TU Darmstadt / ULB / TUbiblio

Room‐Temperature Synthesis of a Compositionally Complex Rare‐Earth Carbonate Hydroxide and its Conversion into a Bixbyite‐Type High‐Entropy Sesquioxide

Bernauer, Jan ; Trapp, Maximilian ; Wiehl, Leonore ; Kleebe, Hans‐Joachim ; Ionescu, Emanuel (2024)
Room‐Temperature Synthesis of a Compositionally Complex Rare‐Earth Carbonate Hydroxide and its Conversion into a Bixbyite‐Type High‐Entropy Sesquioxide.
In: European Journal of Inorganic Chemistry, 2024, 27 (3)
doi: 10.26083/tuprints-00027106
Artikel, Zweitveröffentlichung, Verlagsversion

WarnungEs ist eine neuere Version dieses Eintrags verfügbar.

Kurzbeschreibung (Abstract)

In the present work, the solvent‐deficient synthesis of the high‐entropy rare‐earth carbonate hydroxide RE(CO₃)(OH) (RE=La, Ce, Pr, Nd, Sm, and Gd) and its thermal conversion into bixbyite‐type sesquioxide RE₂O₃ are reported for the first time. The high‐entropy rare earth carbonate hydroxide was prepared via mechanochemical reaction of the corresponding metal nitrate hydrates with ammonium hydrogen carbonate followed by the removal of the NH₄NO₃ by‐product. Calcination of the carbonate hydroxide precursor in ambient atmosphere at temperatures in the range from 500 to 1000 °C led to the high‐entropy rare earth sesquioxide which exhibited a bixbyite‐type structure (Ia3) independent of the calcination temperature. Transmission electron microscopy (TEM) investigation revealed the homogeneous distribution of all six rare earth cations in the high‐entropy sesquioxide lattice, however, with some compositional variation between individual grains. The bixbyite‐type structure may be considered as the result of heavy doping of the fluorite‐type CeO₂ lattice with the other rare earth cations, which leads to a high concentration of oxygen vacancies, as revealed by electron diffraction and Raman spectroscopy data. The solvent‐deficient synthesis method used in the present study is considered as a valuable, straightforward and easily up‐scalable method to synthesize compositionally complex oxide ceramics.

Typ des Eintrags: Artikel
Erschienen: 2024
Autor(en): Bernauer, Jan ; Trapp, Maximilian ; Wiehl, Leonore ; Kleebe, Hans‐Joachim ; Ionescu, Emanuel
Art des Eintrags: Zweitveröffentlichung
Titel: Room‐Temperature Synthesis of a Compositionally Complex Rare‐Earth Carbonate Hydroxide and its Conversion into a Bixbyite‐Type High‐Entropy Sesquioxide
Sprache: Englisch
Publikationsjahr: 17 Juni 2024
Ort: Darmstadt
Publikationsdatum der Erstveröffentlichung: 22 Januar 2024
Ort der Erstveröffentlichung: Weinheim
Verlag: Wiley-VCH
Titel der Zeitschrift, Zeitung oder Schriftenreihe: European Journal of Inorganic Chemistry
Jahrgang/Volume einer Zeitschrift: 27
(Heft-)Nummer: 3
Kollation: 8 Seiten
DOI: 10.26083/tuprints-00027106
URL / URN: https://tuprints.ulb.tu-darmstadt.de/27106
Zugehörige Links:
Herkunft: Zweitveröffentlichung DeepGreen
Kurzbeschreibung (Abstract):

In the present work, the solvent‐deficient synthesis of the high‐entropy rare‐earth carbonate hydroxide RE(CO₃)(OH) (RE=La, Ce, Pr, Nd, Sm, and Gd) and its thermal conversion into bixbyite‐type sesquioxide RE₂O₃ are reported for the first time. The high‐entropy rare earth carbonate hydroxide was prepared via mechanochemical reaction of the corresponding metal nitrate hydrates with ammonium hydrogen carbonate followed by the removal of the NH₄NO₃ by‐product. Calcination of the carbonate hydroxide precursor in ambient atmosphere at temperatures in the range from 500 to 1000 °C led to the high‐entropy rare earth sesquioxide which exhibited a bixbyite‐type structure (Ia3) independent of the calcination temperature. Transmission electron microscopy (TEM) investigation revealed the homogeneous distribution of all six rare earth cations in the high‐entropy sesquioxide lattice, however, with some compositional variation between individual grains. The bixbyite‐type structure may be considered as the result of heavy doping of the fluorite‐type CeO₂ lattice with the other rare earth cations, which leads to a high concentration of oxygen vacancies, as revealed by electron diffraction and Raman spectroscopy data. The solvent‐deficient synthesis method used in the present study is considered as a valuable, straightforward and easily up‐scalable method to synthesize compositionally complex oxide ceramics.

Alternatives oder übersetztes Abstract:
Alternatives AbstractSprache

A compositionally complex (high-entropy) rare earth carbonate hydroxide was synthesized for the first time via a mechano-chemical approach at room temperature. Its calcination at temperatures beyond 500 °C leads to the formation of a bixbyite-type high-entropy oxide.

Englisch
Freie Schlagworte: bixbyite-type structure, ceramics, high-entropy oxides, solvent-deficient synthesis, rare earths
ID-Nummer: Artikel-ID: e202300330
Status: Verlagsversion
URN: urn:nbn:de:tuda-tuprints-271061
Zusätzliche Informationen:

In honor of the professional achievements of Prof. Rainer Streubel (University of Bonn, Germany)

Sachgruppe der Dewey Dezimalklassifikatin (DDC): 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften
600 Technik, Medizin, angewandte Wissenschaften > 660 Technische Chemie
Fachbereich(e)/-gebiet(e): 11 Fachbereich Material- und Geowissenschaften
11 Fachbereich Material- und Geowissenschaften > Geowissenschaften
11 Fachbereich Material- und Geowissenschaften > Geowissenschaften > Fachgebiet Geomaterialwissenschaft
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe
Hinterlegungsdatum: 17 Jun 2024 12:44
Letzte Änderung: 18 Jun 2024 08:16
PPN:
Export:
Suche nach Titel in: TUfind oder in Google

Verfügbare Versionen dieses Eintrags

Frage zum Eintrag Frage zum Eintrag

Optionen (nur für Redakteure)
Redaktionelle Details anzeigen Redaktionelle Details anzeigen