Abstract
A symmetry analysis of the monoclinic (space group C2/c) Pd6B superstructure formed in the cubic (with structure B1) boron solid solution PdB y in palladium has been performed. The formation of this superstructure occurs as a first-order phase transition via the disorder-order transition channel including nine nonequivalent superstructure vectors of four stars {k 10}, {k 4}, {k 3}, and {k 0}. For the monoclinic (space group C2) Pd6B superstructure, the distribution function of boron atoms has been calculated and the interval of admissible values of long-range order parameters has been determined. It has been shown that the found transition channel is identical to the channel of the formation of the monoclinic (space group C2/c) M 6 X superstructure; therefore, the Pd6B superstructure can be described with the same accuracy in space group C2. The higher symmetry of the monoclinic (space group C2/c) model suggests that it more accurately describes the structure of the phase Pd6B (Pd6B□5) and mutually inverse phases M 6 X□5 and M 6 X 5□ than the model with space group C2. It has been demonstrated that there are two types of the nearest environment of metal atoms with non-metal sublattice sites arranged in the first and second coordination spheres in M 6 X□5-type superstructures (space groups C2/c, C2, C2/m, and P31) and in inverse M 6 X 5□-type superstructures with the same space groups.
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Original Russian Text © A.I. Gusev, 2011, published in Fizika Tverdogo Tela, 2011, Vol. 53, No. 8, pp. 1582–1588.
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Gusev, A.I. Symmetry analysis of the monoclinic Pd6B superstructure: Long- and short-range orders. Phys. Solid State 53, 1664–1671 (2011). https://doi.org/10.1134/S1063783411080130
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DOI: https://doi.org/10.1134/S1063783411080130