Synthesis, Crystal Structures and Properties of the Zintl Phases Sr2ZnP2, Sr2ZnAs2, A2ZnSb2 and A2ZnBi2 (A = Sr and Eu)
- University of Delaware
- ORNL
The new intermetallic compounds Sr2ZnP2, Sr2 ZnAs2, A2ZnSb2 and A2ZnBi2 (A = Sr, Eu) have been synthesized from the corresponding elements through high-temperature reactions using the flux-growth method. Their structures have been established by singlecrystal and powder X-ray diffraction. In all cases, the X-ray diffraction patterns can be successfully indexed based on hexagonal cells in the space group P63/mmc (no. 194) with lattice parameters in the range a = 4.31 4.73 and c = 7.9 8.55 . The average structure can be described in the ZrBeSi type (Pearson symbol hP6; 3 unique positions) with defects on the zinc site structure refinements indicate that every second zinc position is vacant, i.e., their formula unit is AZn1 xPn with x = 0.5 (A = Sr, Eu; Pn = P, As, Sb, Bi). No stoichiometry breadth was observed, which could imply that a super-structure with a long-range order of the zinc vacancies is plausible and evidence for such was sought using electron diffraction. The results from these experiments, as well as magnetic susceptibility measurements and band structure calculations using the LMTO code are also discussed.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 1038091
- Journal Information:
- Zeitschrift fur anorganische und allgemeine Chemie, Vol. 637, Issue 13; ISSN 0044-2313
- Country of Publication:
- United States
- Language:
- English
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