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Mostrando ítems 11-20 de 163
Artículo
Lattice-Dynamical Calculation of Second-Order Thermal Diffuse Scattering in Molecular Crystals
(International Union of Crystallography, 1985)
A computer procedure has been developed to calculate second-order thermal diffuse scattering (TDS) intensity for molecular crystals from latticedynamical calculations with an atom-atom potential in the Born-von K~irmfin ...
Artículo
A Direct Extension of the Avrami Equation to Describe the Non-isothermal Crystallization of Al-base Alloys
(Elsevier, 2007)
A direct extension of the Avrami equation considering the temperature dependence of the frequency factor is applied to describe the crystallization of a series of Al-Mm-Ni-Co amorphous alloys (Mm is a mischmetal). For high ...
Artículo
Mean magnetic moment of polydisperse superparamagnetic nanoparticles: Correlation between grain size and magnetic moment distributions
(American Scientific Publishers, 2007)
The field dependence of magnetization in superparamagnetic systems can be fitted using a set of Langevin contributions characterized by their particle densities and their magnetic moments. In fact, these contributions are ...
Artículo
Specific Heat Measurements on Amorphous and Nanocrystalline Al88Y5Ni5Co2
(Elsevier, 2009)
Specific heat at constant pressure, CP, was measured on amorphous and nanocrystalline Al88Y5Ni5Co2 alloys from differential scanning calorimetry experiments. Linear behavior of CP versus temperature from 323 to 423 K is ...
Artículo
The Structure of l-Phenyl-4,5-(l,2-D-glucofurano)imidazolidin-2-one
(International Union of Crystallography, 1980)
The crystal structure of Cl3Ht6N20 5 has been solved by direct methods. Crystal data are a -- 9.033 (1), b -- 10.097 (1), c -- 7.155 (1)A, fl= 105.92 (1) °, Z -- 2, space group P21 (from statistics). The final R value ...
Artículo
Magnetocaloric effect in Mn-containing Hitperm-type alloys.
(AIP Publishing, 2007)
The magnetocaloric effect of Fe60−xMnxCo18Nb6B16 x=0,2,4 is studied. Mn addition decreases the Curie temperature of the alloys but also reduces the peak entropy change and the refrigerant capacity of the material. The ...
Artículo
Tailoring of magnetocaloric response in nanostructured materials: Role of anisotropy
(2008-03-25)
The magnetocaloric response of an ensemble of oriented uniaxial magnetic objects, perpendicularly magne- tized to their easy axes, for temperatures close to the blocking temperature is calculated with the aim of demonstrating ...
Artículo
Influence of Thermal and Magnetic History on Direct DTad Measurements of Ni49+xMn36-xIn15 Heusler Alloys
(MDPI, 2019-10-25)
In the present work, using Heusler Ni49+xMn36-xIn15 (with x = 0 and 0.5) alloys, it is shown that the choice of the appropriate measurement protocol (erasing the prior state of the sample in between experiments) in DTad ...
Artículo
Enhancement of the Magnetic Refrigerant Capacity in Partially Amorphous Fe 70Zr 30 Powders Obtained by Mechanical Alloying
(Elsevier, 2012)
After mechanical alloying Fe 70Zr 30 composition from pure starting powders, an amorphous phase with Curie temperature T C = 244 K and an intermetallic compound (that should be non-stoichiometric Zr-rich fcc Fe 2Zr phase) ...
Artículo
The magnetocaloric effect in materials with a second order phase transition: Are T C and T peak necessarily coincident?
(AIP Publishing, 2009)
Using the Arrott–Noakes equation of state it is shown that the Curie point TC and the temperature where the magnetic entropy change is maximum Tpeak coincide only in the mean field approximation, but the Heisenberg ...