Buscar
Mostrando ítems 21-30 de 430
Luminescent properties and lattice defects correlation on zinc oxide
(Elsevier B.V., 2001-11-01)
The ZnO luminescent properties are strongly influenced by the preparation method and they are principally related to electronic and crystalline structures. This work reports about the correlation among luminescence properties ...
Luminescent properties and lattice defects correlation on zinc oxide
(Elsevier B.V., 2001-11-01)
The ZnO luminescent properties are strongly influenced by the preparation method and they are principally related to electronic and crystalline structures. This work reports about the correlation among luminescence properties ...
Propriedades estruturais e controle da estequiometria de filmes finos de BiFeO3
(Universidade Estadual Paulista (Unesp), 2019-08-09)
O objetivo do trabalho foi estudar as propriedades estruturais dos filmes finos de ferrita de bismuto (BFO) ao se adicionar excesso de nitrato de ferro ao invés de nitrato de bismuto conforme muitas referências na literatura ...
Síntesis y caracterización óptica y estructural de películas delgadas de Cu_2 ZnSnS_4 crecidas por PVD (Physical Vapor Deposition) método de coevaporación
(2017-10-26)
En este trabajo se hicieron aportes significativos en la síntesis y estudio de propiedades de películas delgadas del compuesto Cu2ZnSnS4 (CZTS) con propiedades estructurales, ópticas y eléctricas, adecuadas para ser usadas ...
Characterization of phase changes during fabrication of copper alloys, crystalline and non-crystalline, prepared by mechanical alloying
(Universidad Nacional de Colombia - Sede Bogotá - Facultad de Ingeniería, 2016-09-01)
The manufacture of alloys in solid state has many differences with the conventional melting (casting) process. In the case of high energy milling or mechanical alloying, phase transformations of the raw materials are ...
Intercalação de íons em nanossilicatos
(2016-02-12)
Nessa tese foram realizados estudos de difração de raios-X para investigar processos de troca catiônica do íon Li+ para Ni2+, e vice versa, bem como de Li+ para Na+, confinados na argila mineral sintética Fluorohectorita ...
Tensiones superficiales en piezas tratadas por el proceso de deformación plástica en frío
(Departamento de Mecánica, 2010)
Este trabajo tiene como objetivo realizar el análisis de las micro y macrodeformaciones del acero AISI 1045 deformado en frío empleando un rodillo simple, para ello se tuvo en cuenta la difracción de rayos X realizando ...
Color tunability in green, red and infra-red upconversion emission in Tm3+/Yb3+/Ho3+ co-doped CeO2 with potential application for improvement of efficiency in solar cells
(Elsevier B.V., 2015-03-01)
The preparation of Tm3+/Yb3+/Ho3+ co-doped CeO2 prepared by the precipitation method using ammonium hydroxide as a precursor is presented. By X-ray diffraction the materials show the phase-type of fluorite structure and ...
Characterization of phase changes during fabrication of copper alloys,crystalline and non-crystalline, prepared by mechanical alloying.
The manufacture of alloys in solid state has many differences with the conventional melting (casting) process. In the case of high energy milling or mechanical alloying, phase transformations of the raw materials are ...