Electrical resistivity of the Al65Rh27Si8 2/1 cubic approximant

Koshikawa, Naokiyo; Yoda, Shinichi; Edagawa, Keiichi; Minoda, Ken; Tamura, Ryuji; Takeuchi, Shin

doi:10.1016/j.jnoncrysol.2003.12.005

Cited by 3 publications

(1 citation statement)

References 14 publications

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“…4(a), the TCR of the P-type Al-Ir is not sensitive to the annealing temperature, implying that equilibrium defects such as point defects are not the main sources of the electron scattering. Their resistivities are to be compared with those of other Al-based 1/0 approximants; q 300 K ¼ 800 mW cm for 1/0 Al 72 Cu 8 Ru 20 with a ¼ 7.7 [13], q 300 K ¼ 350 mW cm for 1/0 Al 2.7 Rh with a ¼ 7.7 [14], q 300 K ¼ 300 mW cm for 1/0 Al 65 Pd 30 Fe 5 with a ¼ 15.5, q 300 K ¼ 1000 mW cm for 1/0 Al 70 Pd 20 Fe 10 with 13.5 forms in a narrow single phase region; for instance, the single phase region of the Al--Pd--Fe 1/0 approximants is considerably wide [3]. The present results suggest that for chemically ordered 1/0 approximants the TCR has a positive value.…”

Section: Electrical Resistivitymentioning

confidence: 99%

Synthesis and superstructure of Al—Ir, Al—Ir—Pd crystalline approximants and their electrical resistivities

Oishi¹,

Nishimoto²,

Tamura³

2009

Zeitschrift Für Kristallographie - Crystalline Materials

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Crystalline approximant / Electrical resistivity / Al--Ir / Al--Ir--Pd Abstract. Chemically ordered Al 2.7 Ir and Al 64.5 Ir 22 Pd 13.5 1/0 approximants are prepared by two different methods and characterized by X-ray diffraction and transmission electron microscopy. Al 2.7 Ir possesses a primitive cubic lattice with a ¼ 15.345(6), whereas Al 64.5 Ir 22 Pd 13.5 has a face-centered cubic lattice with a ¼ 15.497(9). Examination of the samples prepared by two different methods reveals that the texture of the samples prepared by spark plasma sintering is more homogeneous than those prepared by arc melting. Electrical resistivities of both the compounds exhibit metallic characters, i.e., a positive temperature coefficient of the resistivity (TCR) with a high resistivity value. The results suggest that the TCR may not always be negative for 1/0 approximants with 15$16 periodicity but the high residual resistivities are common to all the approximants, which is presumably attributed to the common structural unit, an icosahedral cluster of $7.7.

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Section: Electrical Resistivitymentioning

confidence: 99%