Paper Title:
Thermal Expansion and Excess Properties of Åkermanite-Gehlenite Synthetic Solid Solution Series
  Abstract

Thermal expansion of some members of the synthetic solid solution åkermanite-gehlenite was measured (in the range 25-1200°C) for the very first time, with the aim of clarifying the behaviour of this solid solution both with respect to composition and temperature. The results confirmed the non-ideal behaviour at room temperature (negative excess molar volume), and showed a different non-ideal response at high temperature. In fact, excess molar volume is different during the heating and cooling stages: for Xak<0.5 it becomes, from almost ideal, strongly positive at high temperature, while for Xak>0.5 it is always negative. It can then be inferred that (i) lattice dimensions are very sensitive to cation diffusion activated by temperature, (ii) intra-crystalline partition mechanisms, and their effects on the structural features, vary as a function of composition in the solid solution studied.

  Info
Periodical
Materials Science Forum (Volumes 443-444)
Edited by
Yvonne Andersson, Eric J. Mittemeijer and Udo Welzel
Pages
401-406
DOI
10.4028/www.scientific.net/MSF.443-444.401
Citation
M. Proverbio, M. Dapiaggi , G. Artioli, "Thermal Expansion and Excess Properties of Åkermanite-Gehlenite Synthetic Solid Solution Series", Materials Science Forum, Vols. 443-444, pp. 401-406, 2004
Online since
January 2004
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Price
$32.00
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