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Translated title of the contribution | Sol-Gel-Prozess-basierte Schmelzflusssynthese von plattenartigen La2NiO4+δ Partikeln |
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Original language | English |
Article number | 1346 |
Number of pages | 24 |
Journal | Crystals |
Volume | 12 |
Issue number | 10 |
Publication status | Published - 24 Sept 2022 |
Abstract
Keywords
- crystal growth, crystal morphology, La2NiO4+δ, molten-flux synthesis, Sol-gel process, sol–gel process, La NiO, NaOH melt
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Condensed Matter Physics
- Chemical Engineering(all)
- Materials Science(all)
- Chemistry(all)
- Inorganic Chemistry
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In: Crystals, Vol. 12, No. 10, 1346, 24.09.2022.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Sol–Gel-Process-Based Molten-Flux Synthesis of Plate-like La2NiO4+δ Particles
AU - Escobar Cano, Giamper Eliseo
AU - Brinkmann, Yannick
AU - Zhao, Zhijun
AU - Kißling, Patrick André
AU - Feldhoff, Armin
N1 - Funding Information: This research was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)—project number 435833397.
PY - 2022/9/24
Y1 - 2022/9/24
N2 - La2NiO4+δ particles with a plate-like morphology were prepared from a NaOH melt by molten-flux synthesis. For this purpose, the intermediates from a sol–gel process were used as reactants. Using powder X-ray diffraction, the sol–gel intermediates were identified as a mixture of tetragonal La2O2CO3 and cubic NiO. The existence of NiO was also confirmed by transmission electron microscopy in combination with electron-energy loss spectroscopy. The ultrafine mixed sol–gel intermediates were then mixed with NaOH powder and additional water in a nickel crucible and heated to 673 K for 8 h. The chemical reactions in the air during the molten-flux synthesis and the influence of the salt on the formation of La2NiO4+δ were examined by thermogravimetric analysis. The powder X-ray diffraction indicated a K2NiF4-type tetragonal structure with the I4/mmm space group for the reaction product. The scanning electron microscopy showed plate-like La2NiO4+δ crystals with a length and thickness of approximately 9 µm and 2 µm, respectively, while the energy-dispersive X-ray spectroscopy revealed a homogeneous distribution of lanthanum and nickel in the product powder. The influence of the processing parameters on the product generation, as well as on the size and morphology of the La2NiO4+δ particles, was systematically studied.
AB - La2NiO4+δ particles with a plate-like morphology were prepared from a NaOH melt by molten-flux synthesis. For this purpose, the intermediates from a sol–gel process were used as reactants. Using powder X-ray diffraction, the sol–gel intermediates were identified as a mixture of tetragonal La2O2CO3 and cubic NiO. The existence of NiO was also confirmed by transmission electron microscopy in combination with electron-energy loss spectroscopy. The ultrafine mixed sol–gel intermediates were then mixed with NaOH powder and additional water in a nickel crucible and heated to 673 K for 8 h. The chemical reactions in the air during the molten-flux synthesis and the influence of the salt on the formation of La2NiO4+δ were examined by thermogravimetric analysis. The powder X-ray diffraction indicated a K2NiF4-type tetragonal structure with the I4/mmm space group for the reaction product. The scanning electron microscopy showed plate-like La2NiO4+δ crystals with a length and thickness of approximately 9 µm and 2 µm, respectively, while the energy-dispersive X-ray spectroscopy revealed a homogeneous distribution of lanthanum and nickel in the product powder. The influence of the processing parameters on the product generation, as well as on the size and morphology of the La2NiO4+δ particles, was systematically studied.
KW - crystal growth
KW - crystal morphology
KW - La2NiO4+δ
KW - molten-flux synthesis
KW - Sol-gel process
KW - sol–gel process
KW - La NiO
KW - NaOH melt
UR - http://www.scopus.com/inward/record.url?scp=85140924535&partnerID=8YFLogxK
U2 - 10.3390/cryst12101346
DO - 10.3390/cryst12101346
M3 - Article
VL - 12
JO - Crystals
JF - Crystals
SN - 2073-4352
IS - 10
M1 - 1346
ER -