Preparation and 57Fe Mössbauer study of PrCo3FeB, NdCo3FeB, SmCo3FeB and SmCo2Fe2B

Gros, Y.; Hartmann‐Boutron, F.; Meyer, C.; Frémy, M.A.; Tenaud, P.

doi:10.1016/0304-8853(88)90206-5

Cited by 19 publications

(21 citation statements)

References 8 publications

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“…Second, the spectra may be divided into three groups with very different spectral a͒ Electronic mail: fgrandjean@ulg.ac.be b͒ profiles, the first with x = 0.10 and 0.15, the second with x = 0.25, 1, and 2, and, the third with x = 2.5 and 2.6. Rather similar spectral profiles to those of the first two groups have been reported 6 by Gros et al in their study of various RCo 3 FeB compounds, where R is Pr, Nd, or Sm. Third, the spectrum of GdCo 3.80 Fe 0.20 B seems to be a combination of the spectra observed for x = 0.15 and 0.25.…”

Section: Mössbauer Spectral Analysissupporting

confidence: 84%

“…1 and 2 result from differing orientations of the magnetic moments and, hence, hyperfine fields of iron in the presence of large quadrupole interactions on the 2c and the 6i sites. A comparison of the earlier spectra 6 with the spectra shown in Figs. 1 and 2 indicates that at room temperature the GdCo 4−x Fe x B compounds exhibit an axial magnetization when x is 0.10, 0.15, 2.5, and 2.6, whereas they exhibit a basal magnetization when x is 0.25, 1, and 2.…”

Section: Mössbauer Spectral Analysismentioning

confidence: 96%

“…In the full Hamiltonian fits, the asymmetry parameter of the 2c and 6i sites has been constrained to 0 and 1, respectively, in agreement with the point symmetry of these sites. 6 The Euler angles and of the hyperfine field in the electric field gradient axes depend on the orientation of the iron magnetic moments in the unit cell. In the case of an axial orientation of the 2c iron magnetic moments, designated here as 2c ʈ , is 0°, whereas in the case of a basal orientation of the moments, designated here as 2c Ќ , and are 90 and 0°, respectively.…”

Section: Mössbauer Spectral Analysismentioning

confidence: 99%

“…The initial work 1 of Kuz'ma and Bilonizhko in 1974 has led to the preparation and study [2][3][4][5][6][7][8][9][10][11][12] of a variety of RCo 4−x Fe x B compounds in which R is yttrium or different rare earths and in which x can range in some cases from 0 to 4. These compounds are of interest because they can exhibit either axial or basal magnetic anisotropy that can change as a function of rare earth, composition, and/or temperature.…”

Section: Introductionmentioning

confidence: 99%

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A Mössbauer spectral study of the GdCo4−xFexB compounds

Grandjean

Hermann

Popiel

et al. 2007

Journal of Applied Physics

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The iron-57 Mössbauer spectra of the GdCo 4−x Fe x B compounds, where x is 0.10, 0.15, 0.20, 0.25, 1, 2, 2.5, and 2.6, have been measured at room temperature and reveal relatively small iron hyperfine fields of approximately 12-18 T, relatively large quadrupole interactions of approximately +0.9 and −1 mm/ s, and three very different types of spectra for x = 0.10 and 0.15, x = 0.25, 1, and 2, and x = 2.5 and 2.6. The differences result from both the different easy magnetization directions in these compounds and the different cobalt and/or iron occupancies of the crystallographic 2c and 6i sites. The spectra have been fitted by calculating the spectral absorption with the complete iron-57 nuclear excited state Hamiltonian for the iron 2c and 6i sites. The fits have used an asymmetry parameter and Euler angles and that relate the hyperfine field to the iron electric field gradient axes of each crystallographic site in an orientation that is consistent with the structural and magnetic properties of the site. The results of the fits indicate both that the full Hamiltonian approach is required for physically reasonable spectral fits and that the small observed fields result from the presence of large orbital contributions which subtract from the Fermi contact contributions to the magnetic hyperfine fields of the two sites. The iron 2c occupancy obtained from the Mössbauer spectral area has been used to model the compositional dependence of the magnetic anisotropy constant in the GdCo 4−x Fe x B compounds.

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Section: Mössbauer Spectral Analysissupporting

confidence: 84%

Section: Mössbauer Spectral Analysismentioning

confidence: 96%

Section: Mössbauer Spectral Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Mössbauer spectral study of the GdCo4−xFexB compounds

Grandjean

Hermann

Popiel

et al. 2007

Journal of Applied Physics

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“…Since the initial work of Kuzma et al, 5,8 many RM 4 B compounds, where R is yttrium or a rare earth and M is cobalt and iron, have been synthesized and studied in detail. [8][9][10][11][12][13][14][15][16][17] These compounds crystallize in the hexagonal P6 / mmm space group and exhibit either axial or basal magnetic anisotropy, an anisotropy that is influenced by temperature and/or composition. The boron occupies only one-half of the 2c site in the parent RCo 5 structure and, as a consequence, occupies the 2d site in the RCo 4 B-type structure.…”

Section: Introductionmentioning

confidence: 99%

A structural, magnetic, and Mössbauer spectral study of the DyCo4−xFexB compounds, with x=–3

Mayot

Isnard

Grandjean

et al. 2008

Journal of Applied Physics

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The DyCo4−xFexB compounds, with x=0, 1, 1.5, 2, 2.5, and 3, have been investigated by x-ray diffraction, magnetic measurements, and iron-57 Mössbauer spectroscopy. The substitution of cobalt by iron induces both an anisotropic increase in the unit-cell volume and a large increase in the Curie temperature. The 4.2K magnetization decreases with increasing iron content. The Mössbauer spectra of the DyCo4−xFexB compounds with x=1, 1.5, and 2 reveal rather small iron hyperfine fields of approximately 16T and large quadrupole interactions of +1.0 and −1.0mm∕s, for the 6i and 2c sites, respectively. The relative areas of the 6i and 2c spectral components indicate a strong preferential substitution of iron on the 2c site. In DyCo3FeB approximately 70% of the iron occupies the 2c site; a strong increase in the a lattice parameter and in the Curie temperature is observed between DyCo4B and DyCo3FeB and smaller increases are observed for x>1. The compensation temperature of the DyCo4−xFexB compounds decreases from 350to270K between x=0 and 3, respectively, as a result of the iron induced increase in the transition metal magnetization.

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Substitutional Metal Borides

Rogl¹

1991

Inorganic Reactions and Methods

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Preparation and 57Fe Mössbauer study of PrCo3FeB, NdCo3FeB, SmCo3FeB and SmCo2Fe2B

Cited by 19 publications

References 8 publications

A Mössbauer spectral study of the GdCo4−xFexB compounds

A Mössbauer spectral study of the GdCo4−xFexB compounds

A structural, magnetic, and Mössbauer spectral study of the DyCo4−xFexB compounds, with x=–3

Substitutional Metal Borides

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