166Er and 57Fe Mössbauer effect in Er2Fe17Nx

Gubbens, P.C.M.; Moolenaar, A.A.; Boender, G. J.; Kraan, A.M. van der; Jacobs, T.H.; Buschow, K.H.J.

doi:10.1016/0304-8853(91)90162-4

Cited by 26 publications

(6 citation statements)

References 9 publications

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“…Measurements with 166 Er Mössbauer spectroscopy on Er 2 Fe 17 , Er 2 Fe 17 C and Er 2 Fe 17 N 2.7 give approximately the same type of results as studied by Gubbens et al (1991c).…”

Section: Rare Earth Mössbauer Spectroscopy Measurements On Lanthanidesupporting

confidence: 69%

Rare Earth Mössbauer Spectroscopy Measurements on Lanthanide Intermetallics

Gubbens

2012

Handbook of Magnetic Materials

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“…Measurements with 166 Er Mössbauer spectroscopy on Er 2 Fe 17 , Er 2 Fe 17 C and Er 2 Fe 17 N 2.7 give approximately the same type of results as studied by Gubbens et al (1991c).…”

Section: Rare Earth Mössbauer Spectroscopy Measurements On Lanthanidesupporting

confidence: 69%

Rare Earth Mössbauer Spectroscopy Measurements on Lanthanide Intermetallics

Gubbens

2012

Handbook of Magnetic Materials

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“…In the case of gadolinium, it was shown that carbon and nitrogen, [27][28][29] have an opposite effect on the crystal electric field gradient to that of hydrogen. 30 In the case of erbium and thulium, 166 Er and 169 Tm Mössbauer spectral measurements 3,31 have shown that the second-order crystal-field parameter A 2 0 becomes more negative upon carbon or nitrogen insertion into Er 2 Fe 17 and Tm 2 Fe 17 . Hence, because deuterium insertion suppresses the spin reorientation in Tm 2 Fe 17 , we can conclude that A 2 0 either becomes more positive or is essentially zero, as was observed 30 in…”

Section: Discussionmentioning

confidence: 99%

Magnetic and Mössbauer spectral evidence for the suppression of the magnetic spin reorientation inTm2Fe17by deuterium

2002

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The structural and magnetic properties of Tm 2 Fe 17 and Tm 2 Fe 17 D 3.2 are investigated by means of x-raydiffraction, thermal, and ac magnetic susceptibility measurements, and iron-57 Mössbauer spectroscopy. Both compounds crystallize in a hexagonal P6 3 /mmc space group with a Th 2 Ni 17 -like structure. Deuterium insertion into Tm 2 Fe 17 induces large increases in the unit-cell volume, the saturation magnetization, and the ordering temperature. The unit-cell expansion is anisotropic, with a larger increase in the a lattice parameter than the c lattice parameter. A spin reorientation is observed at 90 K in Tm 2 Fe 17 in the temperature dependence of both the ac susceptibility and the Mössbauer spectra. Above and below 90 K, the iron magnetic moments are aligned within the basal plane and along the c-axis, respectively. An analysis of the Mössbauer spectra from 4.2 to 320 K yields the orientation of the iron magnetic moments and hyperfine fields, relative to the axes of the electricfield gradient tensor at the iron sites. As revealed by both the ac susceptibility measurements and the Mössbauer spectra, deuterium insertion into Tm 2 Fe 17 suppresses this spin reorientation, and in Tm 2 Fe 17 D 3.2 the iron magnetic moments are oriented within the basal plane of the unit cell from 4.2 to 295 K. The spin reorientation in Tm 2 Fe 17 results from a competition between the thulium and iron magnetic anisotropies. Below 90 K the thulium anisotropy dominates and favors an axial alignment of the spins. In contrast to carbon and nitrogen, deuterium insertion into Tm 2 Fe 17 decreases the influence of the thulium anisotropy, and in Tm 2 Fe 17 D 3.2 the iron anisotropy dominates and favors a basal alignment of the magnetic moments.

