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The Unexpected Formation of MB 2 Layers (M = Refractory Metal) on Metal Surfaces
Author(s) -
Friedhoff Wibke,
Milke Edgar,
Binnewies Michael
Publication year - 2011
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201001064
Subject(s) - refractory metals , chemistry , molybdenum , tungsten , metal , coating , mass spectrometry , diffraction , refractory (planetary science) , phase (matter) , atmosphere (unit) , analytical chemistry (journal) , inorganic chemistry , metallurgy , thermodynamics , materials science , organic chemistry , physics , chromatography , optics
The reactions between refractory metals (Ti, Zr, V, Nb, Ta, Mo, W) and BCl 3 vapour at high temperatures have been studied. For this purpose, the metal wires were heated up by an electrical current in a BCl 3 atmosphere for a couple of hours. Optical and X‐ray diffraction methods were used to analyze the solid products, whereas mass spectrometry was used to study the gas phase composition. In the reactions with Ti, Zr, V, Nb and Ta, we observed the formation of MB 2 layers on the metal surfaces. Molybdenum reacted with formation of MoB, with tungsten no reaction was observed at all. This is contrary to the thermodynamic expectations. The mechanism of the coating process is discussed from a thermodynamic viewpoint.