Listar por autoría "dcb153fa-931a-43c9-9854-b96f88f084aa"
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Field-enhanced bulk conductivity and resistive-switching in Ca-doped BiFeO3 ceramics
Royal Society of Chemistry (2014)The bulk conductivity at room temperature of Ca-doped BiFeO3 ceramics is p-type and increases reversibly by up to 3 orders of magnitude under the influence of a small dc bias voltage in the range B3 to 20 V mm1 . The ... -
Field-induced p-n transition in yttria-stabilized zirconia
Nature (2019)Oxide ion conducting yttria-stabilised zirconia ceramics show the onset of electronic conduction under a small bias voltage. Compositions with a high yttria content undergo a transition from p-type to n-type behavior at ...
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From Complex Inorganic Oxides to Ag–Bi Nanoalloy: Synthesis by Femtosecond Laser Irradiation
American Chemical Society (2018-08-24)Bimetallic nanoalloys with a wide variety of structures and compositions have been fabricated through many diverse techniques. Generally, various steps and chemicals are involved in their fabrication. In this study, the ...
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High photocatalytic activity of Ag/Ag3PO4:W heterostructure formed by femtosecond laser irradiation
Sao Paulo State University. Institute of Chemistry (2022-04-11)In this work, the W-doped Ag3PO4 was prepared by the chemical coprecipitation method and irradiated with a femtosecond laser (FL). The successful formation of the Ag/Ag3PO4:W heterostructure was confirmed by XRD analysis. ...
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Improvement in varistor properties of CaCu3Ti4O12 ceramics by chromium addition
Elsevier (2019-11-17)The effect of chromium addition on the structure and electrical properties of CaCu3Ti4O12 is studied. Compositions based on the formula CaCu3Ti4-xCrxO12-δ (x = 0, 0.025, 0.050 and 0.075 mol%) are prepared by solid-state ...
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Key insights on the structural characterization of textured Er2O3–ZrO2 nano-oxides prepared by a surfactant-free solvothermal route
Elsevier (2012)Zirconia-mixed oxides can exhibit cubic fluorite and pyrochlore structure. Their discrimination is not easy in nanooxides with a crystal size close to that of a few unit cells. In this work, high resolution transmission ...
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Kinetics or thermodynamics? Extolling their role to modulate the crystal phases and luminescence of KY3F10:Eu3+ powders
Royal Society of Chemistry (2023-09-28)KY3F10, a fluoride compound with two polymorphs (alpha and delta), has been a subject of study due to its unique properties. Obtaining the metastable delta-phase has been challenging, but this study presents an enhanced ...
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Lanthanide doped ZnS quantum dots dispersed in silica glasses: an easy
one pot sol–gel synthesis for obtaining novel photonic materials
Royal Society of Chemistry (2008)Silica glasses containing both ZnS quantum dots (QDs) and luminescent lanthanide ions are attractive candidates to develop new lighting displays, sensor devices or laser emitters. This work reports an easy sol–gel method ...
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Laser and electron beam-induced formation of Ag/Cr structures on Ag2CrO4
Royal Society of Chemistry (2019)The interactions of silver chromate (Ag2CrO4) with a femtosecond (fs) laser and electron beam irradiations were investigated. For the first time, the growth and coalescence of metallic Ag nanoparticles (NPs) on an Ag2CrO4 ...
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Laser-induced formation of bismuth nanoparticles
Royal Society of Chemistry (2018)In the current communication, the synthesis of metallic Bi nanoparticles with coexisting crystallographic structures (rhombohedral, monoclinic, and cubic) obtained via direct femtosecond laser irradiation of NaBiO3 is ... -
Laser/Electron Irradiation on Indium Phosphide (InP) Semiconductor: Promising Pathways to In Situ Formation of Indium Nanoparticles
Wiley (2018)In the current study, whether femtosecond laser and electron beam irradiation of indium phosphide (InP) are “green,” fast, and effective methods to produce metallic In nanoparticles is probed. High-resolution transmission ...
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“MasterChemist”: A Novel Strategy for Reviewing Stoichiometry and Introducing Molecular Gastronomy to Chemistry Students
American Chemical Society and Division of Chemical Education, Inc. (2022-09-06)This article presents and discusses the results of an educational innovation that seeks to introduce the world of molecular gastronomy in chemistry lessons as a means to review stoichiometry and offer an alternative way ...
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New insights in the structure-luminescence relationship of Eu:SrAl2O4
Elsevier (2009)This work aims the preparation of Eu:SrAl2O4 through a sol-gel methodology. Some studies point out the possibility that hexagonal polymorph exhibit higher luminescence efficiency than the monoclinic one. However, the slow ...
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New insights on organosilane oligomerization mechanisms using ESI-MS and 29Si NMR
Royal Society of Chemistry (2009)The use of electrospray ionization mass spectrometry (ESI-MS) in parallel with 29Si and 1H NMR to elucidate the aqueous speciation and temporal evolution of the organosilane methyldiethoxysilane (MDES) through hydrolysis ...
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New insights on the structural and optical properties of Ce–Ti mixed oxide nanoparticles doped with praseodymium
Royal Society of Chemistry (2010-10-26)Nanostructured, doped Ce–Ti mixed oxides are potential materials for several applications such as pigments, catalysis, fuel cells, optical films, and gas sensors. In this article, a series of Pr-doped Ce–Ti oxides have ...
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New red-shade environmental-friendly multifunctional pigment based on Tb and Fe doped Y2Zr2O7 for ceramic applications and cool roof coatings
Elsevier (2016)A new red-shade environmental friendly ceramic pigment with the general formula Y2−xTbxZr2−yFeyO7−δ [x = 0, 0.25 and y = 0.15, 0.25, 0.35] was prepared by a polymeric sol-gel process and after calcination at 1300 °C for ...
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Non-Ohmic Phenomena in Mn-doped BaTiO3
Wiley-Blackwell (2012)We report here a novel effect in which the resistance of a semiconducting oxide ceramic increases on application of a small dc bias. The ceramic conducts at high temperatures by an n-type hopping mechanism. On application ...
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Optical smoke detector: an approach to semiconductors field for high level education students
International Academy of Technology, Education and Development (IATED) (2019-06-01)Nowadays, it is undeniable that the amount of technological devices is having a sharp increase all around us, with important benefits and repercussions for the society. Despite this, students are not used to knowing the ...
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Phase transition hysteresis and anomalous Curie-Weis behavior of ferroelectric tetragonaltungsten bronzes Ba2RETi2Nb3O15:RE=Nd, Sm
American Institute of Physics (2008)The ferroelectric tetragonal tungsten bronze TTB phases, Ba2RETi2Nb3O15 :RE=Nd,Sm, were prepared by low temperature solvothermal synthesis. The permittivity versus temperature data of sintered ceramics show two unusual ...
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Photonic and Nanobiophotonic Properties of Luminescent Lanthanide-Doped Hybrid Organic-Inorganic Materials
Royal Society of Chemistry (2008)Research into lanthanide-doped organic–inorganic hybrid materials emerged in the 1990s with the development of interesting materials for optics: high efficiency and stable solid-state lasers, new fiber amplifiers and ...
