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Title: Ambient and High Pressure CuNiSb2: Metal-Ordered and Metal-Disordered NiAs-Type Derivative Pnictides

Journal Article · · Inorganic Chemistry
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4];  [2]; ORCiD logo [2];  [5]; ORCiD logo [6];  [7];  [2]; ORCiD logo [3]; ORCiD logo [8]; ORCiD logo [2]
  1. George Mason Univ., Fairfax, VA (United States)
  2. Rutgers Univ., Piscataway, NJ (United States)
  3. Univ. of California, Davis, CA (United States)
  4. Univ. of Antwerp (Belgium). EMAT
  5. Florida State Univ., Tallahassee, FL (United States)
  6. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  7. Columbia Univ., Palisades, NY (United States). Lamont Doherty Earth Observatory
  8. George Mason Univ., Fairfax, VA (United States); Rutgers Univ., Piscataway, NJ (United States)

The mineral Zlatogorite, CuNiSb2, was synthesized in the laboratory for the first time by annealing elements at ambient pressure (CuNiSb2-AP). Rietveld refinement of synchrotron powder X-ray diffraction data indicates that CuNiSb2-AP crystallizes in the NiAs-derived structure (P3m1, #164) with Cu and Ni ordering. The structure consists of alternate NiSb6 and CuSb6 octahedral layers via face-sharing. The formation of such structure instead of metal disordered NiAs-type structure (P63/mmc, #194) is validated by the lower energy of the ordered phase by first-principle calculations. Interatomic crystal orbital Hamilton population, electron localization function, and charge density analysis reveal strong Ni-Sb, Cu-Sb, and Cu-Ni bonding and long weak Sb-Sb interactions in CuNiSb2-AP. The magnetic measurement indicates that CuNiSb2-AP is Pauli paramagnetic. First-principle calculations and experimental electrical resistivity measurements reveal that CuNiSb2-AP is a metal. The low Seebeck coefficient and large thermal conductivity suggest that CuNiSb2 is not a potential thermoelectric material. Single crystals were grown by chemical vapor transport. The high pressure sample (CuNiSb2-8 GPa) was prepared by pressing CuNiSb2-AP at 700 °C and 8 GPa. However, the structures of single crystal and CuNiSb2-8 GPa are best fit with a disordered metal structure in the P3m1 space group, corroborated by transmission electron microscopy.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); COS-Seed Award
Grant/Contract Number:
AC02-06CH11357; FOA-0001276; DMR-170938; 181283
OSTI ID:
1760277
Journal Information:
Inorganic Chemistry, Vol. 59, Issue 19; ISSN 0020-1669
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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