High-pressure synthesis and crystal structure of a novel intermetallic compound Mn(Al,Ge)(5)

摘要

A novel intermetallic compound of the Mn-Al-Ge system, Mn(Al,Ge)(5), was synthesized under high pressure and high temperature (5 GPa and 600 degrees C). The crystal structure was tetragonal with a space group of I4/mcm (no. 140), which was isostructural with PdGa5 or FeAl3Si2. The crystallographic parameters were refined by Rietveld analysis from powder X-ray diffraction data, yielding a = 0.624026 (5) nm, c = 0.981858 (10) nm, and Z = 4. The structure could be considered a defect-Cr5B3 (D8(l)) structure. The hysteresis loop and magnetization-temperature curve revealed the synthesized Mn(Al,Ge)(5) to be paramagnetic: the long Mn-Mn distance led to a structure without magnetic ordering. (C) 2019 Elsevier B.V. All rights reserved.