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Phase transitions of BaTi0.9Rh0.1O3±δ perovskite-type oxides under reducing environments

Mondragón Rodríguez, G.C. and Gönüllü, Yakup and Ferri, D. and Eyssler, Arnim and Otal, Eugenio and Saruhan, B. (2015) Phase transitions of BaTi0.9Rh0.1O3±δ perovskite-type oxides under reducing environments. Materials Research Bulletin (61), pp. 130-135. Elsevier. DOI: [10.1016/j.materresbull.2014.10.007] ISSN 0025-5408

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Abstract

Perovskite-type oxides of composition BaTi0.9Rh0.1O3±δ were prepared following a new chemical route that avoids the formation of hydroxyl species and precipitation, and allows the homogeneous distribution of Rh in the final mixed metal oxide. The high dispersion of Rh and the formation of the solid solution between Rh and the BaTiO3 perovskite is confirmed by means of X-ray diffraction (XRD) and extended X-ray absorption fine structure spectroscopy (EXAFS). The presence of Rh stabilized the hexagonal BaTi0.9Rh0.1O3±δ phase, which decomposes into barium orthotitanate (BaTi2O4) and metallic Rh° in reducing environment. This phase transition starts already at 700 °C and is only partially completed at 900 °C suggesting that part of the Rh present in the perovskite lattice might not be easily reduced by hydrogen. These aspects and further open questions are discussed.

Item URL in elib:https://elib.dlr.de/91607/
Document Type:Article
Title:Phase transitions of BaTi0.9Rh0.1O3±δ perovskite-type oxides under reducing environments
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Mondragón Rodríguez, G.C.guillermo.mondragon-rodriguez (at) dlr.deUNSPECIFIED
Gönüllü, YakupUniversität zu KölnUNSPECIFIED
Ferri, D.Paul Scherrer InstitutUNSPECIFIED
Eyssler, ArnimEmpa, Swiss Federal Laboratories for Materials Science and TechnologyUNSPECIFIED
Otal, EugenioUTN-Facultad Regional Santa CruzUNSPECIFIED
Saruhan, B.WF DLRUNSPECIFIED
Date:January 2015
Journal or Publication Title:Materials Research Bulletin
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :[10.1016/j.materresbull.2014.10.007]
Page Range:pp. 130-135
Publisher:Elsevier
Series Name:Elsevier
ISSN:0025-5408
Status:Published
Keywords:Perovskite; Chemical synthesis; XAFS; Microstructure
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Turbine Technologies
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > High Temperature and Functional Coatings
Deposited By: Mondragon Rodriguez, Guillermo Cesar
Deposited On:06 Nov 2014 14:53
Last Modified:06 Sep 2019 15:30

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