RT Journal Article
T1 Doping effects on the structure and electrical properties of La2Ce2O7 proton conductors.
A1 Zamudio-García, Javier
A1 Dos-Santos-Gómez, Lucía
A1 Porras-Vázquez, José Manuel
A1 Ramírez-Losilla, Enrique
A1 Marrero-López, David
K1 Electrólitos - Conductividad
K1 Protones
AB Recent studies have reported that the conductivity of La2Ce2O7 proton conductors is improved by aliovalentdoping, despite the high concentration of oxygen vacancies in the pristine material. In this study,we provide new insights into the structural and conducting properties of La2-x AxCe2O7±d (A ¼ Naþ, Ca2þ,Sr2þ, Ba2þ, Y3þ and W6þ; x  0.2). The materials are apparently single phase compounds with a disorderedfluorite-type structure by conventional X-ray diffraction; however, the local structure, studied byRaman spectroscopy, reveals a biphasic mixture of fluorite and C-type phases, which depends on dopanttype and the sintering temperature. In addition, phase segregations are observed for Ca, Sr and Ba-dopedsamples by scanning electron microscopy. The different substitutions do not improve the bulk conductionat low temperature, and the conductivity differences between the samples are mainly ascribed tomicrostructural changes. High sintering temperatures produce a significant reduction of the bulk conductivity,i.e. 1.38 and 1.01 mS cm 1 at 300  C for samples sintered at 1400 and 1500  C, respectively. Theuse of Zn as sintering aid greatly improves the densification of La2Ce2O7 at lower temperature, withoutaffecting negatively the conductivity.
PB Elsevier
YR 2020
FD 2020-01-01
LK https://hdl.handle.net/10630/28444
UL https://hdl.handle.net/10630/28444
LA eng
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 20 ene 2026