Synthesis and characterization of nitrides of iridium and palladium


We describe the synthesis of nitrides of iridium and palladium using the laser-heated diamond anvil cell. We have used the in situ techniques of x-ray powder diffraction and Raman scattering to characterize these compounds and have compared our experimental findings where possible to the results of first-principles theoretical calculations. We suggest that palladium nitride is isostructural with pyrite, while iridium nitride has a monoclinic symmetry and is isostructural with baddeleyite.

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J. Crowhurst gratefully acknowledges discussions with R. Yu, E. Gregoryanz, P. Kroll, and M. Somayazulu. J. Crowhurst and J. Zaug also thank S. Caldwell for assistance with XRD measurements. Use of the HPCAT facility was supported by DOE-BES, DOE-NNSA (CDAC), NSF, DOD—TACOM, and the W.M. Keck Foundation. Use of the Advanced Photon Source was supported by the United States Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. W-31-109-Eng-38. GeoSoilEnviroCARS is supported by the National Science Foundation—Earth Sciences (EAR-0622171), Department of Energy—Geosciences (DE-FG02-94ER14466) and the State of Illinois. The Advanced Light Source is supported by the Director, Office of Science, Office of Basic Energy Sciences, Materials Sciences Division, of the United States Department of Energy under Contract No. DE-AC03-76SF00098 at Lawrence Berkeley National Laboratory and the University of California, Berkeley, California. Work at LLNL was performed under the auspices of the United States Department of Energy by the University of California, Lawrence Livermore National Laboratory under Contract No. W-7405-Eng-48 and was supported by the LDRD office of Lawrence Livermore National Laboratory (LLNL).

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Correspondence to Jonathan C. Crowhurst.

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Crowhurst, J.C., Goncharov, A.F., Sadigh, B. et al. Synthesis and characterization of nitrides of iridium and palladium. Journal of Materials Research 23, 1–5 (2008).

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