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A. Kupsch, Dirk C. Meyer, P. Gille, Peter Paufler

Thermal expansion of decagonal Al_70.7Co_13.3Ni_16.0 in the temperature range 15–300 K

The temperature dependence of lattice parame-ters a in the quasiperiodic plane and c in the periodic direc-tion of decagonal Al_70.7Co_13.3Ni_16.0 was probed using X-ray powder diffraction in the temperature range 15–300 K. Both parameters were fitted by means of positions of 22 Bragg reflections for each temperature. Temperature de-pendences were modelled best by second order polynomials leading to linear thermal coefficients α(T) = 8.1(33) · 10^–7K^–1 + 3.9(2)· 10^–8K^–2T in the quasiperiodic plane and γ(T) = 1.7(6) · 10^–6K^–1 + 3.8(3) · 10^–8K^–2T in the periodic direction, respectively. Thus we found the anisotropy ratio γ(T)/α(T) to rise with increasing temperature from 1.10 (at 15 K) to 1.19 (at 300 K). Besides pecularities around 150 K indicating an intermediate phase formed by superordering, we observed deviations from the general smooth course be-tween 15K and 50K for both lattice parameters.

Zeitschrift für Kristallographie, Oldenbourg Wissenschaftsverlag

Print ISSN: 0044-2968
Volume: 216, 12/2001
Pages: 607

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