Hall effect in Taylor-phase and decagonal Al3(Mn,Fe) complex intermetallics

Stanić, Denis; Ivkov, Jovica; Smontara, Ana; Jagličić, Zvonko; Dolinšek, J.; Heggen, Marc; Feuerbacher, M.

doi:10.1524/zkri.2009.1053

Cited by 3 publications

(3 citation statements)

References 8 publications

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“…The electrical resistivity and the Hall coefficient of the polygrain T-Al 3 Mn, T-Al 73 Mn 27−x Fe x ͑x =2,4͒ and the decagonal quasicrystal d-Al 73 Mn 21 Fe 6 were reported as well. 17 We also mention that the single crystal of composition Al 72.5 Mn 21.5 Fe 6.0 pertinent to this study was a Taylor phase, whereas the polycrystalline material of almost identical composition Al 73 Mn 21 Fe 6 reported in the preceding papers 15,17 was a decagonal quasicrystal. As discussed above, different annealing conditions may be the reason for this discrepancy.…”

Section: Structural Considerations and Sample Preparationmentioning

confidence: 56%

Anisotropic physical properties of the Taylor-phaseT-Al72.5Mn21.5Fe6.0com

et al. 2010

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We have investigated anisotropic physical properties ͑the magnetic susceptibility, the electrical resistivity, the thermoelectric power, the Hall coefficient and the thermal conductivity͒ of the single-crystalline Taylorphase T-Al 72.5 Mn 21.5 Fe 6.0 complex intermetallic that is an orthorhombic approximant to the d-Al-Mn-Pd decagonal quasicrystal. The measurements were performed along the a, b, and c directions of the orthorhombic unit cell, where ͑a , c͒ atomic planes are stacked along the perpendicular b direction. The T-Al 72.5 Mn 21.5 Fe 6.0 shows spin-glass behavior below the spin-freezing temperature T f Ϸ 29 K with a small anisotropy in the magnetic susceptibility. The anisotropic electrical resistivities are rather large and show negative temperature coefficient. The resistivity is lowest along the stacking direction, which appears to be a common property of the decagonal-approximant phases with a stacked-layer structure. The temperature-dependent resistivity was theoretically reproduced by the quantum transport theory of slow charge carriers. The thermopower is positive for all three crystallographic directions, indicating that holes are the majority charge carriers, and no anisotropy can be claimed within the experimental precision. The same conclusion on the holes being the dominant charge carriers follows from the Hall-coefficient measurements, which is a sum of the ͑positive͒ normal Hall coefficient and the anomalous term, originating from the magnetization. The anisotropy of the thermal conductivity is practically negligible. The T-Al 72.5 Mn 21.5 Fe 6.0 Taylor phase can be considered as a "close-to-isotropic" complex intermetallic. The relation of the anisotropic physical properties of the Taylor phase to other families of decagonal-approximant phases with the stacked-layer structure is discussed.

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Section: Structural Considerations and Sample Preparationmentioning

confidence: 56%

Anisotropic physical properties of the Taylor-phaseT-Al72.5Mn21.5Fe6.0com

et al. 2010

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“…The complex metallic alloys T-Al-Mn-Pd, T-Al-Mn-Pd and o-Al 13 Co 4 are highly interesting phases which provide exceptional structural [19][20][21], magnetic [22][23][24][25], and catalytic properties [26]. The plastic properties are very remarkable as well, as metadislocation motion, in contrast to most other complex metallic alloys, takes place by pure glide [1,2,6,7,8].…”

Section: Discussionmentioning

confidence: 99%

Metadislocations: The case of pure glide

Heggen

Feuerbacher

2013

MRS Proc.

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Metadislocations are highly complex and pivotal defects mediating plastic deformation in complex metallic alloys. Here, we review recent results on the structure of metadislocations in the phases T-Al-Mn-Pd, T-Al-Mn-Fe and o-Al 13 Co 4 . In these materials, metadislocation motion is of particular interest as it takes place by pure glide in contrast to most other complex metallic alloys. Recently, novel metadislocations were found in the T-phase [1]. They have Burgers vectors ( )(n = 2, 3, 4) and are associated to two, four and six planar defects, respectively. The type of planar defect depends on the deformation geometry. Metadislocation glide creates (1 0 0) stacking faults and climb creates (0 0 1) phason planes. Metadislocation glide was observed in the o-Al 13 Co 4 phase, as well [2]. The close structural relation of metadislocations in the phases T-Al-Mn-Pd, T-Al-Mn-Fe, Al 13 Co 4 and ε 6 -Al-Pd-Mn is discussed. INTRODUCTIONMetadislocations were first observed in the complex metallic alloy (CMA) phase ε 6 -Al-Pd-Mn [3], later in other ε-type phases in the systems Al-Pd-Mn [4] and Al-Pd-Fe [5] and also in other non ε-type phases like Al 13 Co 4 [7] and T-Al-Mn-Pd and T-Al-Mn-Fe [1,8].Metadislocations in the phases T-Al-Mn-Pd and T-Al-Mn-Fe are very special as they consist of a complex core and separated but inevitable phason defects which are referred to as escort defects. Upon deformation, the escort defects move ahead and locally transform the T-phase structure for accommodation of the metadislocation core. Metadislocation core and escort defects leave a slab of R-phase in their wake as they move. This mechanism of plastic deformation of a complex material is of special importance, as it provides one of few examples of metadislocation motion in terms of pure glide. Glide is the most common process of dislocation motion in simple materials, but in most complex phases investigated so far metadislocation motion takes place by pure climb. Climb is a non-conservative mode of motion which involves atomic transport. Metadislocation glide is thus a very special phenomenon as it bridges the gap between the mechanisms of plastic deformation in simple and complex alloys.In the present paper metadislocation motion in the phases T-Al-Mn-Pd and T-Al-Mn-Fe is reviewed. Furthermore we will discuss metadislocation motion in the phase Al 13 Co 4 , another example where metadislocations move by pure glide.

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“…The unit cell of the T-phase contains 156 atoms. Recently, ternary modifications of the T-phase were studied in Al-Mn-Pd and Al-Mn-Fe systems [7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

A Study of Phase Transformations in Complex Metallic Alloys Al73Mn23Pd4 and Al73Mn21Pd6

Priputen

Černičková

Kusý

et al. 2011

KEM

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The microstructure characterization of Al73Mn23Pd4 and Al73Mn21Pd6 alloys was done after annealing at 900°C for 312 h and subsequent water quenching, as well as after thermal cycling. DTA and EDX/WDX/SEM techniques were used in the investigation. It was found out that the alloys consist of the single ternary T-phase after annealing and water quenching. The DTA experiment confirmed the stability of this phase also at lower temperatures. After DTA, the alloys exhibited double-phase microstructure consisting of the ternary T-phase and probably the icosahedral I-phase. It was proved an incongruent transformation of the ternary T-phase into the liquid and vice versa.

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Hall effect in Taylor-phase and decagonal Al₃(Mn,Fe) complex intermetallics

Cited by 3 publications

References 8 publications

Anisotropic physical properties of the Taylor-phaseT-Al72.5Mn21.5Fe6.0com

Anisotropic physical properties of the Taylor-phaseT-Al72.5Mn21.5Fe6.0com

Metadislocations: The case of pure glide

A Study of Phase Transformations in Complex Metallic Alloys Al<sub>73</sub>Mn<sub>23</sub>Pd<sub>4</sub> and Al<sub>73</sub>Mn<sub>21</sub>Pd<sub>6</sub>

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