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Determining the Oxygen Stoichiometry of Cobaltite Thin Films

Journal Article · · Chemistry of Materials
 [1];  [2];  [3];  [4];  [2];  [5];  [6];  [6];  [7];  [5];  [4];  [3];  [2];  [8]
  1. Univ. of Chicago, IL (United States)
  2. Univ. of California, Davis, CA (United States)
  3. Univ. of California San Diego, La Jolla, CA (United States); Univ. of California San Diego, La Jolla, CA (United States). Center for Advanced Nanoscience
  4. Univ. of California San Diego, La Jolla, CA (United States)
  5. Purdue Univ., West Lafayette, IN (United States)
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  7. Argonne National Lab. (ANL), Lemont, IL (United States). Advanced Photon Source (APS)
  8. Univ. of Chicago, IL (United States); Argonne National Lab. (ANL), Lemont, IL (United States)
Transition metal oxides (TMO) are promising materials to realize low-power neuromorphic devices. Their physical properties critically depend on their oxygen vacancy concentrations, whose experimental determination remains a challenging task. Here we focus on cobaltites, in particular La1-xSrxCoO3-d (LSCO), and we present a strategy to identify fingerprints of oxygen vacancies in X-ray absorption (XA) spectra. Using a combination of experiment and theory, we show that the variation of the oxygen vacancy concentration in the perovskite phase of LSCO is correlated with the change of the relative peak positions of the O K-edge XA spectra. Furthermore, we also identify an additional geometrical fingerprint that captures both the changes of the Co-O bond length and Co-O-Co bond angle in the material due to the presence of oxygen vacancies. Finally, we predict the oxygen vacancy concentration of experimental samples and show how the resistivity of the oxide material may be tuned as a function of the defect concentration present in the system.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science, Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231; AC02-06CH11357; SC0019273
OSTI ID:
1868557
Journal Information:
Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 5 Vol. 34; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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