ISM2019 (Microscopy)

CHARACTERIZATION OF STRUCTURES CRYSTALLIZING IN THE CU2-XS SAMPLES GROWN BY CHEMICAL VAPOR DEPOSITION

Gili Yaniv 1 Eti Teblum 2 Gilbert Daniel Nessim 2 Louisa Meshi 1
1The Department of Materials Engineering, Ben-Gurion University of the Negev, Beer-Sheva, Israel
2The Department of Chemistry and Institute of Nanotechnology, Bar-Ilan University, Ramat Gan, Israel

The region of the of the copper sulfide region, Cu2-xS (0.05 < x < 0.26), is known to possess many interesting and complicated phases [1-4]. Digenite is one of the common structure types and is based on a cubic close-packing array, crystallizing in the Fm-3m space group with a=5.57A [5]. Several types of ordered digenite superstructures have been reported: 2a, 3a, 4a, 5a and 6a, which are named as multiples of the dimension of the cubic sub-cell [6].

In Prof. Nessim`s laboratory, novel method was developed for growing layered, crystalline, p-type copper sulfide. It is a one-step synthesis performed by thermal annealing of a standard copper foil in an inert environment using chemical vapor deposition (CVD) [7].

In the current work, characterization of this material was performed using transmission electron microscopy (TEM). Several structural variants of the basic FCC digenite were found: ordered 6a digenite, basic FCC structure and a primitive cubic structure, which was not reported before. The space group of the later structure evaluated and determined as Pa-3. In addition, the 6a ordered digenite phase`s analysis has revealed an interesting radiation damage affect and twin of modulation.

References

  1. Donnay, J. D. H. Donnay, G. Kullerud, Am. Min. 43 (1958) 228.
  2. Putnis, Am. Min. 62 (1977) 107.
  3. N. Gray, Roy Clarke, Phys. Rev. B 33 (1986) 2056.
  4. Posfai, P. R. Buseck, Am. Min. 79 (1994) 308.
  5. Morimoto, G. G. Kullerud, An. Min. 48 (1963) 110.
  6. Conde, C. Manolikas, D. Van Dyck, P. Delavignette, J. Van Landuyt, S. Amelinckx, Mat. Res. Bull. 13 (1978) 1055.
  7. Itzhak, E. Teblum, O. Girshevitz, S. Okashy, Y. Turkulets, L. Burlaka, G. Cohen-Taguri, E. S. Avraham, M. Noked, I. Shalish, G. D. Nessim, Chem. Mater. 30 (2018) 2379.








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