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Preparation and Crystal Structures of some Binary Pnictides of Scandium, Zirconium, and Hafnium: Sc 5 Bi 3 , ZrBi, α‐HfSb, HfBi, HfBi 2 , and the Compound Zr 5 Bi 3 X 1– x , Possibly Stabilized by an Impurity ( X )
Author(s) -
Haase Martin G.,
Block Helga,
Jeitschko Wolfgang
Publication year - 2001
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/1521-3749(200108)627:8<1941::aid-zaac1941>3.0.co;2-w
Subject(s) - crystal structure , scandium , orthorhombic crystal system , zirconium , materials science , crystallography , impurity , intermetallic , hexagonal crystal system , hafnium , chemistry , metallurgy , organic chemistry , alloy
The title compounds were prepared by reaction of the elemental components. Of these Sc 5 Bi 3 is a new compound. Its orthorhombic β‐Yb 5 Sb 3 type crystal structure was determined from single‐crystal X‐ray data: Pnma , a = 1124.4(1) pm, b = 888.6(1) pm, c = 777.2(1) pm, R = 0.024 for 1140 structure factors and 44 variable parameters. For the other compounds we have established the crystal structures. ZrBi has ZrSb type structure with a noticeable homogeneity range. This structure type was also found for the low temperature (α) form of HfSb and for HfBi. For α‐HfSb this structure was refined from single‐crystal X‐ray data: Cmcm , a = 377.07(4) pm, b = 1034.7(1) pm, c = 1388.7(1) pm, R = 0.043 for 432 F values and 22 variables. HfBi 2 has TiAs 2 type structure: Pnnm , a = 1014.2(2) pm, b = 1563.9(3) pm, c = 396.7(1) pm. The structure was refined from single‐crystal data to a residual of R = 0.074 for 1038 F values and 40 variables. In addition, a zirconium bismuthide, possibly stabilized by light impurity elements X and crystallizing with the hexagonal Mo 5 Si 3 C 1– x type structure, was observed: Zr 5 Bi 3 X 1– x , a = 873.51(6) pm, c = 599.08(5) pm. The positions of the heavy atoms of this structure were refined from X‐ray powder film data. Various aspects of impurity stabilization of intermetallics are discussed.