On the structural stability of crystalline ceria phases in undoped and acceptor-doped ceria materials under in situ reduction conditions

Bekheet, Maged F.; Grünbacher, Matthias; Schlicker, Lukas; Gili, Albert; Doran, Andrew; Epping, Jan Dirk; Gurlo, Aleksander; Klötzer, Bernhard; Penner, Simon

doi:10.1039/c8ce01726c

Title: On the structural stability of crystalline ceria phases in undoped and acceptor-doped ceria materials under in situ reduction conditions

Journal Article · Mon Dec 03 00:00:00 EST 2018 · CrystEngComm

DOI:https://doi.org/10.1039/c8ce01726c· OSTI ID:1656492

^[1]; Grünbacher, Matthias ^[2];

^[1];

^[3]; Epping, Jan Dirk ^[4];

^[1]; Klötzer, Bernhard ^[2];

^[2]

Technische Univ. Berlin (Germany). Fachgebiet Keramische Werkstoffe, Inst. für Werkstoffwissenschaften und-technologien
Univ. of Innsbruck (Austria). Inst. of Physical Chemistry
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Technische Univ. Berlin (Germany). Fakultät II: Mathematik & Naturwissenschaften, Inst. für Chemie

The reduction of pure and Sm-doped ceria in hydrogen has been studied by synchrotron-based in situ X-ray diffraction to eventually prove or disprove the presence of crystalline cerium hydride (CeH_x) phases and the succession of potential structural phase (trans)formations of reduced cerium oxide phases during heating-cooling cycles up to 1273 K. Despite a recent report on the existence of bulk and surface CeH_x phases during reductive treatment of pure CeO₂ in H₂, structural analysis by Rietveld refinement as well as additional ¹H-NMR spectroscopy did not reveal the presence of any crystalline CeH_x phase. Rather, a sequence of phase transformations during the re-cooling process in H₂ has been observed. In both samples, the reduced/defective fluorite lattice undergoes at first a transformation into a bixbyite-type lattice with a formal stoichiometry Ce_0.58³⁺Ce_0.42⁴⁺O_1.71 and Sm_0.15³⁺Ce_0.39³⁺Ce_0.46⁴⁺O_1.73, before a transformation into rhombohedral Ce₇O₁₂ takes place in pure CeO₂. This phase is clearly absent for the Sm-doped material. Finally, a triclinic Ce₁₁O₂₀ phase appears for both materials, which can be recovered to room temperature, and on which a phase mixture of bixbyite Ce_0.66³⁺Ce_0.34⁴⁺O_1.67, rh-Ce_0.60³⁺Ce_0.40⁴⁺O_1.70 and tri-Ce_0.48³⁺Ce_0.52⁴⁺O_1.76 (for pure CeO₂) or bixbyite Sm_0.15³⁺Ce_0.47³⁺Ce_0.38⁴⁺O_1.69 and tri-Sm_0.15³⁺Ce_0.31³⁺Ce_0.54⁴⁺O_1.77 (for Sm-doped CeO₂) prevails. The absence of the rhombohedral phase indicates that Sm doping leads to the stabilization of the bixbyite phase over the rhombohedral one at this particular oxygen vacancy concentration. It is worth noting that recent work proves that hydrogen is indeed incorporated within the structures during the heat treatments, but under the chosen experimental conditions it has apparently no effect on the salient structural principles during reduction.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES), Scientific User Facilities Division; Austrian Science Fund (FWF)

Grant/Contract Number:: AC02-05CH11231; F4503-N16

OSTI ID:: 1656492

Journal Information:: CrystEngComm, Vol. 21, Issue 1; ISSN 1466-8033

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 21 works

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