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  • 1
    Electronic Resource
    Electronic Resource
    Aluminum-gallium substitution in zeolite Li-A(BW) (1988)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 92 (1988), S. 3586-3588 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100323a052
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  • 2
    Electronic Resource
    Electronic Resource
    Neutron-diffraction and Mössbauer effect study of the preferential silicon site occupation and magnetic structure of Nd2Fe14−xSixB (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 6798-6809 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A neutron-diffraction study of Nd2Fe14−xSixB has shown that silicon preferentially occupies the 4c site in the transition-metal sublattice in Nd2Fe14B. Silicon also exhibits a moderate preference for the 8j1 site, is almost excluded from the 16k2 site, and avoids the 16k1, 8j2, and 4e sites. The silicon site occupancy is correlated with a preference for a silicon atom to have rare-earth atoms in its coordination environment. The Mössbauer spectra of Nd2Fe14−xSixB have been fit with a model which takes into account the distribution of near-neighbor environments of an iron atom due to the presence of silicon. These fits show that the substitution of silicon in the near-neighbor environment of an iron atom primarily influences the long-range contributions to the hyperfine field experienced by the iron. The mechanism for the increase in the Curie temperature when silicon is added to Nd2Fe14B-type magnets is more subtle than previously believed, but can be explained by the relative decrease in the proportion of short iron-iron bonds when silicon is substituted for iron.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355080
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  • 3
    Electronic Resource
    Electronic Resource
    Neutron diffraction and Mössbauer effect study of several Nd2Fe17−xAlx solid solutions : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6029-6031 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Aluminum-substituted Nd2Fe17−xAlx solid solutions with x=2.30, 4.44, 6.13, 8.00, and 9.40 have been studied by neutron diffraction and Mössbauer spectroscopy. A Rietveld analysis of the neutron scattering indicates that the aluminum atoms have a high initial affinity for the 18h site, show a high affinity for the 6c site at high aluminum concentrations, and are absent from the 9d site at all aluminum concentrations. The Mössbauer spectra show a maximum in both the maximum and weighted average hyperfine field for x≈2. This indicates that the lattice expansion which occurs with aluminum substitution is sufficient, at least for small values of x, where magnetic dilution is small, to enhance the intrasublattice coupling between the iron moments, and to increase the magnetic hyperfine fields.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353459
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  • 4
    Electronic Resource
    Electronic Resource
    Neutron-diffraction and Mössbauer-effect studies of Pr2(Fe1−xMnx)14B (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4762-4764 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A neutron-diffraction investigation of a series of Pr2(Fe1−xMnx)14B samples, with x values of 0.00, 0.11, 0.22, 0.30, and 0.35, reveals a preference for the manganese to occupy the 8j2 transition-metal site,the transition-metal site with the largest Wigner–Seitz cell volume. Similar site occupancies have been reported previously for Er2(Fe1−xMnx)14B and Y2(Fe1−xMnx)14B. An analysis of the 295-K Mössbauer spectrum of Pr2(Fe0.89Mn0.11)14B indicates that the internal hyperfine fields on the six iron sites are more substantially reduced from those found in Pr2Fe14B than would be expected from a simple magnetic dilution with manganese. The extent of the field reduction for a specific site increases with the number of manganese near neighbors for the site. Fits of the Mössbauer spectra of Pr2(Fe0.78Mn0.22)14B, Pr2(Fe0.70Mn0.30)14B, and Pr2(Fe0.65Mn0.35)14B, which are paramagnetic at room temperature, give quadrupole splittings consistent with the quadrupole interactions in Pr2Fe14B.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344778
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  • 5
    Electronic Resource
    Electronic Resource
    Electronic structure and magnetic properties of a new class of hard magnets: R2Fe17Nx(abstract) : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6036-6036 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Recently discovered R2 Fe17Nx (R=rare earth, x∼3) compounds look promising as permanent-magnet materials. The addition of N to R2Fe17 compounds almost doubles their Curie temperatures.1 It also give rise to uniaxial anisotropy in the Sm compound. We have performed spin-polarized self-consistent electronic structure calculations in order to understand the magnetic properties. Neutron diffraction and photoemission measurements are used to obtain information on nitrogen site occupancies and electronic structure. For Y2Fe17N3, the calculated site-dependent Fe moments vary significantly from those for Y2Fe17 (up to ∼1.7 μB), and the total moment per cell agrees very well with experiment. The expansion of the lattice due to nitrogenation lowers the overlap among the Fe atoms in the ion-only planes thereby increasing their magnetic moments. This leads to an increase in their interatomic exchange interactions and hence the Curie temperature. The Fe atoms in the vicinity of the N atoms overlap strongly with the latter and thus their moments decrease.2
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350062
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  • 6
    Electronic Resource
    Electronic Resource
