Nitride tuning of lanthanide chromites
Ashley P. Black, Hannah E. Johnston, Judith Oró-Solé, Bernat Bozzo, Clemens Ritter, Carlos Frontera, J. Paul Attfield and Amparo Fuertes*; Chem. Commun., 2016,52, 4317-4320; DOI: 10.1039/C6CC00744A
LnCrO3−xNx perovskites with Ln = La, Pr and Nd and nitrogen contents up to x = 0.59 have been synthesised through ammonolysis of LnCrO4 precursors. These new materials represent one of the few examples of chromium oxynitrides. Hole-doping through O2−/N3− anion substitution suppresses the magnetic transition far less drastically than Ln3+/M2+ (M = Ca, Sr) cation substitutions because of the greater covalency of metal–nitride bonds. Hence, nitride-doping is a more benign method for doping metal oxides without suppressing electronic transitions.
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