The role of defects association in structural and transport properties of the Ce_(1-x)(Nd_(0.74)Tm_(0.26))_xO_(2-x/2) system

作     者：Cristina Artini Sabrina Presto Massimo Viviani Sara Massardo Maria Maddalena Carnasciali Lara Gigli Marcella Pani Cristina Artini;Sabrina Presto;Massimo Viviani;Sara Massardo;Maria Maddalena Carnasciali;Lara Gigli;Marcella Pani

作者机构：DCCIDepartment of Chemistry and Industrial ChemistryUniversity of GenovaVia Dodecaneso 3116146 GenovaItaly Institute of Condensed Matter Chemistry and Technologies for EnergyNational Research CouncilCNR-ICMATEVia De Marini 616149 GenovaItaly Institute of Condensed Matter Chemistry and Technologies for EnergyNational Research CouncilCNR-ICMATEc/o DICCA-UNIGEVia all’Opera Pia 1516145 GenovaItaly INSTMGenova Research UnitVia Dodecaneso 3116146 GenovaItaly Elettra-Sincrotrone Trieste S.C.p.A.ss 14km 163.534149 BasovizzaTriesteItaly CNR-SPIN GenovaCorso Perrone 2416152 GenovaItaly 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2021年第30卷第9期

页      面：494-502页

核心收录：

学科分类：081702[工学-化学工艺] 0808[工学-电气工程] 08[工学] 0817[工学-化学工程与技术] 

基　　金：financially supported by Compagnia di San Paolo  in the frame of the project COLEUS – ID ROL: 32604 

主　　题：Solid oxide fuel cells RE-doped ceria High resolution X-ray powder diffraction Rietveld refinement μ-Raman spectroscopy Impedance spectroscopy 

摘      要：An experimental investigation of the crystallographic,Raman and transport properties of the Ce_(1-x)(Nd_(0.74)Tm_(0.26))_xO_(2-x/2)(0.1≤x≤0.6) doped ceria system was performed with the aim of setting out correlations between structural features and ionic conductivity of the *** chosen composition ensures that the average size of the Nd^(3+) and Tm^(3+) doping ions coincides with the one of Sm^(3+);even so,the studied system presents larger cell parameters and a wider compositional extent of the CeO_(2)-based solid solution than Sm-doped ***,the occurrence of two different activation energies to ionic conduction below and above ~750 K determines the existence of two distinct conduction *** described experimental results agree with the formation below the threshold temperature of1 V_O2 Tm _(Ce) trimers,which promote the incorporation of Nd _(Ce) isolated defects into the CeO_(2)-based solid *** the high temperature range the dissociation of trimers induces the appearance of a lower activation energy;the extrapolation of its value at infinite dilution provides a result in good accordance with the expected binding energy of 1 V_ORE _(Ce) dimers,pointing at their stability even in the high temperature conduction regime.