Journal article
Effect of fluoropolymer composition on topochemical synthesis of SrMnO3-delta F gamma oxyfluoride films
Physical review materials, v 2(7)
31 Jul 2018
Abstract
We report the synthesis of SrMnO3-delta F gamma perovskite oxyfluoride thin films using a vapor transport method to fluorinate as-grown SrMnO2.5 epitaxial thin films. The influence of the fluoropolymer, which acts as a fluorine vapor source, was investigated by utilizing polyvinyl fluoride (PVF), polyvinylidene difluoride (PVDF), and polytetrafluoroethylene (PTFE) in the reaction. The same process was carried out with polyethylene to isolate the role of carbon in the vapor transport process. The F distribution was probed by x-ray photoemission spectroscopy, which confirmed the incorporation of F into the films and revealed higher F concentrations in films exposed to PVF and PVDF compared to PTFE. The c-axis parameter expands after fluorination, a result consistent with density functional theory calculations that attribute the volume expansion to elongated Mn-F bonds compared to shorter Mn-O bonds. Using x-ray absorption spectroscopy, we show that the fluorination process reduces the nominal Mn oxidation state suggesting that F substitutes on O sites in the lattice as opposed to filling anion vacancy sites, a finding further supported by calculated formation energies of different F site occupancies. These results provide insights into topochemical fluorination of perovskite oxides, which should enable future synthesis and design efforts focused on oxyfluoride heterostructures.
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Details
- Title
- Effect of fluoropolymer composition on topochemical synthesis of SrMnO3-delta F gamma oxyfluoride films
- Creators
- Jiayi Wang - Drexel UniversityYongjin Shin - Northwestern UniversityElke Arenholz - Lawrence Berkeley National LaboratoryBenjamin M. Lefler - Drexel UniversityJames M. Rondinelli - Northwestern UniversitySteven J. May - Drexel University
- Publication Details
- Physical review materials, v 2(7)
- Publisher
- Amer Physical Soc
- Number of pages
- 10
- Grant note
- DE-AC02-05CH11231 / DOE Office of Science User Facility; United States Department of Energy (DOE) W911NF-14-10493 / Army Research Office DURIP grant CMMI-1562223 / National Science Foundation (NSF) DMR-1454688 / NSF; National Science Foundation (NSF)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000440417500002
- Scopus ID
- 2-s2.0-85059619497
- Other Identifier
- 991019167587804721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary