Superconducting nitride halides MNX (M = Ti, Zr, Hf; X = Cl, Br, I)

Christian M. Schurz 1 , Larysa Shlyk 2 , Thomas Schleid 3 ,  and Rainer Niewa
  • 1  Universität Stuttgart, Institut für Anorganische Chemie, Stuttgart, Deutschland
  • 2  Universität Stuttgart, Institut für Anorganische Chemie, Stuttgart, Deutschland
  • 3  Universität Stuttgart, Institut für Anorganische Chemie, Stuttgart, Deutschland

Abstract

Two different polymorphs of the metal nitride halides MNX (M = Ti, Zr, Hf; X = Cl, Br, I) are known to crystallize in layered structures. The two crystal structures differ in the way 2{X[M2N2]X} slabs are stacked along the c-axes. Metal atoms and/or organic molecules can be intercalated into the van-der-Waals gap between these layers. After such an electron-doping via intercalation the protoätypic band insulators change into superconductors with moderate high critical temperatures Tc up to 25.5 K. This review gathers information on synthesis routes, structural characteristics and properties of the prototypic nitride halides and the derivatives after electron-doping with a focus on superconductivity.

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Zeitschrift für Kristallographie – Crystalline Materials offers a place for researchers to present results of their crystallographic studies. The journal includes theoretical as well as experimental research. It publishes Original Papers, Letters and Review Articles in manifold areas of crystallography.

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