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View article: Direitos indígenas: as leis aprovadas pelo estado de Roraima e a competência para legislar sobre a matéria
Direitos indígenas: as leis aprovadas pelo estado de Roraima e a competência para legislar sobre a matéria Open
The article deals with the legislation produced by the state of Roraima regarding indigenous rights and the scope of competence established by the federal constitution to legislate on the matter. The Federal Supreme Court decided in 2014, …
View article: Microstructure and hardness properties for laser powder directed energy deposition cladding of Inconel 718 on electron beam powder-bed fusion fabricated Inconel 625 substrates: As-built and post-process heat treated
Microstructure and hardness properties for laser powder directed energy deposition cladding of Inconel 718 on electron beam powder-bed fusion fabricated Inconel 625 substrates: As-built and post-process heat treated Open
Laser powder directed energy deposition (LP-DED) additive manufacturing (AM) deposited Inconel 718 claddings (at laser power levels of 800, 1000, and 1200 W) onto Inconel 625 substrates fabricated by electron beam powder-bed fusion (EB-PBF…
View article: First- to Second-Order Magnetic Transitions in Ho5Si3: Role of Annealing on Magnetocaloric Properties
First- to Second-Order Magnetic Transitions in Ho5Si3: Role of Annealing on Magnetocaloric Properties Open
View article: Characterization of Major Health Consequences of People Experiencing Homelessness in Chile
Characterization of Major Health Consequences of People Experiencing Homelessness in Chile Open
View article: Novel insights into PLMN-13PT ceramics: impact of spark plasma sintering on compositional and dielectric properties
Novel insights into PLMN-13PT ceramics: impact of spark plasma sintering on compositional and dielectric properties Open
This study investigates the effects of Spark Plasma Sintering (SPS) on the physical, structural, microstructural, dielectric, and optical properties of on 87[Pb (1−y) Laₓ(Mg 1/3 Nb 2/3 )O 3 ]-13PbTiO 3 , (PLMN-13PT) ceramics. The primary o…
View article: A Tunable Optical 90° Hybrid Coupler in SOI for Wavelength-Independent Coherent Receivers
A Tunable Optical 90° Hybrid Coupler in SOI for Wavelength-Independent Coherent Receivers Open
We present the design and experimental characterization of an integrated optical 90° hybrid coupler in SOI that shows adjustable performance across the full C band, allowing multi-wavelength coherent analog links using identical receiver P…
View article: Polar orientation and extension in a novel crystallographic model for PbTiO<sub>3</sub>-based perovskites explaining the experimental ferroelectric thermal anomalies
Polar orientation and extension in a novel crystallographic model for PbTiO<sub>3</sub>-based perovskites explaining the experimental ferroelectric thermal anomalies Open
PbTiO 3 -based ferroelectric solid-solution ceramics have been widely used for electromechanical devices. However, it is still challenging to separate and control the contributions to the electromechanical functionalities, mainly as a func…
View article: ESTRUTURAÇÃO, ARCABOUÇO METODOLÓGICO E APLICAÇÃO DO CURSO DE ESPECIALIZAÇÃO “CIÊNCIA É 10!”
ESTRUTURAÇÃO, ARCABOUÇO METODOLÓGICO E APLICAÇÃO DO CURSO DE ESPECIALIZAÇÃO “CIÊNCIA É 10!” Open
Este texto é uma composição coletiva baseada na pesquisa narrativa da estruturação, do arcabouço metodológico e da aplicação do curso de especialização Ciência é 10! cuja fundamentação é o ensino de ciências por investigação. O objetivo de…
View article: Publisher's Note: “Unveiling the strain and structural ferroelectric phase transition induced by temperature in lead titanate perovskite modified with 40% of calcium” [J. Appl. Phys. 132, 244101 (2022)]
Publisher's Note: “Unveiling the strain and structural ferroelectric phase transition induced by temperature in lead titanate perovskite modified with 40% of calcium” [J. Appl. Phys. 132, 244101 (2022)] Open
Unveiling the strain and structural ferroelectric phase transition induced by temperature in lead titanate perovskite
View article: Structural Quantification of Polar/Nonpolar Phases of Relaxor Clusters in Transparent Ferroelectric Ceramics
Structural Quantification of Polar/Nonpolar Phases of Relaxor Clusters in Transparent Ferroelectric Ceramics Open
View article: Effect of rare earth additives on the properties of the PLMN-13PT:RE transparent ceramics
Effect of rare earth additives on the properties of the PLMN-13PT:RE transparent ceramics Open
