130217 20241125101151.0 doi 10.1016/j.jallcom.2023.170201 sideral 133639 ART-2023-133639 eng Madre, M. A. Universidad de Zaragoza (orcid)0000-0002-0794-3998 Effect of Y, La, and Yb simultaneous doping on the thermal conductivity and thermoelectric performances of CaMnO3 ceramics 2023 Access copy available to the general public Unrestricted Triple doping of CaMnO3 in different stoichiometric proportions has been studied in bulk sintered materials. They were prepared through the classical ceramic route using planetary milling to decrease the precursors particle sizes. It has been found that particle sizes decrease with the amount of dopant, both in the precursors and in the sintered bodies. XRD patterns showed that all samples were nearly single phase, with small amounts of CaMn2O4 phase. SEM and TEM observations revealed a homogeneous distribution of dopants in the CaMnO3 phase, while EDX showed a composition close to the nominal one. However, HREM imaging has shown some dark regions in the crystallites, with different Ca(Y,La,Yb)/Mn ratios found through STEM image-chemical mapping, which points out to the coexistence of CaMnO3 and CaMn2O4–type domains in the crystallites. Electrical resistivity, absolute Seebeck coefficient and thermal conductivity have been drastically decreased with doping. The highest PF values at 800 ºC have been achieved in 0.02(Y,La,Yb) doped samples (∼ 0.37 mW/K2m), which is among the best reported values in literature. On the other hand, lattice thermal conductivity is dramatically decreased with doping due to the phonon scattering produced by the dopants, the decrease in the grain sizes, and the strains present inside the crystallites, reaching the minimum values at 800 ºC in 0.03(Y,La,Yb) doped samples (∼ 0.8 W/K m). Consequently, ZT reaches the maximum values (∼ 0.29) in 0.03(Y,La,Yb) doped samples due to their very low thermal conductivity, being higher than the best ZT reported values in the literature. info:eu-repo/grantAgreement/ES/DGA/T54-20R info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 5.8 2023 MATERIALS SCIENCE, MULTIDISCIPLINARY 109 / 439 = 0.248 2023 Q1 T1 METALLURGY & METALLURGICAL ENGINEERING 8 / 90 = 0.089 2023 Q1 T1 CHEMISTRY, PHYSICAL 51 / 178 = 0.287 2023 Q2 T1 1.103 2023 Materials Chemistry 2023 Q1 Metals and Alloys 2023 Q1 Mechanics of Materials 2023 Q1 Mechanical Engineering 2023 Q1 11.1 2023 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Amaveda, H. Universidad de Zaragoza (orcid)0000-0003-2212-447X Dura, O. J. Pelloquin, D. Mora, M. Universidad de Zaragoza (orcid)0000-0003-4747-7327 Torres, M. A. Universidad de Zaragoza (orcid)0000-0003-3995-5763 Marinel, S. Sotelo, A. Universidad de Zaragoza (orcid)0000-0001-7056-0546 5002 305 Universidad de Zaragoza Dpto. Ingeniería Diseño Fabri. Área Expresión Gráfica en Ing. 5001 065 Universidad de Zaragoza Dpto. Ciencia Tecnol.Mater.Fl. Área Cienc.Mater. Ingen.Metal. 954 (2023), 170201 [9 pp.] J. alloys compd. JOURNAL OF ALLOYS AND COMPOUNDS 0925-8388 921923 http://zaguan.unizar.es/record/130217/files/texto_completo.pdf Postprint info:eu-repo/date/embargoEnd/2024-04-18 1373828 http://zaguan.unizar.es/record/130217/files/texto_completo.jpg?subformat=icon icon Postprint info:eu-repo/date/embargoEnd/2024-04-18 oai:zaguan.unizar.es:130217 articulos driver 2024-11-22-12:06:58 ARTICLE