C25H30N2010, Mr = 518·5, orthorhombic, P2 1212¡, a= 12·303 (2), b =:= 25·071 (4), e=pentyl chain range from 45 to 80°. The crystal cohesion is mainly dueto van der Waa1s interactions 8·823 (5) A, V= 2721·4 (16) Á3 Z = 4, Dx =but there are two possible hydrogen bonds along 1·265 Mgm-, t\(Mo Ka) =0·7107 Á, .=[100] and [001]. ...
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December 11, 2017 (v1)PublicationUploaded on: March 27, 2023
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January 14, 2015 (v1)Publication
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Uploaded on: December 4, 2022 -
December 11, 2017 (v1)Publication
1-(3,5-Dimethyl-3-nitro-1-pyrazolin-4-yl) penta-0-acetyl-o-galacto-pentitol, e20H29N 3012, Mr= 503·5, orthorhombic, P21212¡, a= 14·471 (9), b = 14·518 (3), e= 12·028 (2) A, V= 2527·0 (1·7) A3, z = 4, Dx = 1·323 Mg m- 3, .A(Mo Ka)= 0·7107 A, J.L = 0·1O mm- 1, F(OOO) = 1064, room temperature, final wR = 0·035 for 1836 observed...
Uploaded on: March 27, 2023 -
June 3, 2020 (v1)Publication
The influence of composition changes on the devitrification process, microstructure and magnetic properties of (Fe,Co)MoB(Cu) alloys was investigated. Amorphous and nanocrystalline samples were studied by differential scanning calorimetry, thermomagnetic gravimetry, X-ray diffraction, transmission electron microscopy and vibrating sample...
Uploaded on: March 27, 2023 -
June 3, 2020 (v1)Publication
La desvitrificación de la aleación amorfa Fe75Cu2Nb3SÍ2Q 5 B9 5 tiene lugar en dos etapas. El principal resultado de la primera etapa es la nanocristalización, que da lugar a una nanofase cristalina Fe,Si homogéneamente dispersa en la matriz amorfa. Al aumentar la temperatura, el contenido en Si de los nanocristales de Fe,Si disminuye, como...
Uploaded on: December 4, 2022 -
January 27, 2016 (v1)Publication
The temperature dependence of the hysteresis loops of Nanoperm-type alloys has been studied. In the high-temperature region above the coercivity maximum, the response of the system can be modeled as that of dipolar-interaction superparamagnetic particles, considering a mean interaction field. Special attention has been paid to the influence of...
Uploaded on: March 27, 2023 -
December 4, 2019 (v1)Publication
The effect of the Si/B ratio on the magnetic anisotropy distribution of Fe73.5Si22.52xBxCu1Nb3 (x57,9,16) alloys has been studied. The influence of isochronal annealing on the hysteresis loop of the three studied alloys has been analyzed. They present two minima in coercivity: the first one can be ascribed to structural relaxation, and the...
Uploaded on: March 27, 2023 -
June 4, 2020 (v1)Publication
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 and nanocrystallization kinetics. Avrami exponent decreases from a value n = 4 indicating interface controlled growth...
Uploaded on: December 4, 2022 -
January 27, 2016 (v1)Publication
The recrystallization process in FeCoNbBCu nanocrystallinealloys is evidenced from thermomagnetic results as a significant decrease in magnetization at the second crystallization stage. The lowering in the volume fraction of α-FeCo crystals indicates that some of these crystals contribute to the boride phases formed. Electron microscopy images...
Uploaded on: March 27, 2023 -
December 1, 2015 (v1)Publication
A Mössbauer spectrometry and magnetic study have been performed on FeCoSiAlGaPCB amorphous alloys in order to get information about the variations in the atomic short range order with the substitution of Fe by Co. The decrease of the Curie temperature with decreasing Fe content was analyzed in the framework of the molecular field theory. The...
Uploaded on: March 27, 2023 -
December 21, 2016 (v1)Publication
The classical theory of Johnson-Mehl-Avrami-Kolmogorov (JMAK) is widely used to describe the kinetics of crystallization even when the premises required for its application are not strictly fulfilled. In this paper we propose a procedure to obtain the JMAK parameters of the independent transformations that simultaneously occur during a...
Uploaded on: December 4, 2022 -
December 7, 2016 (v1)PublicationAnalysis of nanocrystallization kinetics and crystal size distribution under limited growth approach
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 simulation where spherical crystallites grow to a size for which the corresponding region depleted in Fe (or the element enriched...
Uploaded on: December 4, 2022 -
December 7, 2016 (v1)Publication
A new approach is proposed for the study of crystallization processes under the hypothesis of isokinetic behavior. From a direct extension of the Avrami theory to non-isothermal regimes, an expression of the local Avrami exponent as a function of the crystalline volume fraction is obtained from a single DSC run performed at a constant heating...
