Buscar
Mostrando ítems 281-290 de 642
Artículo
Mössbauer study of FeCoNbBCu hitperm-type alloys
(AIP Publishing, 2002)
FeCoNbBCu alloys have been studied by Mössbauer spectrometry. A high contribution of the interfacial region in the nanocrystalline samples to the hyperfine field distribution is detected. The possible presence of B in the ...
Artículo
Recent insights into xerogel and aerogel mineral composites for CO 2 mineral sequestration
(Springer Nature, 2011)
Supercritically dried composites have already been analysed and proposed as carbon dioxide sequesters. However, the economical and energetic costs of the supercritical drying process had to be re-evaluated, and were ...
Artículo
Instantaneous growth approximation describing the nanocrystallization process of amorphous alloys: A cellular automata model
(Elsevier, 2008-07)
A cellular automata simulation based on an instantaneous growth approximation is developed to model the nanocrystallization kinetics. In this frame, the time required for a nucleus to grow up to its maximum size is ...
Artículo
A quantitative criterion for determining the order of magnetic phase transitions using the magnetocaloric effect
(Nature Publishing Group, 2018)
The ideal magnetocaloric material would lay at the borderline of a first-order and a second-order phase transition. Hence, it is crucial to unambiguously determine the order of phase transitions for both applied magnetocaloric ...
Artículo
On the isothermal kinetics analysis of transformations in metastable systems. A combined use of isothermal and non-isothermal calorimetry
(Taylor & Francis, 2007)
A procedure to optimize the isothermal calorimetric data of very slow transformation processes of metastable systems is proposed. The method uses an experimental baseline to identify the transitory effects due to the ...
Artículo
Obtaining magnetocaloric MnCo(Fe)Ge intermetallics from low temperature treatment of mechanically alloyed precursors
(Elsevier, 2020)
Production of the intermetallic MnCo0.8Fe0.2Ge phase, interesting as magnetocaloric material, is obtained by using an almost fully amorphous mechanically alloyed precursor. Thermal treatment to develop the intermetallic ...
Artículo
The magnetocaloric effect in soft magnetic amorphous alloys
(2007)
The influence of different compositional modifications on the magnetic entropy change and refrigerant capacity of Finemet, Nanoperm, HiTperm, and bulk amorphous alloys is presented. For all the studied alloys, the field ...
Artículo
Mechanochemistry of copper sulphides: phase interchanges during milling
(Springer Nature, 2017)
Covellite, CuS and chalcocite, Cu2S nanoparticles prepared in the explosive manner from elemental precursors were further ball-milled in order to observe additional changes caused by mechanical action. Three phases of ...
Artículo
Artículo
Microestructura y propiedades mecánicas a altas temperaturas del α-SIC sinterizado con fase líquida de Y2O3-Al2O3
(2005)
Muestras de α-SiC han sido sinterizadas con fase líquida (LPS) a 1950 ºC, en atmósfera de argón y tiempos de procesado entre 1 y 7 horas. Mediante microscopia electrónica de barrido (SEM) se ha caracterizado la microestructura, ...