Low-temperature synthesis of NaTaN₂ crystal by ammonothermal method

Abstract

We have succeeded to synthesize a double nitride, NaTaN2 via reaction of a metal Ta and NaNH2 in supercritical ammonia fluid. In Ammonothermal condition, NaTaN2 fine crystal was formed at ≥ 773 K and this reaction was comparatively low temperature process. The products were investigated by using X-ray diffraction, transmission electron microscopy, energy dispersive spectroscopy and UV-Vis diffuse reflectance spectra.