Browsing by Author "Conde Amiano, Alejandro"
Now showing items 1-20 of 131
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A constant magnetocaloric response in FeMoCuB amorphous alloys with different FeB ratios [Article]
(AIP Publishing, 2007-05-04)The magnetocaloric effect of Fe91−xMo8Cu1Bx (x = 15 , 17 , 20) amorphous alloys has been studied. The temperature of the peak of magnetic entropy change can be tuned by altering the Fe / B ratio in pk pk the alloy, without ...
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A Finemet-type alloy as a low-cost candidate for high-temperature magnetic refrigeration [Article]
(AIP Publishing, 2006)The refrigerant capacity RC of Fe68.5Mo5Si13.5B9Cu1Nb3 alloy is studied. For the amorphous sample, RC=63 J kg−1 for an optimal reversible cycle with cold and hot ends at 328 K and 520 K, respectively, for a maximum ...
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A procedure to extract the magnetocaloric parameters of the single phases from experimental data of a multiphase system. [Article]
(AIP Publishing, 2014)In this work, we propose a method to extract the individual parameters that describe the field dependence of magnetic entropy change of each phase in a multiphase system. This method makes use of the scaling laws of the ...
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A quantitative criterion for determining the order of magnetic phase transitions using the magnetocaloric effect [Article]
(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 ...
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A unified approach to describe the thermal and magnetic hysteresis in Heusler alloys [Article]
(American Institute of Physics Publising LLC, 2016)Different excitations, like temperature, magnetic field, or pressure, can drive a martensitic transition in Heusler alloys. Coupled phenomena in these materials lead to interesting magnetocaloric and barocaloric effects ...
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Amorphization and evolution of magnetic properties during mechanical alloying of Co62Nb6Zr2B30: dependence on starting boron microstructure [Article]
(Elsevier, 2014)Co62Nb6Zr2B30 composition was mechanically alloyed using three different types of boron powders in the starting mixture: crystalline β-B, commercial amorphous B and optimized amorphous B via ball milling. Using optimized ...
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Analysis of nanocrystallization kinetics and crystal size distribution under limited growth approach [Article]
(Elsevier, 2012)Two different simulation approaches have been used to describe nanocrystallization processes: a limited growth approach, which is an extension from instantaneous growth approximation, and an average soft impingement ...
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Analysis of the magnetoresistance contributions in a nanocrystallized Cr-doped FINEMET alloy [Article]
(Elsevier, 2011)The magnetoresistance (MR) was measured at 200, 250 and 300 K in magnetic fields up to B=12 T for a nanocrystallized Fe63.5Cr 10Nb3Cu1Si13.5B9 alloy. Both the longitudinal (LMR) and transverse (TMR) component of the ...
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Autocalibrating quasistatic M‐H hysteresis loop tracer with negligible drift [Article]
(AIP Publishing, 1996)A computer‐controlled system for measuring M‐Hhysteresis loops of soft magnetic materials is described. It overcomes many of the problems associated with these kinds of measurements of low coercivity materials. The combination ...
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Ball milling nanocrystallization of arc-melted and melt-spun Fe78Co5Nb3Zr3B5Ge5Cu1 alloy: microstructure and magnetic properties [Article]
(Taylor & Francis, 2006)The viability of developing a nanocrystalline microstructure for the Fe78Co5Nb3 Zr3B5Ge5Cu1 composition using a planetary ball mill was studied. Two starting samples were chosen: an arc-melted ingot and a partially ...
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Cellular automata simulations on nanocrystallization processes: From instantaneous growth approximation to limited growth [Article]
(Elsevier, 2011-07)Cellular automata simulations have been performed to simulate the crystallization process under a limited growth approximation. This approximation resembles several characteristics exhibited by nanocrystalline microstructures ...
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Comparison of equivalent ball milling processes on Fe70Zr30 and Fe70Nb30 [Article]
(Elsevier, 2012)Dynamical analysis of the movement of a single ball in a planetary ball mill yields a cubic law with the frequency of the mill for the power released during the process. This fact has been explored for two binary compositions ...
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Correlation between microstructure and temperature dependence of magnetic properties in Fe 60 Co 18 ( Nb , Zr ) 6 B 15 Cu 1 alloy series [Article]
(AIP Publishing, 2009-05-14)Temperature dependence of magnetic properties of nanocrystalline Fe60Co18Cu1B15Nb6−xZrx (x =0, 3, 6) alloys has been studied at different stages of devitrification. Transmission electron microscopy shows nanocrystals of ...
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Cristalización de aleaciones FeCoNbB(Cu) : Microestructura y propiedades magnéticas [PhD Thesis]
(2002) -
Cristalización de vídrios metálicos del sistema Fe-B-Si [PhD Thesis]
(1988-09-05) -
Crystallization behavior and magnetic properties of Cu-containing Fe- Cr- Mo- Ga- P- C- B alloys [Article]
(2006)Multicomponent Fe65.5Cr4Mo4Ga4P12C5B5.5 amorphous alloy is known to have good soft magnetic properties combined with large glass-forming ability. Searching for a nanocrystalline structure that could improve its magnetic ...
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Crystallization kinetics and soft magnetic properties in metalloid-free (Fe, Co)90Zr10 amorphous and nanocrystalline alloys [Article]
(Elsevier, 2014)Microstructure and magnetic properties of metalloid-free (Fe100- xCox)90Zr10 amorphous and nanocrystalline alloys were characterized. Devitrification of these amorphous alloys occurs in two overlapped transformations leading ...
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Dependence of exchange anisotropy and coercivity on the Fe–oxide structure in oxygen-passivated Fe nanoparticles [Article]
(American Institute of Physics, 1999)Ultrafine Fe particles have been prepared by the inert gas condensation method and subsequently oxygen passivated. The as-obtained particles consist in an Fe core surrounded by an amorphous Fe-oxide surface layer. The ...
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Detection of the onset of nanocrystallization by calorimetric and magnetic measurements [Article]
(AIP Publishing, 2005-01-24)It is generally accepted that measurements of the magnetic properties are more sensitive than measurements of the enthalpy changes in the detection of the onset of crystallization of ferromagnetic phases emerging from a ...
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Dinámica reticular y efectos de difracción en cristales moleculares [PhD Thesis]
(1983)