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“…26 The value of the CEF coefficient A 20 is in agreement with the results of the Mössbauer effect in Er 2 Fe 17 , for which the average value A 20 ϷϪ50 Ϯ100Ka 0 Ϫ2 was found. 28 If we only take into account the second-order CEF term, a value of K 1,R ϭϩ7.0 K/f.u. can be derived on the basis of Eq.…”

Section: Magnetocrystalline Anisotropy and Magnetic Phase Transitionmentioning

confidence: 99%

Structure, exchange interactions, and magnetic phase transition ofEr2Fe17−x
Cheng
¹
,
Shen
²
,
Yan
³

et al. 1998
Phys. Rev. B
31
1
10
0
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We present the effect of aluminum substitution on the structure, exchange interactions, and magnetic phase transitions of the intermetallic compound Er 2 Fe 17 . All samples have a hexagonal Th 2 Ni 17 -type structure or a rhombohedral Th 2 Zn 17 -type structure. The replacement of Fe by Al results in an approximately linear increase in the unit-cell volumes at a rate of 9.3 Å 3 per Al atom. The Al atoms preferentially occupy 12k (18h) and 12j (18f ) sites at low Al concentration, while they prefer strongly to occupy 6c (4 f ) and 18f (12j) sites at high aluminum concentration. The Curie temperature is found to increase at first, form a maximum value at xϭ3, and then to decrease monotonically with increasing Al concentration. The exchange-coupling constant between 3d and 4 f sublattices, J RT , was obtained from fitting M -T curves for some of the samples. The intersublattice molecular-field coefficient n RT and hence the R-T exchange-coupling constant J RT have been also determined on the basis of magnetization curves at the compensation temperature. The exchange-coupling constant J RT shows almost no obvious composition dependence, while the exchange-coupling constant J TT is strongly dependent on the Al concentration. The composition dependence of the 3d sublattice exchange interaction is discussed in terms of bond lengths and atomic preferential occupancies. It is noteworthy that the substitution of Al has a significant effect on the magnetocrystalline anisotropies of both the Er sublattice and the Fe sublattice in Er 2 Fe 17Ϫx Al x compounds. The temperature and composition dependence of the easy magnetization direction suggests that the second-order crystal electric-field coefficient A 20 changes its sign from negative to positive with increasing Al concentration up to xϾ7. ͓S0163-1829͑98͒02721-0͔

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166Er and 57Fe Mössbauer effect in Er2Fe17Nx

Cited by 26 publications

References 9 publications

Rare Earth Mössbauer Spectroscopy Measurements on Lanthanide Intermetallics

Rare Earth Mössbauer Spectroscopy Measurements on Lanthanide Intermetallics

Magnetic and Mössbauer spectral evidence for the suppression of the magnetic spin reorientation inTm2Fe17by deuterium

Structure, exchange interactions, and magnetic phase transition ofEr2Fe17−x
Cheng
¹
,
Shen
²
,
Yan
³

et al. 1998
Phys. Rev. B
31
1
10
0
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166Er and 57Fe Mössbauer effect in Er2Fe17Nx

Cited by 26 publications

References 9 publications

Rare Earth Mössbauer Spectroscopy Measurements on Lanthanide Intermetallics

Rare Earth Mössbauer Spectroscopy Measurements on Lanthanide Intermetallics

Magnetic and Mössbauer spectral evidence for the suppression of the magnetic spin reorientation inTm2Fe17by deuterium

Structure, exchange interactions, and magnetic phase transition ofEr2Fe17−xCheng1, Shen2, Yan3 et al. 1998Phys. Rev. B311100View full textAdd to dashboardCite

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Structure, exchange interactions, and magnetic phase transition ofEr2Fe17−x
Cheng
¹
,
Shen
²
,
Yan
³

et al. 1998
Phys. Rev. B
31
1
10
0
View full text Add to dashboard Cite