    A neutron diffraction and Mössbauer effect study of the magnetic structure of Y2(Fe1−xMnx)14B : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6149-6151 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic structures of a series of Y2(Fe1−xMnx)14B samples, with x equal to 0.03, 0.10, 0.25, and 0.37, have been studied by powder neutron diffraction and Mössbauer spectroscopy. Y2(Fe0.97Mn0.03)14B and Y2(Fe0.9Mn0.1)14B are ferromagnetic at both 295 and 85 K, Y2(Fe0.63Mn0.37)14B is paramagnetic at both 295 and 85 K, whereas Y2(Fe0.75Mn0.25)14B is paramagnetic at 295 K and is partially ordered at 78 K. The magnetic structure of Y2(Fe0.75Mn0.25)14B is explained in terms of the preferential Mn occupancy of the transition metal 8j2 site in the Y2Fe14B structure. Small amounts of Mn located in this site are very effective in disrupting the long-range ferromagnetic coupling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350025
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  • 7
    Electronic Resource
    Electronic Resource
    Crystal and magnetic structure of Er2(CoxFe1−x)17 compounds (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4641-4643 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Room-temperature neutron-diffraction spectra on compositions x=0.0, 0.20, 0.40, 0.55, 0.80, and 1.0 have been obtained and analyzed for crystal and magnetic structures. The crystal structures deviate from the ideal Th2Ni17 structures, as has been observed in the other hexagonal 2-17 materials. Structure analysis from the nuclear intensities at 350 K leads to a precise stoichiometry of Er1.91Fe18.25 in Er2Fe17. Because of the high Tc of the Co-rich compounds, the Er atoms align at relatively high temperature and the axial Er anisotropy dominates at room temperature. Only at x=0.4 composition is a spin reorientation from planar to axial observed below room temperature. The f site, which is analogous to the c site in rhombohedral Th2Zn17 and the j2 site in Re2Fe14B, does not support a moment as large as on the c site and j2 site in respective phases. The moment reduction is probably related to atomic defects on the dumbbell f site.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344839
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  • 8
    Electronic Resource
    Electronic Resource
    A neutron diffraction and Mössbauer effect study of the magnetic properties of Pr2Fe17 and Pr2Fe17N2.6 (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 504-512 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The neutron diffraction powder patterns of Pr2Fe17 and Pr2Fe17N2.6 have been measured at 295 K and refined within the Th2Zn17 structure type to give the structural changes which occur upon nitrogenation; changes which include a 6.4% expansion of the unit cell volume. The Mössbauer spectra of Pr2Fe17 and Pr2Fe17N2.6 have been measured between 85 and 295 K and analyzed with a model which is based on the Wigner–Seitz cell environment of each iron site, the basal orientation of the magnetization, and a comparison with the Mössbauer spectra of Nd2Fe17 and Nd2Fe17N2.6. Upon nitrogenation of Pr2Fe17, the 85 K-weighted average isomer shift increases from 0.049 to 0.156 mm/s, and the isomer shifts of the four crystallographically distinct iron sites increase in agreement with the increase found in their Wigner–Seitz cell volumes and the presence of a nitrogen near-neighbor for the 18f and 18h sites. The temperature dependence of the isomer shifts indicates an increase in covalency upon the formation of the nitride. Upon nitrogenation of Pr2Fe17, the 85 K-weighted average hyperfine field increases from 286.2 to 331.9 kOe, however, as is the case for the nitrogenation of Nd2Fe17, the increases on the 6c and 18f sites are much smaller than those observed on the 9d and 18h sites. These changes provide support for the band structure calculations of changes in the magnetic moments upon nitrogenation of Y2Fe17, Nd2Fe17, and Gd2Fe17.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355261
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  • 9
    Electronic Resource
    Electronic Resource
    Neutron powder diffraction study of Tb2Fe14B : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5884-5886 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report Rietveld analyses of neutron powder diffraction data on Tb2Fe14B at 8 and 293 K. Our results confirm the inferences from magnetization measurements that (i) all eight magnetic moments are collinear with the c axis, (ii) the Tb and Fe moments are antiparallel, and (iii) the Tb moments approach their free ion value at low temperatures. Systematics of the variation of the lattice constants and nuclear position parameters across the R2Fe14B series are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353510
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  • 10
    Electronic Resource
    Electronic Resource
    A neutron diffraction and Mössbauer effect study of the magnetic properties of Pr2Fe17 and Pr2Fe17N2.6 (invited) (abstract) : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6050-6050 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The neutron diffraction powder patterns of Pr2Fe17 and Pr2Fe17N2.6 have been measured at 295 K and refined within the Th2Zn17 structure type to give the structural changes which occur upon nitrogenation; changes which include a 6.4% expansion of the unit cell volume. The Mössbauer spectra of Pr2Fe17 and Pr2Fe17N2.6 have been measured between 85 and 295 K and analyzed with a model which is based on the Wigner–Seitz cell environment of each iron site, the basal orientation of the magnetization, and a comparison with the Mössbauer spectra of Nd2Fe17 and Nd2Fe17N2.6. Upon nitrogenation of Pr2Fe17, the 85-K-weighted average isomer shift increases from 0.049 to 0.156 mm/s, and the isomer shifts of the four crystallographically distinct iron sites increase in agreement with the increase found in their Wigner–Seitz cell volumes and the presence of a nitrogen near-neighbor for the 18f and 18h sites. The temperature dependence of the isomer shifts indicates an increase in covalency upon the formation of the nitride. Upon nitrogenation of Pr2Fe17, the 85-K-weighted average hyperfine field increases from 286.2 to 331.9 kOe, however, as is the case for the nitrogenation of Nd2Fe17, the increases on the 6c and 18f sites are much smaller than those observed on the 9d and 18h sites. These changes provide support for the band structure calculations of changes in the magnetic moments upon nitrogenation of Y2Fe17, Nd2Fe17, and Gd2Fe17.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354051
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