Uploaded on: March 27, 2023 -
December 2, 2015 (v1)Publication
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 properties, Cr and Mo were partially substituted by Cu. The devitrification process of Cu-containing alloys shows an...
Uploaded on: December 4, 2022 -
December 14, 2017 (v1)Publication
6- (p-Bromophenyl)-4-ethyl-3-hydroxy-2- (1,2,3-trihydroxypropyl)-2,3,3 a,5,6,6 a-hexahydrofuro- [2,3-d]imidazole-5(4H)-thione monohydrate, C16H21- BrN2OsS.H20, Mr----451.3, orthorhombic, P21212 l, a = 6.073 (3), b = 15.977 (8), c = 19.213 (9) A, V= 1864 (2) A 3, Z = 4, D m = 1.62 (1), D x-- 1.61 Mg m -a, 2(Mo Ka) = 0.7107 A, g= 2.32 mm -1,...
Uploaded on: March 27, 2023 -
December 13, 2017 (v1)Publication
Mr=336'30, orthorhombic, P21212 ~, a= 9.147(1), b=23.054(2), c=6.921(1)A, V= 1459.5(3)A 3, Z=4, Dm=l'53(1), Dx= 1.531Mgm -3, MoKa, 2=0.7107A, #=0.12mm -1, F(000)= 712, T= 300K, R =0.055 for 1623 observed independent reflexions. The galactopyranose ring adopts a 4C l conformation and the dihedral angle between the two rings in the molecule is...
Uploaded on: December 5, 2022 -
December 12, 2017 (v1)Publication
Ba2+.C3H3NO2S2-.3H2 O, Mr=340.6 , triclinic, P1, a = 7.906 (1), b = 7.905 (1), c = 8.000 (1) A, ct= 96.34 (1), fl= 100.08 (1), 7= 93.54 (1)% V= 487.6 (1)A 3, Z- 2, Din= 2.31 (1), D x = 2.320 Mg m -3, 2(Mo Kct) = 0.7107/k, # = 4.47mm -1, F(000)=324, room temperature, final R = 0.044 (wR = 0.050) for 3235 observed reflexions. The anionic group is...
Uploaded on: December 4, 2022 -
December 12, 2017 (v1)Publication
C 1oH15N 307.3H20, M,= 343·3, monoclinic, P21, a= 10·883 (3), b = 12·497 (20), e=rings for the two molecules are 80·9 (3) and 90·3 (3)0 • The molecules are linked by an extensive three10·553 (4)Á, {3= 91·05 (3)0 , V= 1435 (2)Á3 Z=4, dimensional hydrogen-bonding network, involving the Dm = 1·57 (2), Dx = 1·589 Mg m-3, Mo...
Uploaded on: March 27, 2023 -
December 13, 2017 (v1)Publication
M r = 421-30, monoclinic, P2~, a = 7.531 (1), b=8.148(4), c= 14. 625 (2) ,~, fl=97.14(1) °, V= 890.5 (5) ,~3, Z= 2, Din= 1.58 (1), Dx= 1.571 Mg m -3, Mo Kct, 2 = 0.7107 ,~,/~ = 2.42 mm -1, F(000)=432, T= 300 K, R =0.065 for 1672 observed independent reflexions. The sugar ring adopts a 4T 3 conformation and the dihedral angle in the...
Uploaded on: March 27, 2023 -
June 2, 2023 (v1)Publication
Kinetic and microstructural studies have been performed on Fe60-xCo18MnxNb6B16 (x = 0, 2, 4) alloys by using different techniques. Isothermal and non-isothermal kinetics agree describing the nanocrystallization as a strongly impinged growth process. Developed microstructure is similar for all the studied alloys. Nanocrystals are irregularly...
Uploaded on: June 3, 2023 -
January 26, 2016 (v1)Publication
The magnetocaloric effect of Fe76Cr8−xMoxCu1B15 (x =0,4) alloys is studied. Although the combined addition of Cr and Mo is more efficient in tuning the Curie temperature of the alloy, the Mo-free alloy presents a higher magnetocaloric response. The refrigerant capacity (RC) for the Mo-containing alloy is comparable to that of ...
Uploaded on: December 5, 2022 -
June 1, 2023 (v1)Publication
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 Al content, a nanocrystalline microstructure (fcc α-Al embedded in an amorphous matrix) is formed during the first...
Uploaded on: June 2, 2023 -
June 12, 2023 (v1)Publication
Nanocrystallization kinetics is analyzed in the frame of instantaneous growth approximation, which implies that the time required for a crystallite to reach its final size is negligible with respect to the time required for the nanocrystallization process. This approach strongly simplifies the kinetic analysis and allows us to obtain the...
Uploaded on: June 14, 2023