Structural variations of ScRh3Bx (x=0–1) phase studied by transmission electron microscopy

A Hydride Route to Ternary Alkali Metal Borides: A Case Study of Lithium Nickel Borides

“…However, ABF images suggest that the Li position (marked with green spheres to guide the eye in Figure ) is slightly displaced from the center of the channel, consistent with lowering of the symmetry to P 3 2 12, since the Li 3 a (0,0,0) site in space group P 6 2 22 becomes 3 b ( x , − x , 1/6), allowing for displacement in the ab plane. The ordering of B vacancies accompanied by displacement of Rh atoms in CeRh 3 B x and ScRh 3 B x (CuAu 3 ‐type), as studied by ED and STEM led to superstructures with occupational modulation. This appears not to be the case for LiNi 3 B 1.8 , for which ordering of B atoms does not lead to a superstructure detectable by either electron diffraction or synchrotron powder X‐ray diffraction analyses.…”

Transition‐Metal‐Rich Borides – Fascinating Crystal Structures and Magnetic Properties

“…Ti 2 Rh 6 B (reported above) is the first phase in which a boron ordering was observed due to the presence of the ${1 \over 2}$ ${1 \over 2}$ ${1 \over 2}$ ‐type superstructure reflections in both X‐ray single crystal and powder diffraction data. However, electron diffraction patterns have also revealed the presence of the same type of superstructure reflections together with some satellite ones in CeRh 3 B x (0.4 ≤ x ≤ 0.5)77 and ScRh 3 B x (0.5 ≤ x ≤ 0.75)78 phases. These findings indicate that the structures of these nonstoichiometric perovskite borides are actually only the average structures.…”

Zr2Ir6B with an eightfold superstructure of the cubic perovskite-like boride ZrIr3B0.5: Synthesis, crystal structure and bonding analysis

“…225) [12] is the first phase where a boron ordering was observed due to the presence of the 1/2 1/2 1/2-type superstructure reflections in both X-ray single crystal and powder diffraction data. However, electron diffraction patterns have also revealed the presence of the same type of superstructure reflections together with some satellite ones in CeRh 3 B x (0.4rx r0.5) [13] and ScRh 3 B x (0.5rx r0.75) [14] phases. These findings indicate that the structures of these non-stoichiometric perovskite borides are actually only the average structures.…”