ScPd2Al3 New Polymorphic Phase in Al-Pd-Sc System
Ji\v{r}\'i Posp\'i\v{s}il, Yoshinori Haga, Kunihisa Nakajima, Norito, Ishikawa, Ivana C\'isa\v{r}ov\'a, Naoyuki Tateiwa, Etsuji Yamamoto, Tomoo, Yamamura
TL;DR
This paper reports the discovery of a new polymorphic intermetallic compound, ScPd2Al3, with distinct orthorhombic and cubic phases, and characterizes its phase transition near the icosahedral quasicrystal phase.
Contribution
It introduces a novel compound with unique polymorphic behavior and details its structural phases and transition characteristics.
Findings
Discovered a new compound ScPd2Al3 with unknown structure
Identified reversible phase transition at 1053°C
Found polymorphism with orthorhombic and cubic phases
Abstract
We have discovered a new compound of the composition ScPd2Al3 crystallizing in unknown structure type. Moreover, ScPd2Al3 reveals polymorphism. We have found an orthorhombic crystal structure at room temperature and a high temperature cubic phase. The polymorphic phases are separated by a reversible first order transition at 1053{\deg}C with a hysteresis of 19{\deg}C. ScPd2Al3 exists as a very stable intermetallic phase just in the vicinity of the icosahedral quasicrystal Tsai-type i-phase Al54Pd30Sc16.
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