TY - JOUR
T1 - Controllable decomposition of lanthanum oxychloride through different annealing conditions
AU - Zhu, Xiurong
AU - Hope-Weeks, Louisa J.
AU - Ramirez, Donald
AU - Baghi, Roya
AU - Charles, Vanessa R.
AU - He, Yinjie
N1 - Funding Information:
The authors gratefully acknowledge the Texas Tech University Imaging Center , Department of Biological Sciences , for use of the Hitachi S-4300; the authors also gratefully acknowledge the Department of Chemistry & Biochemistry at Texas Tech University for use of the Rigaku Ultima III X-ray powder diffractometer. The authors would also like to personally thank Dr. Dominick J. Casadonte for use of Shimadzu 8400s Fourier transform infrared spectrometer. This research was financially supported by the National Natural Science Foundation of China (No. 51762003 , 11647101 ) and the Youth Fund of Science and Technology Department of Jiangxi Province (No. GJJ160940 , GJJ13652 ), the authors are exceedingly grateful.
Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/9/5
Y1 - 2019/9/5
N2 - Monolithic Lanthanum (La)-based aerogels were successfully synthesized by using the facile epoxide addition method. The as-prepared La-based aerogels were then annealed under different annealing conditions (temperature and atmosphere). The scanning electron microscopy images indicate that the as-prepared La-based aerogels are nanoporous amorphous materials with a density of ∼60 mg cm−3. Powder X-ray diffraction confirmed that lanthanum oxychloride (LaOCl) particles were formed at 500 °C in both static air and N2, and decomposed to La2O3 at ∼700 °C in static air but remained stable until ∼900 °C in N2. At 1050 °C, the LaOCl particles were completely converted to La2O3 particles in static air, while under a nitrogen atmosphere the material retained the LaOCl structure well until a conversion to the oxide. These conversions were further explored using Fourier transform infrared and photoluminescence spectroscopy. Lastly, the influence of annealing conditions on the microstructure and porosity of the La-based aerogels were also investigated.
AB - Monolithic Lanthanum (La)-based aerogels were successfully synthesized by using the facile epoxide addition method. The as-prepared La-based aerogels were then annealed under different annealing conditions (temperature and atmosphere). The scanning electron microscopy images indicate that the as-prepared La-based aerogels are nanoporous amorphous materials with a density of ∼60 mg cm−3. Powder X-ray diffraction confirmed that lanthanum oxychloride (LaOCl) particles were formed at 500 °C in both static air and N2, and decomposed to La2O3 at ∼700 °C in static air but remained stable until ∼900 °C in N2. At 1050 °C, the LaOCl particles were completely converted to La2O3 particles in static air, while under a nitrogen atmosphere the material retained the LaOCl structure well until a conversion to the oxide. These conversions were further explored using Fourier transform infrared and photoluminescence spectroscopy. Lastly, the influence of annealing conditions on the microstructure and porosity of the La-based aerogels were also investigated.
KW - Annealing temperature
KW - Lanthanum oxychloride
KW - Propylene oxide
KW - Rare earth
KW - Sol-gel
UR - http://www.scopus.com/inward/record.url?scp=85067028400&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2019.06.071
DO - 10.1016/j.jallcom.2019.06.071
M3 - Article
AN - SCOPUS:85067028400
SN - 0925-8388
VL - 800
SP - 29
EP - 34
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -