ヘキサフルオロチタン(IV)酸塩からの窒化チタンウイスカーの合成

概要

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Titanium nitride (TiN) whiskers were formed on the outer surface of the graphite tube by heating sodium fluorotitanate (IV) (Na_2TiF_6) at 1300℃ or higher in a stream of nitrogen gas. The shape of whiskers was observed by SEM. The cross section of mostly whiskers was square. It was assumed that these whiskers grew in the <100> direction by Vapor-Solid (VS) mechanism. The lattice constant of TiN obtained in this work was determined by XRD as 0.4243-0.4246 nm, which was larger than 0.4242 nm for that of stoichiometric TiN. This fact showed that TiN obtained in this study contained a trace of carbon. A thermodynamic interpretation of the formation of TiN is considered. It is found that the existence of C, NaF and Al_2O_3 in a stream of N_2 gas is necessary for the formation of TiN from Na_2TiF_6.
1997-01-01