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您的检索式：作者名="L.E.Zamora"
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| 1 | Systematic study of the dependence of magnetic and structural properties of Nd2Fe14B powders on the average particle size显示文摘A systematic study of the magnetic and structural properties dependence on the particle size was realized.For this,commercial NdFeB powder was separated into five different mean particle sizes using sieves.Besides,from the original powder,eleven samples were also produced by mechanical milling assisted by surfactant,using various milling times.A total of sixteen samples were studied by scanning electron microscopy(SEM),X-ray diffraction(XRD),vibrating sample magnetometry(VSM),and Mdssbauer spectrometry(MS).The particle sizes of the samples vary from the micrometer to the nanometer scale.The crystallite size decreases with decreasing particle size.XRD result indicates that the Nd2Fe14B phase is found in all the samples,and the presence of this phase is also corroborated by MS using six sextets for fitting their spectra,with an additional singlet corresponding to the Nd1.1Fe4B4 phase.The mean hyperfine magnetic field increases with increasing particle size because the magnetic dipolar interaction between the magnetic moment of the particles increases with particle size.From the VSM measurements the magnetic energy density(BH)max values were calculated for different particle sizes,and their maximum value of 34.45 MGOe is obtained for the sample with the particle size of 60μm. | J.F.Durán Perdomo G.A.Pérez Alcázar H.D.Colorado J.A.Tabares L.E.Zamora J.J.S.Garitaonandia | 2020 | Journal of Rare Earths2020，38，9： | 3 |
| 2 | Effect of cobalt substitution on structure and magnetic properties of Nd0.4Zr0.6Fe10-xCoxSi2(x =0-3) alloys and their ribbons显示文摘This study reports the stabilization of the RFe12-type based compounds where part of R and Fe are substituted with Zr and Co and Si, respectively, in order to examine whether these rare-earth-lean materials are suitable for applications as permanent magnets. Structural and magnetic characterization of the family of alloys with the general formula Nd0.4 Zr0.6 Fe10-xCoxSi2(x = 0 -3) and their melt-spun ribbons were carried out using X-ray diffraction and M€ossbauer spectroscopy. The ThMn12-type structure is obtained for all samples as the majority phase with a minority a-Fe(CoSi) phase(less than 5 wt%) as it was estimated by XRD for x = 1 and 2. The Curie temperature increases linearly with Co substitution from 561 K for x = 0 to 712 K for x = 3. The saturation magnetization decreases slightly from 130.5(x =1)to 129.1 A·m2/kg(x=3), while the anisotropy field is following the same trend. | M.Gjoka C.Sarafidis G.Giannopoulos D.Niarchos G.Hadjipanayis J.A.Tabares G.A.Pérez Alcázar L.E.Zamora | 2019 | Journal of Rare Earths2019，37，10： | 0 |
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