Investigation of transition from decagonal to vacancy ordered phase on replacement of Co by Cu in Al70Co15–xCuxNi15
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T. P. Yadav
Abstract
The alloy with composition Al70Co15Ni15 forms one of the important quasicrystalline phase exhibiting formation of decagonal variants [1, 2]. In the present investigation, copper has been substituted in place of cobalt i.e. the phases corresponding to Al70Co15–xCuxNi15, have been investigated. It is found that when copper concentration reaches to a value of 10 atomic percent with the composition corresponding to Al70Co5Cu10Ni15, the decagonal phase starts yielding to give rise to vacancy ordered phase. When all cobalt is replaced by copper i.e. when the composition corresponds to Al70Cu15Ni15, the decagonal phase disappears and the only phase observed is the vacancy ordered phase. It can thus be said that copper substitution brings in decagonal to vacancy ordered (VOP) phase transition. It has also been observed that gradual increase in concentration of Cu in Al70Co15–xCuxNi15 leads to cellular to dendritic transition in morphology.
© 2003 Oldenbourg Wissenschaftsverlag GmbH
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- Books Received
Articles in the same Issue
- On the discovery of new low temperature monoclinic phases with Cm and Cc space groups in Pb(Zr0.52Ti0.48)O3: an overview
- Tricalcium silicate Ca3SiO5, the major component of anhydrous Portland cement: on the conservation of distances and directions and their relationship to the structural elements
- Investigation of transition from decagonal to vacancy ordered phase on replacement of Co by Cu in Al70Co15–xCuxNi15
- White beam synchrotron X-ray topography studies of twinning in GdFeO3-type perovskite crystals
- Synthesis, X-ray crystal structure and dielectric measurements of a tetragonal tungsten bronze: Pb0.75K1.80Li1.70Nb5O15
- Ab initio structure determination of In2H2(P2O7)(P4O12) from X-ray powder diffraction data
- EXAFS and XRD investigations of zeunerite and meta-zeunerite
- Crystal and molecular structures of 4-aryl-1,4-dihydropyrimidines: Novel calcium channel antagonists
- Crystal structure of anhydrous potassium O-n-propyldithiocarbonate. Theoretical calculations of O-alkyl dithiocarbonates
- Synthesis and crystal structure of diaquabis(diketohydrindene-diketohydrindamine)manganese(II)
- Ab initio structure determination of cytochrome c6 by combined reciprocal space-real space approach
- Books Received
