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Title: Rare-Earth Zirconate Ln2Zr2O7 (Ln: La, Nd, Gd, and Dy) Powders, Xerogels, and Aerogels: Preparation, Structure, and Properties
Authors: Torres-Rodríguez, Jorge Alberto 
Gutierrez Cano, Vanessa 
Menelaou, Melita 
Kastyl, Jaroslav 
Cihlář, Jaroslav 
Tkachenko, Serhii 
González, Jesús Antonio 
Kalmár, József 
Fabian, Istvan 
Lázár, István 
Čelko, Ladislav 
Kaiser, Jozef 
Major Field of Science: Natural Sciences
Field Category: Chemical Engineering
Keywords: Zirconate;Powders;xerogels;aerogels
Issue Date: 4-Nov-2019
Source: Inorganic Chemistry, vol.58, no.21, pp.14467-14477, 4 November 2019
Volume: vol.58
Issue: no.21
Start page: 14467
End page: 14477
Journal: Inorganic Chemistry 
Abstract: The physicochemical properties of rare-earth zirconates can be tuned by the rational modification of their structures and phase compositions. In the present work, La3+-, Nd3+-, Gd3+-, and Dy3+-zirconate nanostructured materials were prepared by different synthetic protocols, leading to powders, xerogels, and, for the first time, monolithic aerogels. Powders were synthesized by the co-precipitation method, while xerogels and aerogels were synthesized by the sol-gel technique, followed by ambient and supercritical drying, respectively. Their microstructures, thermogravimetric profiles, textural properties, and crystallographic structures are reported. The co-precipitation method led to dense powders (SBET < 1 m2 g-1), while the sol-gel technique resulted in large surface area xerogels (SBET = 144 m2 g-1) and aerogels (SBET = 168 m2 g-1). In addition, the incorporation of lanthanide ions into the zirconia lattice altered the crystal structures of the powders, xerogels, and aerogels. Single-phase pyrochlores were obtained for La2Zr2O7 and Nd2Zr2O7 powders and xerogels, while defect fluorite structures formed in the case of Gd2Zr2O7 and Dy2Zr2O7. All aerogels contain a mixture of cubic and tetragonal ZrO2 phases. Thus, a direct effect is shown between the drying conditions and the resulting crystalline phases of the nanostructured rare-earth zirconates.
Description: Funding number: CEITEC 2020,LQ1601
ISSN: 0020-1669
DOI: 10.1021/acs.inorgchem.9b01965
Rights: © 2019 American Chemical Society
Attribution-NonCommercial-NoDerivatives 4.0 International
Type: Article
Affiliation : Brno University of Technology 
University of Cantabria 
University of Debrecen 
MTA-DE Redox and Homogeneous Catalytic Reaction Mechanisms Research Group 
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