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Isostructural Transition in RTAl Compounds at High Temperatures

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Prchal J., Javorský P., de Boer F., Moleman A.

Acta Physica Polonica A

2008

vol. 113

issue 1

335-338

Based on previously discovered forbidden values of the c/a ratio, we studied anomalies in the temperature evolution of the lattice parameters (a, c) of several hexagonal RTAl compounds at high temperatures (above room temperature). The compound ErNi_{0.45}Cu_{0.55}Al, that seemed to be impossible to be prepared in single-phase form, reaches the single-phase state at temperatures above 493 K (220°C). On the other hand, the compound TbNi_{0.7}Cu_{0.3}Al - that was expected to undergo a first-order structural phase transition at high temperatures - exhibits a second-order type transition when approaching the critical values of the c/a ratio. These results are in agreement with idea of a forbidden range of c/a values in these compounds.

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1 Acta Physica Polonica A

1 2008

1 Javorský P.

1 Moleman A.

1 Prchal J.

1 de Boer F.

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Isostructural Transition in RTAl Compounds at High Temperatures