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Related Experiment Video

Updated: Oct 3, 2025

Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates
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Reversible Hydrogen-Induced Phase Transformations in La0.7Sr0.3MnO3 Thin Films Characterized by In Situ Neutron

Alessandro R Mazza1, Qiyang Lu1, Guoxiang Hu2

  • 1Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.

ACS Applied Materials & Interfaces
|February 16, 2022
PubMed
Summary

Hydrogenation drives phase transitions in perovskite oxides by creating oxygen vacancies, altering electronic properties. These changes persist even without hydrogen in the lattice, revealing a new mechanism for material transformation.

Keywords:
LSMOcorrelated oxideshydrogenationneutron reflectometryoxygen vacancyphase transformationsreduction reaction

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Condensed Matter Physics

Background:

  • Perovskite oxides are crucial functional materials with tunable properties.
  • Hydrogenation is known to induce structural and electronic changes in oxides.
  • Understanding the precise mechanism of hydrogen-induced transitions is key for materials design.

Purpose of the Study:

  • To elucidate the mechanism of hydrogen-induced topotactic phase transitions in perovskite oxides.
  • To investigate the role of oxygen vacancies and electron-phonon coupling.
  • To determine the state of hydrogen within the lattice during the transition.

Main Methods:

  • Utilized X-ray diffraction (XRD) for lattice structure analysis.
  • Employed in situ XRD and neutron reflectometry (NR) to track phase transformations.
  • Performed theoretical calculations to confirm energetic favorability of oxygen vacancy formation.

Main Results:

  • Hydrogenation induced lattice expansion and a metal-insulator transition in La$_{0.7}$Sr$_{0.3}$MnO$_{3}$.
  • Oxygen vacancy ordering led to a phase transition from perovskite to brownmillerite (La$_{0.7}$Sr$_{0.3}$MnO$_{2.5}$).
  • Neutron reflectometry indicated no steady-state presence of deuterium (hydrogen) in the lattice.

Conclusions:

  • Hydrogenation drives phase transitions via oxygen vacancy formation and ordering, not direct hydrogen intercalation.
  • The observed electronic and structural changes are mediated by strain and oxygen vacancies.
  • Reversible oxygen-deficient states were achieved, highlighting potential for tunable material properties.