Structural, tribological and resistivity studies of Ga substituted (Al71-xGax) Pd21Mn8 icosahedral and other intermetallic phases

被引：8

作者：

Bohra, Murtaza ^{[1
]}

de Weerd, M. C. ^{[1
]}

Fournee, Vincent ^{[1
]}

Mandal, R. K. ^{[2
]}

Mukhopadhyay, N. K. ^{[2
]}

Chatterjee, Ratnamala ^{[3
]}

Sastry, G. V. S. ^{[2
]}

机构：

[1] Nancy Univ, Inst Jean Lamour, CNRS UMR7198, UPV Metz,Ecole Mines Nancy, F-54042 Nancy, France

[2] Banaras Hindu Univ, Dept Met Engn, Ctr Adv Study, Indian Inst Technol, Varanasi 221005, Uttar Pradesh, India

[3] IIT Delhi, Dept Phys, New Delhi 110016, India

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2013年 / 551卷

关键词：

Icosahedral quasicrystals; Tribology; Resistivity; Powder metallurgy; QUASI-CRYSTALLINE; BEHAVIOR; GROWTH;

D O I：

10.1016/j.jallcom.2012.09.130

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We report the formation of icosahedral phase in Al-71 xGaxPd21Mn8 (x = 0, 4, 6, 8, and 10 at.%) by adopting powder metallurgical route. Such a variation in Ga substitution in the alloy composition gave rise to a nearly single phase face centred icosahedral phase for x = 6. All other Ga substituted compositions displayed formation of intermetallic phases in addition to the icosahedral quasicrystals. The 6d hypercubic lattice parameter for the Ga substituted icosahedral phase is higher than that of Al71Pd21Mn8 composition. The change in the lattice parameter is non-monotonic. Such a change in lattice parameter has been explained based on the mixed valence states of Ga on Al site. The electrical resistivity of x = 6 sample is comparable to those of earlier studies pertaining to flux grown icosahedral composition of Al(Ga) PdMn alloy. Further, x = 6 sample has displayed highest value of static friction coefficient. This has been understood in terms of the shift of Fermi level from the pseudo-gap location owing to mixed valence states of Ga. (C) 2012 Elsevier B. V. All rights reserved.

引用

页码：274 / 278

页数：5

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