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Title: Unusual Coexistence of Nickel(II) and Nickel(IV) in the Quadruple Perovskite Ba4Ni2Ir2O12 Containing Ir2NiO12 Mixed-Metal-Cation Trimers

Journal Article · · Inorganic Chemistry
 [1];  [2];  [1]; ORCiD logo [1]
  1. Univ. of South Carolina, Columbia, SC (United States). Dept. of Chemistry and Biochemistry
  2. Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division, Advanced Photon Source (APS)

In this paper, the crystal chemistry and magnetic properties of two hexagonal nickel(IV)-containing perovskites, Ba4Ni1.94Ir2.06O12 and BaNiO3, are reported. The 12R perovskite, Ba4Ni1.94Ir2.06O12, possesses an unexpected coexistence of nickel(II) and nickel(IV). This quadruple perovskite structure contains Ir2NiO12 mixed-metal-cation units in which direct metal–metal bonding between nickel(IV) and iridium(V) is inferred. Finally, X-ray absorption near-edge spectroscopy and X-ray photoelectron spectroscopy measurements were conducted to confirm the simultaneous presence of nickel(II) and nickel(IV).

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); Univ. of South Carolina, Columbia, SC (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF)
Grant/Contract Number:
AC02-06CH11357; DMR-1301757; OIA-1655740
OSTI ID:
1433915
Journal Information:
Inorganic Chemistry, Vol. 57, Issue 6; ISSN 0020-1669
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (4)