Two-Step Solid-State Synthesis of Ternary Nitride Materials

Paul Todd, M. Fallon, James Neilson, Andriy Zakutayev

Research output: Contribution to journalArticlepeer-review

7 Scopus Citations

Abstract

Ternary nitride materials hold promise for many optical, electronic, and refractory applications; yet, their preparation via solid-state synthesis remains challenging. Often, high pressures or reactive gases are used to manipulate the effective chemical potential of nitrogen, yet these strategies require specialized equipment. Here, we report on a simple two-step synthesis using ion-exchange reactions that yield rocksalt-derived MgZrN2 and Mg2NbN3, as well as layered MgMoN2. All three compounds show almost temperature-independent and weak paramagnetic responses to an applied magnetic field at cryogenic temperatures, indicating phase-pure products. The key to synthesizing these ternary materials is an initial low-temperature step (300-450 °C) to promote Mg-M-N nucleation. The intermediates then are annealed (800-900 °C) to grow crystalline domains of the ternary product. Calorimetry experiments reveal that initial reaction temperatures are determined by phase transitions of reaction precursors, whereas heating directly to high temperatures results in decomposition. These two-step reactions provide a rational guide to material discovery of other bulk ternary nitrides.

Original languageAmerican English
Pages (from-to)1677-1683
Number of pages7
JournalACS Materials Letters
Volume3
Issue number12
DOIs
StatePublished - 6 Dec 2021

Bibliographical note

Publisher Copyright:
©

NREL Publication Number

  • NREL/JA-5K00-80587

Keywords

  • metathesis
  • nitrides
  • solid-state synthesis
  • ternary nitrides

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