Anomalous behavior of hardness and crystal structure in CeRh3Bx (x=0–1) phase

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.…”

Direct Chemical Fine‐Tuning of Electronic Properties in Sc2Ir6−xPdxB

“…As a consequence, ordering at these sites would not only lead to different chemical compositions, but also to unexpected physical properties. In fact, it has been shown, using selected‐area electron diffraction (SAED), that a sharp drop of microhardness values near x= 0.5 in ScRh 3 B x and CeRh 3 B x series is directly related to the presence of superstructure and satellite reflections . Recently, many compounds showing boron ordering in their X‐ray diffraction patterns were investigated, the results of which lead to ternary double perovskite borides (space group Fm m no.…”

“…In fact, it has been shown, using selected-area electron diffraction (SAED), that as harp drop of microhardness values near x = 0.5 in ScRh 3 B x and CeRh 3 B x series is directly related to the presence of superstructure and satellite reflections. [8,9] Recently,m any compounds showingb oron ordering in their X-ray diffraction patterns were investigated, the resultsofw hich lead to ternary doubleperovskite borides( space group Fm3 m; no. 225, vacant double perovskite structure): Ti 2 Rh 6 B, [10,11] Zr 2 Ir 6 B, [12] Sc 2 Ir 6 B [13] and Eu 2 Pd 6 B.…”