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Formation of Metallic and Carbide Phases via Codecomposition of [NiEn3]WO4 and Lithium Hydride in the Range 410–1060°C

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Abstract—

The formation of metallic and carbide phases during the thermal decomposition of a mixture of the coordination compound [NiEn3]WO4 (En = ethylenediamine) and LiH in a He atmosphere has been studied by X-ray diffraction. The results demonstrate that heat treatment of the mixture at 410°C for 10 min leads to the formation of a Ni(Cx) interstitial solid solution based on the HCP Ni lattice and a W1 –xNix substitutional solid solution based on the BCC W lattice. Starting at 510°C, a Ni1 –xWx solid solution based on the FCC Ni lattice is also formed. The double carbide Ni2W4Cx appears at 660°C, and Ni6W6Cx forms at 860°C. Under similar conditions (700°C, He), the thermal decomposition of a mixture of NiWO4 and LiH leads to the formation of W and an FCC Ni1 –xWx (x ~ 0.12) solid solution.

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ACKNOWLEDGMENTS

We are grateful to S.P. Khranenko, Candidate of Chemistry, for providing the [NiEn3]WO4 samples.

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Authors and Affiliations

  1. Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, pr. Akademika Lavrent’eva 3, 630090, Novosibirsk, Russia

    S. A. Gromilov & R. E. Nikolaev

  2. Novosibirsk State University, ul. Pirogova 2, Novosibirsk, , 630090 , Russia

    S. A. Gromilov & E. Yu. Gerasimov

  3. Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, pr. Akademika Lavrent’eva 5, 630090, Novosibirsk, Russia

    E. Yu. Gerasimov

Authors
  1. S. A. Gromilov
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  2. E. Yu. Gerasimov
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  3. R. E. Nikolaev
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Correspondence to S. A. Gromilov.

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Translated by O. Tsarev

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Gromilov, S.A., Gerasimov, E.Y. & Nikolaev, R.E. Formation of Metallic and Carbide Phases via Codecomposition of [NiEn3]WO4 and Lithium Hydride in the Range 410–1060°C. Inorg Mater 55, 331–336 (2019). https://doi.org/10.1134/S0020168519040071

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