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  Low Temperature Formation of Ruddlesden–Popper-Type Layered La2CoO4±δ Perovskite Monitored via In Situ X-ray Powder Diffraction

Ortatatlı, Ş., Ternieden, J., & Weidenthaler, C. (2018). Low Temperature Formation of Ruddlesden–Popper-Type Layered La2CoO4±δ Perovskite Monitored via In Situ X-ray Powder Diffraction. European Journal of Inorganic Chemistry, 2018(48), 5238-5245. doi:10.1002/ejic.201801162.

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 Urheber:
Ortatatlı, Şeyma1, Autor           
Ternieden, Jan1, Autor           
Weidenthaler, Claudia1, Autor           
Affiliations:
1Research Group Weidenthaler, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1950291              

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Schlagwörter: Ruddlesden-Popper phases; Perovskite phases; Structure elucidation; Phase transitions
 Zusammenfassung: In this contribution low temperature formation of Ruddlesden–Popper (RP)-type layered La2CoO4±δ perovskite was optimized via in situ X-ray powder diffraction (XRPD). Starting from LaCoO3 a stoichiometric transformation to La2CoO4±δ and CoO can be achieved by controlled reduction with H2. The challenge of this reaction is the use of appropriate amounts of H2 in a defined temperature region. If the amount of H2 is too high, complete reduction of the perovskite occurs. If temperatures are not appropriate, intermediate phases seem to hinder the transformation La2CoO4±δ or lead to a complete decomposition to simple oxides. Based on in situ XRPD experiments, the temperature window and required amount of H2 for the transformation of LaCoO3 to La2CoO4±δ were determined. Systematic experiments reveal that 650 °C is the optimal temperature for the complete transformation of LaCoO3 into La2CoO4±δ and CoO/Co0. The information was then transferred to realize bulk synthesis of La2CoO4±δ at 650 °C in a tube furnace without extended heat treatments at elevated temperatures.

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Sprache(n): eng - English
 Datum: 2018-09-212018-10-192018-10-192018-12-31
 Publikationsstatus: Erschienen
 Seiten: 8
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1002/ejic.201801162
 Art des Abschluß: -

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Titel: European Journal of Inorganic Chemistry
  Kurztitel : Eur. J. Inorg. Chem.
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: Weinheim, Germany : Wiley-VCH
Seiten: - Band / Heft: 2018 (48) Artikelnummer: - Start- / Endseite: 5238 - 5245 Identifikator: ISSN: 1434-1948
CoNE: https://pure.mpg.de/cone/journals/resource/954926953810_1