic is the strong dependence of the dielectric parameters ...
Propriedades estáticas e dinâmicas de portadores em heteroestruturas semicondutoras.
(Universidade Federal de São Carlos, 2002-10-30)
We have studied the dynamic and the stationary properties of carriers in semiconductor
heterostructures submitted to electric fields AC and DC and to magnetic fields
within the effective-mass approximation based on ...
Caracterização elétrica, dielétrica e anelástica de transições de fase em cerâmicas de Pb (Fe1/2Nb1/2)O3
(Universidade Federal de São Carlos, 2007-09-20)
El Niobato de plomo y hierro Pb(Fe1/2Nb1/2)O3 es un material multiferroico: es ferroeléctrico a temperaturas inferiores a 383K y antiferromagnético a temperaturas inferiores a 143K, presentando propiedades magnetoelétricas ...
Regras de ocupação e influência de dopantes trivalentes em matrizes cerâmicas transparentes de PLZT 9/65/35
(Universidade Federal de São Carlos, 2009-10-01)
In this work, were investigated the occupancy of rare-earth ions in lattice site of the ferroelectric system (Pb,La)(Zr,Ti)O3, or PLZT. The influence on the structural, microestructural, dielectric, ferroelectric, optical ...
Estudo de nanopartículas para preparação de compósitos com acoplamento magnetoelétrico
(Universidade Federal de São Carlos, 2009-09-03)
In recent years the necessity of new devices, in the electroelectronic industry, has lead to an increasing interest in materials called magnetoelectric (ME) or multiferroic (MF). Multiferroic is the term used to classify ...
Estudo por espectroscopia Raman de efeitos de localização das excitações elementares em superredes e em ligas dopadas.
(Universidade Federal de São Carlos, 2005-03-22)
In the present work, the localization properties of the single-particle and collective excitations subjected to a random potential in the AlGaAsSi alloys and in the intentionally disordered GaAs/AlGaAs:Si superlattices (SL ...
Estudo sistemático das propriedades estruturais e magnéticas de amostras policristalinas do sistema PrxY1-xBa2Cu3O7-d
(Universidade Federal de São Carlos, 2008-08-10)
One of the most studied high TC superconductor is the YBa2Cu3O7 (Y-123) as well as the different substitutions on the Y site for different rare earth elements. Generally, this does not show important effects on the magnetic ...