Magnetic properties and magnetic structure of HoFe11Ti and its hydrides

Apostolov, A.; Bezdushnyi, R.; Stanev, N.; Damianova, R.; Fruchart, D.; Soubeyroux, J.L.; Isnard, O.

doi:10.1016/s0925-8388(97)00290-9

Cited by 18 publications

(12 citation statements)

References 7 publications

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“…In this structure, the iron atoms occupy three inequivalent crystallographic sites, the 8f, 8i, and 8j sites, and the erbium occupies the 2a site. The titanium atoms are found 12,26,27 only on the 8i site, the largest of the three iron sites. Neutron diffraction investigations 12,27 indicate that the hydrogen is inserted into the 2b site, an octahedral site with two erbium and four 8j near neighbors.…”

Section: Structural and Magnetic Resultsmentioning

confidence: 97%

Magnetic and Mössbauer spectral study of ErFe11Ti and ErFe11TiH

Piquer

Hermann

Grandjean

et al. 2003

Journal of Applied Physics

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X-ray diffraction, isothermal magnetization at 5 and 300 K, ac magnetic susceptibility measurements between 5 and 200 K, and iron-57 Mössbauer spectral measurements between 4.2 and 295 K have been carried out on ErFe 11 Ti and ErFe 11 TiH. Hydrogen uptake has been measured by gravimetric analysis and the insertion of hydrogen into ErFe 11 Ti increases its magnetization, magnetic hyperfine fields, and isomer shifts as a result of the associated lattice expansion. Peaks and steplike changes in both the real and imaginary components of the ac magnetic susceptibility are observed at ϳ50 and 40 K for ErFe 11 Ti and ErFe 11 TiH, respectively, and are assigned to spin-reorientation transitions resulting from the temperature dependence of the sixth-order Stevens crystal-field term of erbium. The Mössbauer spectra have been analyzed with a model which considers both these spin reorientations and the distribution of titanium atoms in the near-neighbor environment of the three crystallographically distinct iron sites. The assignment and the temperature dependencies of the hyperfine fields and isomer shifts are in complete agreement with the WignerSeitz cell analysis of the three iron sites in ErFe 11 Ti and ErFe 11 TiH. The changes in the hyperfine field and isomer shift with the number of titanium near neighbors of the three iron sites are in agreement with the values observed for related titanium-iron intermetallic compounds.

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Section: Structural and Magnetic Resultsmentioning

confidence: 97%

Magnetic and Mössbauer spectral study of ErFe11Ti and ErFe11TiH

Piquer

Hermann

Grandjean

et al. 2003

Journal of Applied Physics

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“…1. Because of a most favorable heat of formation of Fe-Ti than Ho-Ti binaries, the Ti atoms occupy preferentially the 8i sites [3]. Moreover since the atomic site of 8f has the smallest volume reference to those of 8i and 8j sites, the Co atoms for increasing Co content occupy 8f sites, however then they occupy 8j and 8i sites, respectively to form energetically favorable Co-Ho bonds Table 1 Crystal lattice parameters a and c, unit cell volume V, and saturation magnetization for the HoFe 11−x Co x Ti (x = 1, 2, 4, 6, 7, 11) compounds and their hydrides at room temperature [16].…”

Section: Cell Parameter Analysismentioning

confidence: 99%

“…During the past 10 years, large efforts were devoted to the 1:12 type hydrides, more particularly on the characterization of RFe 11 TiH systems [1][2][3][4][5]. Parallel, the effect of Co substitution for Fe on the magnetic properties of RFe 11−x M x series were studied as well [6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Influence of hydrogenation on structure and magnetic properties of HoFe11−xCoxTi

Tajabor

Alinejad

Motevalizadeh

et al. 2008

Journal of Alloys and Compounds

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“…Among the RFe 11 Ti compounds, where R is a rare earth, that crystallize in the ThMn 12 I4/mmm tetragonal structure [1][2][3][4][5][6][7][8], SmFe 11 Ti, GdFe 11 Ti, and LuFe 11 Ti exhibit [9] an axial magnetic anisotropy, an anisotropy, which is preserved [8][9][10][11][12] in their hydrides. The same behavior is observed [13] in CeFe 11 Ti and its hydride.…”

Section: Introductionmentioning

confidence: 99%