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<p>Metastable materials can exhibit functionalities that outperform the ground&#xa0;state if stabilization routes can be identified. The metastable <i>R</i>32 phase of barium nickelate (BNO) has been proposed to have increased catalytic activity, but the&#xa0;structure-stoichiometry-property relationship has not been established. This study develops routes to stabilize the <i>R</i>32 phase of BNO by determining the impact of pulsed laser deposition (PLD) processing parameters on the stoichiometric tunability and stability of <i>R</i>32 BNO. (100)-oriented <i>R</i>32 BNO thin films were stabilized on (0001) Al<sub>2</sub>O<sub>3</sub> substrates at a substrate temperature of 400&#xa0;°C and oxygen partial pressures ranging from 9.1 × 10<sup>–2</sup>&#xa0;mbar to 1.27 × 10<sup>–2</sup>&#xa0;mbar. This work elucidates the stoichiometric tunability and conductivity of <i>R</i>32 BNO, providing the critical insight needed to advance the application of BNO in catalysis, gas sensing, and lead-free piezoelectrics.</p> Graphical abstract <p></p>

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Epitaxial stabilization and tunable oxygen stoichiometry of R32 BaNiO3-x thin films via pulsed laser deposition

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月19日

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  • Ian C. Graham,
  • Kayla Chuong,
  • Marshall B. Frye,
  • Anna M. Österholm,
  • Lauren M. Garten

摘要

Metastable materials can exhibit functionalities that outperform the ground state if stabilization routes can be identified. The metastable R32 phase of barium nickelate (BNO) has been proposed to have increased catalytic activity, but the structure-stoichiometry-property relationship has not been established. This study develops routes to stabilize the R32 phase of BNO by determining the impact of pulsed laser deposition (PLD) processing parameters on the stoichiometric tunability and stability of R32 BNO. (100)-oriented R32 BNO thin films were stabilized on (0001) Al2O3 substrates at a substrate temperature of 400 °C and oxygen partial pressures ranging from 9.1 × 10–2 mbar to 1.27 × 10–2 mbar. This work elucidates the stoichiometric tunability and conductivity of R32 BNO, providing the critical insight needed to advance the application of BNO in catalysis, gas sensing, and lead-free piezoelectrics.

Graphical abstract