Publication

On electronic properties of Al/4Mn quasicrystals in melt-spun Al-Mn alloys

Davor Pavuna
1986
Journal Articles

Abstract

We present the resitivity and structural studies of the melt-spun Al-Mn alloys (with 10-18 at% Mn) that contain more than 50 vol% of the quasicrystalline (qX) Al//4Mn phase. The resistivity varies little with temperature up to approximately 600 K where it reveals structural transformations in the samples. Its magnitude is directly proportional to the overal percentage of Mn in each alloy. Simple theoretical considerations enable us to estimate the resistivity of the qX phase to be approximately 150 mu OMEGA . cm. High resitivity and high (meta)stability of quasicrystals can be understood within Friedel model of virtual bound states.

Official source

https://infoscience.epfl.ch/entities/publication/e27c4a12-5127-4b0c-840b-d57a26738396

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Davor Pavuna
1986
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/e27c4a12-5127-4b0c-840b-d57a26738396

About this result

Related concepts (27)

Manganese

Manganese is a chemical element with the symbol Mn and atomic number 25. It is a hard, brittle, silvery metal, often found in minerals in combination with iron. Manganese is a transition metal with a multifaceted array of industrial alloy uses, particularly in stainless steels. It improves strength, workability, and resistance to wear. Manganese oxide is used as an oxidising agent; as a rubber additive; and in glass making, fertilisers, and ceramics. Manganese sulfate can be used as a fungicide.

Proportional representation

Proportional representation (PR) refers to a type of electoral system under which subgroups of an electorate are reflected proportionately in the elected body. The concept applies mainly to political divisions (political parties) among voters. The essence of such systems is that all votes cast - or almost all votes cast - contribute to the result and are effectively used to help elect someone - not just a bare plurality or (exclusively) the majority - and that the system produces mixed, balanced representation reflecting how votes are cast.

Mixed-member proportional representation

Mixed-member proportional representation (MMP or MMPR) is a mixed electoral system in which votes are cast for both local elections and also for overall party vote tallies, which are used to allocate additional members to produce or deepen overall proportional representation. In some MMP systems, voters get two votes: one to decide the representative for their single-seat constituency, and one for a political party. In Denmark and others, the single vote cast by the voter is used for both the local election (in a multi-member or single-seat district), and for the overall top-up.

Related publications (9)

On electronic properties of Al/4Mn quasicrystals in melt-spun Al-Mn alloys

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