The two compositions decagonal quasicrystalline alloys (AlCuCo and AlNiCo) have its formation of a solid solution that derives from a common phase between both systems in that copper the compensation for the nickel.
Several phases in the AlCuCo system are isostructural to those in AlCuFe, when replacing Fe for Co, in this investigation, the structural relationship between the decagonal phase and the crystalline phases in the AlCuCo system is explored, there is one special class of crystals that are vacancy ordered phases which can be described as superstructures of cubic CsCl-phases [8].
Thus, the concentration is shifted out of the stability range of the quasicrystalline phase and a phase transformation can occur for icosahedral phase and decagonal. After 30 min of oxidation the i-phase shows deep ditches etched at the grain boundaries and a buckled grain surface.
The structure of both, [R] and [c], is similar in decagonal quasicrystals and in hexagonal lattices.
Like in hexagonal lattices, in the decagonal quasicrystals, we can have pure longitudinal and transversal waves propagating in all the three directions, x, y, and z.
Due to the isotropy condition in the decagonal plane, the coupling constants of the phonons propagating in this plane are independent of the direction of propagation if they have similar polarization.
A 10 x 10 decagonal isometries matrix (DIM) is thus constructed with the value [a.sub.i,j] being the number of times that "i"-edge appears at the bottom of the decagon with "j"-edge at its right while applying transformations to the decagon considering a given sequence.
The amino acid adjacency matrix and decagonal isometries matrix are used independently to encode the transmembrane and nontransmembrane protein segments.
(1992) The orthor hombic approximant phases of the decagonal phase.
(1995) Structural study of crystalline approximants of the Al--Cu--Fe--Cr decagonal quasicrystal.
Bendersky, who identified the first
decagonal quasicrystals, and D.
* The nucleation and growth properties of icosahedral and
decagonal phases were examined.