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The Praseodymium Zinc Arsenide Pr₃Zn₂As₆: Crystallizing with a Vacancy Variant of the HfCuSi₂ Type Structure

Author： Nientiedt A.T. Jeitschko W.

Publisher： Academic Press

ISSN： 0022-4596

Source： Journal of Solid State Chemistry, Vol.142, Iss.2, 1999-02, pp. : 266-272

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

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Abstract

The new compound Pr₃Zn₂As₆ has been prepared by reaction of the elemental components in a NaCl–KCl flux. It crystallizes with a very pronounced subcell of the HfCuSi₂ type structure with two formula units PrZn_2/3As₂ in the tetragonal subcell with a=400.6(1) pm and c=1019.7(4) pm. The ordered distribution of occupied and unoccupied zinc positions leads to a three times larger cell. This structure was determined from four-circle X-ray diffractometer data of a twinned crystal: Pmmn, a=399.89(9) pm, b=1204.2(3) pm, c=1019.7(4) pm, Z=2, R=0.039 for 2663 structure factors and 39 variable parameters. Chemical bonding in this compound is briefly discussed.

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