The high-pressure phase of CePtAl

摘要

The intermetallic aluminum compound HP-CePtAl was synthesized by arc melting of the elements with subsequent high-pressure/high-temperature treatment at 1620 K and 10.5 GPa in a multianvil press. The compound crystallizes in the hexagonal MgZn2-type structure (P6(3)/mmc) with lattice parameters of a = 552.7(1) and c = 898.8(2) pm refined from powder X-ray diffraction data. With the help of single crystal investigations (wR = 0.0527, 187 F-2 values, 13 variables), the proposed structure type was confirmed and the mixed Pt/Al site occupations could be refined. Magnetic susceptibility measurements showed a disappearance of the complex magnetic ordering phenomena, which are observed in NP-CePtAl.