prov:value
| - The refractory metal compound may include refractory metals such as for example titanium (Ti), tungsten (W), tantalum (Ta), zirconium (Zr), hafnium (Hf), molybdenum (Mo), niobium (Nb), vanadium (V), and chromium (Cr), among others combined with reactive species such as, for example chlorine (Cl) and fluorine (F).
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