Thermal expansion anomalies and spontaneous magnetostriction in R2Fe17Cx intermetallic compounds

Андреев, А.В.; Boer, F.R. de; Jacobs, T.H.; Buschow, K.H.J.

doi:10.1016/0921-4526(91)90071-l

Cited by 52 publications

(37 citation statements)

References 12 publications

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“…20 R 2 Fe 17 is a well-suited system to study 3d and 4f magnetism and the interplay between them, as the members of this family exhibit different ferro-, antiferro-, ferri-, helimagnetism, and fan magnetic structures as well as spin reorientation transitions, depending on the rare-earth element. [21][22][23][24][25] These R 2 Fe 17 intermetallic compounds have attracted considerable attention since the discovery in the 1990's that interstitial C and N atoms provoke an increase of the Curie temperature (T C ) and modify the character of the magnetocrystalline anisotropy, 26,27 making some of them appropriate for use as permanent magnets. 28 Nowadays, the existence of complex magnetic behaviors, including spin reorientations and first-order magnetic phase transitions, and the moderate MCE exhibited by some compounds have renewed the interest in these intermetallics.…”

Section: Introductionmentioning

confidence: 99%

Magnetovolume and magnetocaloric effects in Er2Fe17

et al. 2012

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Combining different experimental techniques, investigations in hexagonal P 6 3 /mmc Er 2 Fe 17 show remarkable magnetovolume anomalies below the Curie temperature, T C . The spontaneous magnetostriction reaches 1.6 × 10 −2 at 5 K and falls to zero well above T C , owing to short-range magnetic correlations. Moreover, Er 2 Fe 17 exhibits direct and inverse magnetocaloric effects (MCE) with moderate isothermal magnetic entropy S M , and adiabatic temperature T ad changes [ S M ∼ −4.7 J(kgK) −1 and T ad ∼ 2.5 K near the T C , and S M ∼ 1.3 J(kgK)and T ad ∼ −0.6 K at 40 K for H = 80 kOe, respectively, determined from magnetization measurements].The existence of an inverse MCE seems to be related to a crystalline electric field-level crossover in the Er sublattice and the ferrimagnetic arrangement between the magnetic moments of the Er and Fe sublattice. The main trends found experimentally for the temperature dependence of S M and T ad as well as for the atomic magnetic moments are qualitatively well described considering a mean-field Hamiltonian that incorporates both crystalline electric field and exchange interactions. S M (T ) and T ad (T ) curves are essentially zero at ∼150 K, the temperature where the transition from direct to inverse MCE occurs. A possible interplay between the MCE and the magnetovolume anomalies is also discussed.

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Section: Introductionmentioning

confidence: 99%

Magnetovolume and magnetocaloric effects in Er2Fe17

et al. 2012

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“…5 as triangles. For comparison purposes, the thermal expansion at the temperatures up to 750 K calculated according to the X-ray analysis data 15,16 is presented on the same diagrams as filled circles.…”

Section: Thermal Expansionmentioning

confidence: 99%

“…It is seen that the thermal expansion detected by the direct measurements and calculated from the indirect measurements coincide precisely in the temperature range of 100-350 K. At the temperatures higher than the Debye temperature ðT D Þ, the thermal expansion has a linear behaviour that allows to extract the phonon contribution ðD'='Þ ph using the Debye theory with two parameters (inclination of the line and T D ) taking into account the value of the Debye temperature T D ¼ 440 K. 15 The phonon contributions are shown in Fig. 5 were found by subtracting ðD'='Þ ph from the experimental values of the thermal expansion ðD'='Þ.…”

Section: Thermal Expansionmentioning

confidence: 99%

“…Both positive and negative exchange interactions occur in the iron sublattice, 10 which in some cases causes the appearance of the noncollinear antiferromagnetic structure 11,12 and invar behaviour of the thermal expansion. [13][14][15][16] It is known that extremely high values of the DM effect (the magnetization change due to the pressure change) 17,18 and the forced magnetostriction [19][20][21] are caused by the strong dependence of the exchange interaction and the width of the 3d-electron energy band on the unit cell volume and the interatomic distance. The high values of the DM effect and the magnetostriction are explained by the unit cell deformations due to the magnetization increase at the forced magnetization.…”

Section: Introductionmentioning

confidence: 99%

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Giant volume magnetostriction in the Y2Fe17 single crystal at room temperature

Никитин

Pankratov

Smarzhevskaya

et al. 2015

Journal of Applied Physics

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An investigation of the Y 2 Fe 17 compound belonging to the class of intermetallic alloys of rareearth and 3d-transition metals is presented. The magnetization, magnetostriction, and thermal expansion of the Y 2 Fe 17 single crystal were studied. The forced magnetostriction and magnetostriction constants were investigated in the temperature range of the magnetic ordering close to the room temperature. The giant field induced volume magnetostriction was discovered in the room temperature region in the magnetic field up to 1.2 T. The contributions of both anisotropic singleion and isotropic pair exchange interactions to the volume magnetostriction and magnetostriction constants were determined. The experimental results were interpreted within the framework of the Standard Theory of Magnetostriction and the Landau thermodynamic theory. It was found out that the giant values of the volume magnetostriction were caused by the strong dependence of the 3d-electron Coulomb charge repulsion on the deformations and width of the 3d-electron energy band.

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“…Many investigations have shown that T C of R 2 Fe 17 can be increased considerably by substitution of a variety of other elements on the Fe sites [4]. The substitution (or interstitial introduction by light elements) modifies also the magnetoelastic properties and their influence on the thermal expansion [5].…”

Section: Introductionmentioning

confidence: 99%

Spontaneous Magnetostriction of Lu₂Fe_17-xSi_x

Андреев

Daniš

2008

Acta Phys. Pol. A

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Thermal expansion of Lu 2 Fe 17−x Si x solid solutions was measured by X-ray powder diffraction. The magnetic ordering in all compounds within the homogeneity range (x ≤ 3.4) is accompanied by a large spontaneous volume magnetostriction distributed anisotropically over the principal axes of the hexagonal crystal structure. The volume effect ω s in the ground state reaches 14.7 × 10 −3 in Lu 2 Fe 17 and decreases monotonously to 8.9 × 10 −3 at x = 3.4 following the reduction of magnetic moment. Despite still large ω s , the Invar behavior observed in Lu 2 Fe 17 changes to a positive thermal expansion for x > 1 due to increasing Curie temperature.

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Thermal expansion anomalies and spontaneous magnetostriction in R2Fe17Cx intermetallic compounds

Cited by 52 publications

References 12 publications

Magnetovolume and magnetocaloric effects in Er2Fe17

Magnetovolume and magnetocaloric effects in Er2Fe17

Giant volume magnetostriction in the Y2Fe17 single crystal at room temperature

Spontaneous Magnetostriction of Lu₂Fe_17-xSi_x

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Thermal expansion anomalies and spontaneous magnetostriction in R2Fe17Cx intermetallic compounds

Cited by 52 publications

References 12 publications

Magnetovolume and magnetocaloric effects in Er2Fe17

Magnetovolume and magnetocaloric effects in Er2Fe17

Giant volume magnetostriction in the Y2Fe17 single crystal at room temperature

Spontaneous Magnetostriction of Lu2Fe17-xSix

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Product

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Spontaneous Magnetostriction of Lu₂Fe_17-xSi_x