Abstract
A discontinuity in the temperature dependence of the lattice parameters while preserving the crystal symmetry was observed for TbPdAl, TbNiAl and TbPd 0.9 Ni 0.1 Al . We associate this result with the previously reported step-like change in the concentration dependence of lattice parameters in RE ( Ni 1 - x Cu x ) Al pseudo-ternary compounds. Our results corroborate the scenario for the RTX compounds with the ZrNiAl-type structure based on existence of a narrow interval of forbidden c / a values. For TbPdAl, TbNiAl and TbPd 0.9 Ni 0.1 Al we observed also a certain temperature interval of coexistence of two ZrNiAl-type phases characterized by two distinctly different c / a values.
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