| http://www.w3.org/ns/prov#value | - preferably, F), and n is an integer selected to match the valence of the metal M (e.g., n=5 when M=Ta); providing a vapor that includes one or more disilazanes of the formula (R)xH3-xSiNHSi(R)xH3-x, wherein each R is independently an organic group, and x is 1 to 3; and directing the vapors that include the one or more refractory metal precursor compounds and the one or more disilazanes to the sub
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