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

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Free keywords: Ruddlesden-Popper phases; Perovskite phases; Structure elucidation; Phase transitions
 Abstract: 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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Language(s): eng - English
 Dates: 2018-09-212018-10-192018-10-192018-12-31
 Publication Status: Published in print
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1002/ejic.201801162
 Degree: -

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Title: European Journal of Inorganic Chemistry
  Abbreviation : Eur. J. Inorg. Chem.
Source Genre: Journal
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Publ. Info: Weinheim, Germany : Wiley-VCH
Pages: - Volume / Issue: 2018 (48) Sequence Number: - Start / End Page: 5238 - 5245 Identifier: ISSN: 1434-1948
CoNE: https://pure.mpg.de/cone/journals/resource/954926953810_1