  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.