The transparent relaxor ferroelectric ceramics of the system lanthanum modified lead magnesium niobate (PLMN-13PT) have been investigated for a variety of electro-optic, properties; good electro-optic switching times and modest half-wave v…
View article: Roadmap for space group construction of an isovalent modified perovskite based on electron diffraction data
Roadmap for space group construction of an isovalent modified perovskite based on electron diffraction data Open
This paper presents a guideline to aid the space group determination of distorted perovskites by a combination of properties, selected area (SAED) and convergent beam electron diffraction (CBED). The case study reported here is based on th…
View article: Revisiting phase transitions in Ca-modified lead titanate ceramics using synchrotron XRD
Revisiting phase transitions in Ca-modified lead titanate ceramics using synchrotron XRD Open
Lead titanate (PbTiO3) is a prototype ferroelectric material.At high temperatures, it presents the ideal centrosymmetric cubic perovskite structure with Pm-3m symmetry.Cooling down to 770 K, a first-order phase transition from the paraelec…
View article: Síntese in situ pelo método Pechini para obtenção do compósito SBN61/NFO sem crescimento anormal de grão
Síntese in situ pelo método Pechini para obtenção do compósito SBN61/NFO sem crescimento anormal de grão Open
Resumo Este trabalho teve por objetivo sintetizar in situ pelo método Pechini, pós do compósito magnetoelétrico Sr0,61Ba0,39Nb2O6/NiFe2O4 (SBN61/NFO), na proporção 50/50 molar, visando obter amostras sinterizadas com controle de cresciment…
View article: Análise da expansão térmica volumétrica e das características estruturais de soluções sólidas de (Pb, Ca)TiO3 entre 150 e 570 K
Análise da expansão térmica volumétrica e das características estruturais de soluções sólidas de (Pb, Ca)TiO3 entre 150 e 570 K Open
Resumo Corpos cerâmicos de Pb1-xCaxTiO3 (titanato de chumbo modificado com cálcio) foram preparados, em concentrações 0,24≤x≤0,55, para a determinação da natureza das anomalias de expansão térmica volumétrica observadas neste sistema ferro…
View article: Magnetic and ferroelectric phase coexistence in multiferroic PFW-PT ceramics#
Magnetic and ferroelectric phase coexistence in multiferroic PFW-PT ceramics# Open
The multiferroic (1-x)PbFe2/3W1/3O3–xPbTiO3 solid solutions with various compositions x = 0, 0.10, 0.20 and 0.30 were investigated. The features of the relaxor-to-ferroelectric transition with increasing x were discussed based in connectio…
View article: Guest Editorial
Guest Editorial Open
View article: Optimization of parameters in the synthesis of 0.90Pb(Zn1/3Nb2/3)O3–0.10PbTiO3 (PZN-10PT) powders obtained by the mixed oxides method
Optimization of parameters in the synthesis of 0.90Pb(Zn1/3Nb2/3)O3–0.10PbTiO3 (PZN-10PT) powders obtained by the mixed oxides method Open
Preventing the formation of the pyrochlore phase in the synthesis of PZN-PT powders requires controlling calcination parameters such as temperature, soaking time and atmosphere. These parameters were examined extensively to determine the t…
View article: The relationship between ferroelectric domain pattern and properties of PLT21 ceramics
The relationship between ferroelectric domain pattern and properties of PLT21 ceramics Open
The light passing through a ferroelectric crystal tends to split into several separate beams due to refraction and reflection at the domain walls. This interaction of light with ferroelectric domains becomes one of the most important featu…
View article: Grain size and interfacial interdiffusion influence on the magnetic and dielectric properties of magnetoelectric La0.7Ba0.3MnO3–BaTiO3 composites
Grain size and interfacial interdiffusion influence on the magnetic and dielectric properties of magnetoelectric La0.7Ba0.3MnO3–BaTiO3 composites Open
View article: Effects of lanthanum content on the thermo-optical properties of (Pb,La)(Zr,Ti)O3
Effects of lanthanum content on the thermo-optical properties of (Pb,La)(Zr,Ti)O3 Open
In this work the thermal lens spectrometry, the optical interferometry and the thermal relaxation calorimetry were employed to determine the thermo-optical properties of transparent ferroelectric ceramic (Pb,La)(Zr,Ti)O3 or PLZT, as a func…
View article: Room temperature nonlinear magnetoelectric effect in lead-free and Nb-doped AlFeO3 compositions
Room temperature nonlinear magnetoelectric effect in lead-free and Nb-doped AlFeO3 compositions Open
It is still a challenging problem to obtain technologically useful materials displaying strong magnetoelectric coupling at room temperature. In the search for new effects and materials to achieve this kind of coupling, a nonlinear magnetoe…