In situ high-temperature powder diffraction study of reversible phase transitions in decagonal Al_71.2Co_12.8Ni₁₆

This experimental work is aimed at confirming and broadening findings of former investigations into the type I↔S1 phase transition in Al–Co–Ni quasicrystals. In situ high-temperature synchrotron radiation measurements were carried out on Al_71.2Co_12.8Ni₁₆ powder samples. The cell parameters were precisely determined at various temperatures in the range 290–1110 K. The data provided a new extended insight into the thermal expansion of Al_71.2Co_12.8Ni₁₆ and into fundamental properties of the phase transition.