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Cation solubility of bulk LaW(O,N)₃ synthesized from ternary oxide precursors via ammonolysis
Berger, Shannon Rose
Berger, Shannon Rose
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2024
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Many nitride perovskites have been computationally determined to be stable, yet few of these materials have been synthesized in bulk form. The nitride material discovery community has devoted significant efforts to developing ternary nitride ceramic thin films. The piezoelectric nitride perovskite, LaWN3 shows promising electrical properties as the first ferroelectric nitride, but it has only been synthesized in thin film form. Here, we synthesize LaWN3 and oxynitride LaW(O,N)3 powders from oxide precursor La2W2O9 by ammonolysis. We investigate the nitridation of ternary oxides with varying La:W ratio to determine phase solubility present in these stoichiometric and off-stoichiometric nitrides, oxynitrides, and precursors. Here we show that the solid solubility of cations in the perovskite structure of the oxynitride is significantly higher than its precursor counterpart, and the perovskite can be synthesized from multi-phase oxide precursors as well. These results establish a foundation for studying the effects of vacancies and other defects responsible for a non-symmetric phase solubility between the cations. This work is a step towards understanding the synthesis of bulk nitride perovskites, and the synthetic challenges involved with this complex system.
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