Neutron powder diffraction investigation of pure and deuterated palladium phosphide Pd6P

Abstract

A structure proposal for Pd6P has been refined by the Rietveld method from neutron powder diffraction 0567-7408/81 / 111965-08501.00profile data to a weighted profile Rwp value of 0.055, based on 1000 measured points in the profile. The space group is P2~/c with a = 5.6740(4), b = 9.4409 (6), c = 8.2100 (6)/i,, ]1 = 110-414 (4) °, U=

Ternary Early-Transition-Metal Palladium Pnictides Zr3Pd4P3, Hf3Pd4P3, HfPdSb, and Nb5Pd4P4

“…Among ternary pnictides M x M ‘ y Pn z (where M = Zr, Hf, Nb, Ta; M ‘ = Ni, Pd, Pt; Pn = P, As, Sb), there are numerous examples containing Ni, but only recently have a few containing Pd (Zr 5 Pd 9 P 7 , Hf 5 Pd 9 P 7 , ZrPdAs, and ZrPdSb) 6 been reported and to date none is known with Pt. Paralleling these contrasts, the binary Ni and Pd phosphides share little in common; the only isostructural members are the phosphorus-rich compounds NiP 3 and PdP 3 . , Besides these, Ni forms other phosphorus-rich compounds such as NiP 2 as well as metal-rich compounds (NiP, Ni 2 P (Fe 2 P- and Ni 2 P-types), , Ni 3 P, Ni 5 P 2 , Ni 5 P 4 , Ni 8 P 3 , and Ni 12 P 5 ), whereas Pd forms only other metal-rich compounds (Pd 3 P (Fe 3 C-type), Pd 6 P, Pd 9 P 2 , Pd 15 P 2 , Pd 7 P 3 ). More striking is the frequent lack of isotypy between the structures of ternary pnictides of Zr and Hf, ostensibly the two most similar elements in the periodic table.…”