Details

Autor(en) / Beteiligte

• Provino, Alessia
• Ritter, Clemens
• Smetana, Volodymyr
• Mudring, Anja-Verena
• Pani, Marcella
• Pecharsky, Vitalij K.
• Manfrinetti, Pietro

Titel

Crystal and Magnetic Structures of the Ternary Ho 2 Ni 0.8 Si 1.2 and Ho 2 Ni 0.8 Ge 1.2 Compounds: An Example of Intermetallics Crystallizing with the Zr 2 Ni 1– x P Prototype

Ist Teil von

• Inorganic chemistry, 2021-11, Vol.60 (21), p.16397-16408

Erscheinungsjahr

2021

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We report two new rare-earth (R) ternary intermetallic compounds—Ho 2 Ni 0.8 T 1.2  with T = Si and Ge—that correspond to the R 5 Ni 2 T 3  phase earlier reported to form in Dy–Ni–T and Ho–Ni–T ternary systems. The compounds crystallize in a filled version of the orthorhombic Zr 2 Ni 1– x P-type structure with  x  = 0.52; their stoichiometry, determined from both single-crystal and powder X-ray diffraction data, is centered on Ho 2 Ni 0.8 T 1.2  with a narrow solid solubility range for the silicide, while the germanide appears to be a line phase. In addition to R = Dy and Ho, R 2 Ni 0.8 T 1.2  compounds also form for R = Y and Tb, representing the first examples of rare-earth-based compounds adopting the Zr 2 Ni 1– x P structural prototype. Bulk magnetization data reveal the main transitions of the ferrimagnetic or ferromagnetic type at  T C  = 38 K for Ho 2 Ni 0.8 Si 1.2  and  T C  = 37 K for Ho 2 Ni 0.8 Ge 1.2 , which are followed by subsequent magnetic reordering at lower temperatures. Neutron diffraction shows complex magnetic structures below  T C  with both ferromagnetic and antiferromagnetic components and magnetic propagation vector κ 1  = [0, 0, 0]. Below  T N  ≅ 24 K (22 K) for the silicide (germanide), an additional antiferromagnetic coupling following an incommensurate magnetic propagation vector κ 2  = [κ x , 0, 0] appears to coexist with the first magnetic structure.