Comparison of topotactic and magnetic structures for manganite oxide films

Yukuai Liu, Sixia Hu, Boyang Zhao, Xinrong Shi, Xiezong Zeng, Chi Wah Leung, Chuanwei Huang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

Deliberate manipulation of topotactic transformation via oxygen insertion/extraction offers a feasible way to precisely tune oxygen concentration, B–O coordination occupation and resultant electronic functionalities of perovskite (ABO3)-based oxides. Herein, two methods, a post-annealing CaH2 treatment and an in-situ oxygen-vacancy diffusion using oxygen getter layer, were conducted to achieve topotactic transitions from perovskite to brownmillerite of La0·7Sr0·3MnO3-δ (LSMO, 0 ≤ δ ≤ 0.5) films. The results revealed that delicate control of oxygen composition is the crucial factor for evolutions of crystalline structure and subsequent magnetic properties of LSMO films. In particular, the brownmillerite LSMO film treated by the in-situ oxygen getter layer possesses desirable structural stability over time. In contrast, the topotactic LSMO films using reduction agents CaH2 exhibit compositional and structural inhomogeneities. These findings suggest that adjustable topotactic transformation through anionic oxygen provides a facile strategy for designing multifunctional perovskite-derivative oxide materials.

Original languageEnglish
Pages (from-to)12515-12519
Number of pages5
JournalCeramics International
Volume48
Issue number9
DOIs
Publication statusPublished - 1 May 2022

Keywords

  • Brownmillerite
  • Magnetic insulator
  • Manganite oxide film
  • Pulsed laser deposition

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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