Characterization of the Alkoxide-based Sol-gel Derived La9.33Si6O26 Powder and Ceramic
Abstract
In this study, we report on the acid-catalysed synthesis of La9.33Si6O26 from lanthanum nitrate or acetate and silicon ethoxide (TEOS) in the ethanol solvent, upon the transition from liquid to amorphous and crystalline phases. The similarity of the Fourier transform infrared spectra of the lanthanum-salt solutions and lanthanum-silicon sols indicates that the lanthanum environment is not changed in the reaction of the La-salt with TEOS. In the nitric-acid catalysed synthesis, the hydrolysis reaction was almost instantaneous, as a consequence of a higher amount of water in this system, which contributed to a high level of chemical heterogeneity in the product. The acetic acid-based synthesis ensured a good mixing of the reagents at the nanometre level, which gave rise to the formation of the pure La9.33Si6O26 powder upon heating at 900 degrees C, and single phase ceramics with 94 % relative density after sintering at 1400 degrees C for 3 h in air, which is 200 degrees C lower temperatu...re then usually reported for the apatite material.
Keywords:
X-ray diffraction / sol-gel process / La9.33Si6O26 apatite / fuel cells / FTIRSource:
Acta Chimica Slovenica, 2014, 61, 3, 530-541Publisher:
- Slovensko Kemijsko Drustvo, Ljubljana
Funding / projects:
- Slovenian research agencySlovenian Research Agency - Slovenia [P2-0105]
- foundation of the University of Limoges
Collections
Institution/Community
Institut za multidisciplinarna istraživanjaTY - JOUR AU - Vojisavljević, Katarina AU - Chevreux, Pierrick AU - Jouin, Jenny AU - Malic, Barbara PY - 2014 UR - http://rimsi.imsi.bg.ac.rs/handle/123456789/747 AB - In this study, we report on the acid-catalysed synthesis of La9.33Si6O26 from lanthanum nitrate or acetate and silicon ethoxide (TEOS) in the ethanol solvent, upon the transition from liquid to amorphous and crystalline phases. The similarity of the Fourier transform infrared spectra of the lanthanum-salt solutions and lanthanum-silicon sols indicates that the lanthanum environment is not changed in the reaction of the La-salt with TEOS. In the nitric-acid catalysed synthesis, the hydrolysis reaction was almost instantaneous, as a consequence of a higher amount of water in this system, which contributed to a high level of chemical heterogeneity in the product. The acetic acid-based synthesis ensured a good mixing of the reagents at the nanometre level, which gave rise to the formation of the pure La9.33Si6O26 powder upon heating at 900 degrees C, and single phase ceramics with 94 % relative density after sintering at 1400 degrees C for 3 h in air, which is 200 degrees C lower temperature then usually reported for the apatite material. PB - Slovensko Kemijsko Drustvo, Ljubljana T2 - Acta Chimica Slovenica T1 - Characterization of the Alkoxide-based Sol-gel Derived La9.33Si6O26 Powder and Ceramic EP - 541 IS - 3 SP - 530 VL - 61 UR - https://hdl.handle.net/21.15107/rcub_rimsi_747 ER -
@article{ author = "Vojisavljević, Katarina and Chevreux, Pierrick and Jouin, Jenny and Malic, Barbara", year = "2014", abstract = "In this study, we report on the acid-catalysed synthesis of La9.33Si6O26 from lanthanum nitrate or acetate and silicon ethoxide (TEOS) in the ethanol solvent, upon the transition from liquid to amorphous and crystalline phases. The similarity of the Fourier transform infrared spectra of the lanthanum-salt solutions and lanthanum-silicon sols indicates that the lanthanum environment is not changed in the reaction of the La-salt with TEOS. In the nitric-acid catalysed synthesis, the hydrolysis reaction was almost instantaneous, as a consequence of a higher amount of water in this system, which contributed to a high level of chemical heterogeneity in the product. The acetic acid-based synthesis ensured a good mixing of the reagents at the nanometre level, which gave rise to the formation of the pure La9.33Si6O26 powder upon heating at 900 degrees C, and single phase ceramics with 94 % relative density after sintering at 1400 degrees C for 3 h in air, which is 200 degrees C lower temperature then usually reported for the apatite material.", publisher = "Slovensko Kemijsko Drustvo, Ljubljana", journal = "Acta Chimica Slovenica", title = "Characterization of the Alkoxide-based Sol-gel Derived La9.33Si6O26 Powder and Ceramic", pages = "541-530", number = "3", volume = "61", url = "https://hdl.handle.net/21.15107/rcub_rimsi_747" }
Vojisavljević, K., Chevreux, P., Jouin, J.,& Malic, B.. (2014). Characterization of the Alkoxide-based Sol-gel Derived La9.33Si6O26 Powder and Ceramic. in Acta Chimica Slovenica Slovensko Kemijsko Drustvo, Ljubljana., 61(3), 530-541. https://hdl.handle.net/21.15107/rcub_rimsi_747
Vojisavljević K, Chevreux P, Jouin J, Malic B. Characterization of the Alkoxide-based Sol-gel Derived La9.33Si6O26 Powder and Ceramic. in Acta Chimica Slovenica. 2014;61(3):530-541. https://hdl.handle.net/21.15107/rcub_rimsi_747 .
Vojisavljević, Katarina, Chevreux, Pierrick, Jouin, Jenny, Malic, Barbara, "Characterization of the Alkoxide-based Sol-gel Derived La9.33Si6O26 Powder and Ceramic" in Acta Chimica Slovenica, 61, no. 3 (2014):530-541, https://hdl.handle.net/21.15107/rcub_rimsi_747 .