Formation of Metallic and Carbide Phases via Codecomposition of [NiEn3]WO4 and Lithium Hydride in the Range 410–1060°C
, E-ISSN: 1608-3172
||coordination compound; double carbides; ethylenediamine nickel; high-resolution transmission electron microscopy; thermal decomposition; tungstate anion
Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, pr. Akademika Lavrent’eva 3, Novosibirsk, 630090, Russian Federation
Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russian Federation
Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, pr. Akademika Lavrent’eva 5, Novosibirsk, 630090, Russian Federation
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.