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Title: Competing Pathways for Nucleation of the Double Perovskite Structure in the Epitaxial Synthesis of La2MnNiO6

Journal Article · · Chemistry of Materials
 [1];  [1];  [1];  [1];  [2];  [3];  [1];  [4];  [1];  [1];  [2];  [1];  [1];  [1]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. North Carolina State Univ., Raleigh, NC (United States)
  3. Gatan Inc., Pleasanton, CA (United States)
  4. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Double perovskites of the form R2BB'O6 (where R is a rare earth cation and B and B' are chemically distinct transition metal cations with half-filled and empty eg orbitals, respectively) are of significant interest for their magnetoelectric properties. La2MnNiO6 is particularly attractive because of its large expected ferromagnetic moment per formula unit (5 μB f.u.–1) and its semiconducting character. If the ideal structure nucleates, superexchange coupling can take place via the B—O—B' bonds that form, and the moment per formula unit can attain its maximum theoretical value. However, we show that even in the case of layer-by-layer deposition via molecular beam epitaxy, the system can follow multiple reaction pathways that lead to deviations from the double perovskite structure. In particular, we observe a spatially extended phase in which B-site cation disorder occurs, resulting in Mn—O—Mn and Ni—O—Ni antiferromagnetic domains, as well as the formation of quasi-epitaxial, antiferromagnetic NiO nanoscale inclusions, surrounded by a Mn-rich double perovskite. The coexistence of the double perovskite and secondary phases in oxygen deficient conditions is supported by first-principles modeling. However, extended annealing in air restores long-range B-site order and begins to dissolve the NiO inclusions, yielding an ideal structure and an enhanced ferromagnetic moment. Furthermore, this study reveals fundamental structure–property relationships that may not be apparent during the design phase of a multielement crystalline solid and illustrates how to engineer a synthetic path to a desired product.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
AC04-94AL85000; DMR-1350273; AC02-06CH11357
OSTI ID:
1257486
Journal Information:
Chemistry of Materials, Vol. 28, Issue 11; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 22 works
Citation information provided by
Web of Science

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Cited By (4)

Interface Engineered Room‐Temperature Ferromagnetic Insulating State in Ultrathin Manganite Films journal November 2019
Role of spontaneous strains on the biphasic nature of partial B-site disorder double perovskite La 2 NiMnO 6 journal June 2018
Interface Engineered Room-Temperature Ferromagnetic Insulating State in Ultrathin Manganite Films. text January 2020
Interface Engineered Room-Temperature Ferromagnetic Insulating State in Ultrathin Manganite Films. text January 2019