Issue 89, 2016

Aluminal speciation in the crystal nucleus: a mass spectral interpretation

Abstract

Mass spectral line positions m/z are computed from a general formula for aluminium cations, AlnOp(OH)q(OH2)r(3n−2pq)+, without treating n, p, q and r as independent variables but instead constraining parameters by tetrahedral or octahedral symmetry, in accordance with each of a number of structural possibilities. In one instance, a ring is distinguishable from a chain; in another, an orthorhombic sheet from a hexagonal prism. Amongst other polyhedra, five distinct icosahedral cases are discussed. Classical constructions are revisited in the light of aperiodic tiling. Successive Fibonacci numbers may describe the nucleation of a structure previously regarded as amorphous. Recent experimental observations are reviewed in the same context, and re-interpreted. A spectral value may be ascribed to a tetrahedral or an octahedral species (ambiguity is rare). The results may be a significant factor in an understanding of crystal nucleation.

Graphical abstract: Aluminal speciation in the crystal nucleus: a mass spectral interpretation

Associated articles

Supplementary files

Article information

Article type
Paper
Submitted
30 Apr 2016
Accepted
22 Aug 2016
First published
24 Aug 2016

RSC Adv., 2016,6, 86540-86559

Aluminal speciation in the crystal nucleus: a mass spectral interpretation

A. S. Hare, RSC Adv., 2016, 6, 86540 DOI: 10.1039/C6RA11209A

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