Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10637/14825
Registro completo de metadatos
Campo DC Valor Lengua/Idioma
dc.contributor.otherUniversidad San Pablo-CEU. Facultad de Farmacia-
dc.creatorCepeda-Sanchez, Nayeli M.-
dc.creatorDiaz-Guillen, Jose A.-
dc.creatorMaczka, Miroslaw-
dc.creatorAmador Elizondo, Ulises Julio-
dc.creatorFuentes, Antonio F.-
dc.date.accessioned2024-01-12T11:07:24Z-
dc.date.available2024-01-12T11:07:24Z-
dc.date.issued2018-05-10-
dc.identifier.citationCepeda-Sanchez, Nayeli M.; Diaz-Guillen, Jose A.; Maczka, Miroslaw; Amador, Ulises; Fuentes, Antonio F. Cations size mismatch versus bonding characteristics: synthesis, structure and oxygen ion conducting properties of pyrochlore-type lanthanide hafnates. J Mater Sci 53, 13513–13529 (2018). DOI: 10.1007/s10853-018-2402-5es_ES
dc.identifier.issn1573-4803-
dc.identifier.urihttp://hdl.handle.net/10637/14825-
dc.description.abstractThis work describes the synthesis, structural characterization and electrical properties of solid solutions with the general formula Gd2Hf2−xBxO7, where B = Ti4+, Sn4+ and Zr4+. All samples were successfully prepared in ~ 30 h, via a mechanochemical reaction in a planetary ball mill, using the corresponding elemental oxides as starting chemicals. The XRD and Raman spectroscopy analysis of the title samples revealed that on firing at 1500 °C Hf4+ substitution by Sn4+ and Ti4+ produces better ordered pyrochlore structures and decreases the electrical conductivity of Gd2Hf2O7 by more than two orders of magnitude (from 2.7 × 10−4 at 700 °C to 8.71 × 10−7 and 1.12 × 10−6 Sm cm−1, for Gd2Sn2O7 and Gd2Ti2O7, respectively). By contrast, the Gd2Hf2−xZrxO7 system remains disordered with conductivity increasing by almost an order of magnitude and reaching a value for Gd2Zr2O7 of 1.55 × 10−3 Sm cm−1 at 700 °C, whereas the activation energy for oxygen migration decreases in both, the Sn- and Ti-containing systems, and increases slightly in the Zr-containing solid solution. These changes cannot be only explained when taking into account the cations size ratio criteria; the covalency of the <B–O> metal bond plays also a key role in determining the structural characteristics and electrical properties of the title three systems.en_EN
dc.formatapplication/format-
dc.language.isoen-
dc.publisherSpringer-
dc.relation.ispartofJournal of Materials Science-
dc.rightshttp://creativecommons.org/licenses/by-nc-nd/4.0/deed.es-
dc.subjectCation Size Mismatchen_EN
dc.subjectGd Hfen_EN
dc.subjectGd 2Hf 2Oen_EN
dc.subjectPyrochlore Structureen_EN
dc.subjectXb Xoen_EN
dc.titleCations size mismatch versus bonding characteristics: synthesis, structure and oxygen ion conducting properties of pyrochlore-type lanthanide hafnatesen_EN
dc.typeArtículo-
dc.relation.projectIDCONACYT (Grants CB2013-01-221701)-
dc.centroUniversidad San Pablo-CEU-
Aparece en las colecciones: Facultad de Farmacia




Los ítems de DSpace están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.