Magnetoelastic behaviour of dilute chromium alloys

Munday, B C

doi:10.1002/pssa.2210080249

Cited by 8 publications

(4 citation statements)

References 5 publications

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“…Unfortunately the magnetovolume has been reported up to now only for Cr-Pt and Cr-Ir polycrystalline alloys and one does not know whether similar interesting behaviour-a sharp and large maximum in α-T at T I C , where α is the coefficient of thermal expansion, and a sharp and large minimum at T N due to the effects of the SDW-is also characteristic of the other alloy systems mentioned above. The B-T curves of polycrystalline Cr-Pt [4], Cr-Ru [6] and Cr-Ir [3] show large minima at T N , as is also observed for Young's modulus for Cr-Rh [5]. The B-T behaviour at T I C is however different.…”

Section: Introductionsupporting

confidence: 56%

“…0953-8984/97/163461+18$19.50 c 1997 IOP Publishing Ltd Most existing magnetoelastic studies on dilute Cr alloys with group-8 non-magnetic transition metals were done on polycrystalline material and were reported for Cr-Pt [4], Cr-Ru [5,6], Cr-Ir [3] and Cr-Rh [5] alloys. These studies show interesting behaviour in the temperature dependence of the elastic constants, the bulk modulus (B) and shear modulus (G), or in the Young's modulus, and in the case of Cr-Pt and Cr-Ir also of the magnetovolume, when these alloys are taken through the above-described magnetic phase transition temperatures.…”

Section: Introductionmentioning

confidence: 99%

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Magnetoelasticity of dilute Cr - Ir alloy single crystals

Martynova¹,

Alberts²,

Smit³

1997

J. Phys.: Condens. Matter

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Measurements are reported of the temperature dependence of the elastic constants, ultrasonic attenuation and thermal expansion of dilute Cr - Ir alloy single crystals containing 0.07, 0.17, 0.20 and 0.25 at.% Ir. Well defined magnetic anomalies were observed in the elastic constants and in the thermal expansion at the Néel points and at the incommensurate - commensurate (I - C) spin-density-wave (SDW) transition temperatures . The transition at , observed in Cr + 0.20 at.% Ir and Cr + 0.25 at.% Ir, is hysteretic, of hysteresis width about 20 K. Magnetic anomalies were also observed in the elastic constants at the spin-flip transition temperature , The attenuation coefficient shows a large spike-like peak at (on heating) and at (on cooling) for Cr + 0.20 at.% Ir. These peaks are however smeared out by inhomogeneities in the crystal containing 0.25 at.% Ir. The attenuation coefficient peaks at and in Cr + 0.07 at.% Ir and in Cr + 0.17 at.% Ir. Due to very large attenuation and the high value of could not be measured successfully around the Néel point for the other crystals. The magnetovolume and magnetic contributions to the bulk modulus (B) have been found to fit the equation , predicted by theory, rather well up to temperatures (T) close to . The volume derivative of calculated from and for Cr + 0.07 at.% Ir, compares fairly well with the value obtained from high-pressure measurements. High-pressure measurements are not available for the other crystals for a similar comparison. The temperature dependence of for Cr + 0.17 at.% Ir fits the power law , predicted by theory for T just above , rather well. The theory however fails in the case of Cr + 0.07 at.% Ir and could not be tested for the other two crystals.

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Section: Introductionsupporting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Magnetoelasticity of dilute Cr - Ir alloy single crystals

Martynova¹,

Alberts²,

Smit³

1997

J. Phys.: Condens. Matter

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“…This is about the same concentration as that in the alloy for which the temperature dependence of the thermal expansion is shown in figure 2(b), which indicates that this broad deep minimum in Y ( T ) does indeed result from the coalescence of minima at TN and T , . Munday (1971) found similar behaviour for Y(T) in a Cr,-,Re, alloy having 2 = 0.30 at.% Re, and in a Cr,-,Rh, alloy having z = 0.30 at.% Rh, while…”

Section: Discussionmentioning

confidence: 52%

“…In Cr,-,Ru,, two alloys having z > zL = 0.16 a t % Ru (Butylenko and Nevdacha, 1980) show well resolved anomalies at both TN and TI, in the bulk modulus (figures 2(b) and 2(e)) as well as the thermal expansion (figures 2(c) and 2(d)). The data of Munday (1971) for the temperature dependence of the Young's modulus Y ( T ) of CrRu alloys show a sharp minimum for I = 0.15 at.% Ru, essentially the triple-pint concentration, and much a deeper and broader minimum for z = 0.27 a t % Ru. This is about the same concentration as that in the alloy for which the temperature dependence of the thermal expansion is shown in figure 2(b), which indicates that this broad deep minimum in Y ( T ) does indeed result from the coalescence of minima at TN and T , .…”

Section: Discussionmentioning

confidence: 92%

Magnetoelastic anomalies in spin-density-wave Cr alloys

Fawcett¹,

Alberts²

1992

J. Phys.: Condens. Matter

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Measurements of the thermal expansion and elastic constants of dilute antiferromagnetic Cr alloys are reviewed and analysed to obtain the strain dependence of characteristic temperatures (energies) for the Neel transition and the phase transition between the incommensurate (I) and commensurate (C) spin-density-wave (SDW) phases. The results are related where possible to the behaviour of the transition temperatures under pressure, which correspond normally to positive and negative volume dependence, respectively, of the Neel temperature TN and the IC SDW phase transition temperature TIC, as indicated by the minimum at TN and maximum at TIC in the temperature dependence of the thermal expansivity. The unique anomaly in the temperature dependence of the shear strain modulus in CrRu alloys is analysed along the same lines.

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Thermal expansivity and elastic constants of CrFe alloys

Hausch

Torok

1977

Phys. Stat. Sol. (a)

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The thermal expansion and the elastic moduli of polycrystalline CrFe alloys containing 1·95, 2·6, 3·8, 6·65, 24·9, and 38·7 at% Fe are measured as a function of temperature. Large anomalies are observed in both properties at the Néel temperature TN for those alloys which order anti‐ferromagnetically. From the thermal expansion curves the spontaneous volume magnetostriction ωm is determined which is highest for the Cr‐2.6 at% Fe alloy (ωm = 3.6 × 10−3). For antiferro‐magnetic alloys Young's modulus exhibits a strong λ‐type anomaly at TN while for the shear modulus no critical behaviour is observed. The largest anomaly occurs for the bulk modulus of the Cr‐3.8 at% Fe alloy where the modulus drops almost to zero at TN.

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Magnetoelastic behaviour of dilute chromium alloys

Cited by 8 publications

References 5 publications

Magnetoelasticity of dilute Cr - Ir alloy single crystals

Magnetoelasticity of dilute Cr - Ir alloy single crystals

Magnetoelastic anomalies in spin-density-wave Cr alloys

Thermal expansivity and elastic constants of CrFe alloys

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