Abstract
A highly oriented thin-layered zirconium nitride, ZrN, was derived from layer-structured crystals β-ZrNCl via deintercalation of the chlorine atoms by the reaction with Na metal vapor. β-ZrNCl consists of rhombohedrally stacked [Cl−Zr−N−N−Zr−Cl] slabs, each of which is composed of a honeycomblike double ZrN layer sandwiched between two close-packed chlorine layers. On deintercalation of the chlorine layers, the honeycomblike ZrN layers converted into ZrN(001) layers of the rock salt structure by expanding to the three equivalent directions 〈100〉 of β-ZrNCl. β-ZrNCl crystals were also thermally decomposed into ZrN at 950 °C under a stream of N2/H2 mixed gas. The two types of ZrNs that were obtained had the same stoichiometric composition of 1:1 but showed superconductivity at different transition temperatures (Tcs) of 6.2 and 10.0 K for the thin-layered and the thermally decomposed structures, respectively.
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