Comment on "Atomic jumps in quasiperiodic Al72.6_{72.6}Ni10.5_{10.5}Co16.9_{16.9} and related crystalline material"

We disagree with a number of statements by Dolinsek et al. about the specificity of phason dynamics in quasicrystals (QCs).Comment: 2 pages, 0 figures, submitted to Physical Review

On the origin of the giant magnetic moment of the Al-Mn quasicrystals

Ab initio calculations of magnetic moments for icosahedral clusters contained in crystal structures Al10Mn3, Al5Co2, Al17Mn4 (Al13Cr4Si4-type) fulfilled in the framework of Density Functional Theory. The AlMn cluster having the trigonal D3h symmetry with the triangle of Mn ions in the interior has the moment being equal to three magnetic moments of a single manganese ion (4.4 μB), the moment of the tetrahedral Td cluster with the Mn tetrahedron in the interior is equal approximately to twelve magnetic moments of the single manganese ion (15.5 μB). The magnetic moment of icosahedral Al-Co clusters having the same configuration is equal to zero. The magnetic moments of the rod assembled from the icosahedral clusters with the sequence Td D3h - Td was found to be 20.5 μB. This value permits to explain the giant magnetic moment of icosahedral and decagonal Al-Mn quasicrystals and gives the indirect evidence to the hierarchical model of the quasicrystals structure proposed by the authors recently. An arrangement of magnetic moment carriers in the interior of the aluminum shell of icosahedral clusters permits to suggest the interaction between contacting manganese ions as the main origin of the giant magnetic moment of the Al-Mn quasicrystals

An application of a polytope (4D-polyhedron) concept for the description of polymorphic transitions: Iron martensite and solid oxygen

A polymorphic transformation between BCC and FCC phases can be described in the framework of the root lattice E$_8$ in a 8D-space as the hypothetical praphase with symmetry group playing a role of the supergroup for both participants of the transformation. The special subset of vectors of the E$_8$ and coinciding topologically with the unit cell of the A15 structure (Cr$_3$Si-type) in the 3D Euclidian space was found, this subset can be regarded as an intermediate configuration during transformation between FCC and BCC structures. The proposed description of the polymorphic transformation is supported by experimentally observed habite planes of martensite in iron based alloys and by the existence ofthe A15-phase in the solid oxygen

Relationship between special features of microstructure and characteristics of heat and mass transfer in Armco iron in laser heating

22.00; Translated from Russian (Fiz. Khim. Obrab. Mater. 1989 v. 23(1) p. 32-37)Available from British Library Document Supply Centre- DSC:9023.19(VR-Trans--4388)T / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo

Features of magnetron sputtering of films of alloy Co-20%Cr

Translated from Russian (Izv. Vyssh. Uchebn. Zaved., Chern. Metall. 1986 (9) p. 153-154)SIGLEAvailable from British Library Document Supply Centre- DSC:5828.4(M--37153)T / BLDSC - British Library Document Supply CentreGBUnited Kingdo