000117419 001__ 117419
000117419 005__ 20240319080956.0
000117419 0247_ $$2doi$$a10.1016/j.ceramint.2021.11.321
000117419 0248_ $$2sideral$$a127309
000117419 037__ $$aART-2022-127309
000117419 041__ $$aeng
000117419 100__ $$0(orcid)0000-0003-3995-5763$$aTorres M.A.$$uUniversidad de Zaragoza
000117419 245__ $$aEvaluation of pressure and temperature effect on the structure and properties of Ca2.93Sr0.07Co4O9 ceramic materials
000117419 260__ $$c2022
000117419 5060_ $$aAccess copy available to the general public$$fUnrestricted
000117419 5203_ $$aIn this work, the effect of hot-pressing conditions on the performances of Sr-doped Ca3Co4O9 materials has been investigated. The samples were prepared from attrition milled precursors, which reduced the processing time. Samples were hot-pressed at temperatures (T) between 800 and 900 °C and pressures (P) from 51 to 71 MPa. The out-of-plane X-ray diffraction (XRD) showed that all samples are formed by the thermoelectric phase, with a good grain orientation which is improved with T, and P, as demonstrated by their Lotgering factor. The observations through Scanning Electron Microscopy (SEM) have revealed that grain sizes and orientation are enhanced with T, and P, as well as density through Archimedes''s method. All these trends are reflected in the flexural strength and microhardness. The electrical resistivity is lower when the T, or P, is increased, reaching 6.4 mO cm for samples processed at 900 °C and 71 MPa, which is about the best reported values in the literature. On the other hand, contrarily to the expected results, they also showed the highest S values, 182 µV/K, which are similar to the best reported values for highly dense textured materials. Thermal conductivity values do not follow a regular evolution with the hot-pressing conditions, probably due to internal stresses, reaching the lowest values at 800 °C in samples processed at 800 °C and 51 MPa (1.51 W/(K*m)) or 900 °C and 61 MPa (1.53 W/(K*m)). Consequently, the highest ZT values have been determined in samples processed at 900 °C and 61 MPa (0.35) which is higher than the best reported values in literature for bulk textured samples, to the best of our knowledge. © 2021 The Authors
000117419 536__ $$9info:eu-repo/grantAgreement/ES/DGA/T54-20R$$9info:eu-repo/grantAgreement/ES/MINECO-FEDER/MAT2017-82183-C3-1-R
000117419 540__ $$9info:eu-repo/semantics/openAccess$$aby-nc-nd$$uhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
000117419 590__ $$a5.2$$b2022
000117419 592__ $$a0.918$$b2022
000117419 591__ $$aMATERIALS SCIENCE, CERAMICS$$b3 / 29 = 0.103$$c2022$$dQ1$$eT1
000117419 593__ $$aCeramics and Composites$$c2022$$dQ1
000117419 593__ $$aElectronic, Optical and Magnetic Materials$$c2022$$dQ1
000117419 593__ $$aSurfaces, Coatings and Films$$c2022$$dQ1
000117419 593__ $$aMaterials Chemistry$$c2022$$dQ1
000117419 593__ $$aProcess Chemistry and Technology$$c2022$$dQ2
000117419 594__ $$a8.8$$b2022
000117419 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000117419 700__ $$0(orcid)0000-0002-0794-3998$$aMadre M.A.$$uUniversidad de Zaragoza
000117419 700__ $$aDura O.J.
000117419 700__ $$aGarcía G.
000117419 700__ $$aMarinel S.
000117419 700__ $$aMartinez-Filgueira P.
000117419 700__ $$aSotelo A.
000117419 7102_ $$15002$$2305$$aUniversidad de Zaragoza$$bDpto. Ingeniería Diseño Fabri.$$cÁrea Expresión Gráfica en Ing.
000117419 7102_ $$15001$$2065$$aUniversidad de Zaragoza$$bDpto. Ciencia Tecnol.Mater.Fl.$$cÁrea Cienc.Mater. Ingen.Metal.
000117419 773__ $$g48, 6 (2022), 7730-7747$$pCeram. int.$$tCeramics International$$x0272-8842
000117419 8564_ $$s19145204$$uhttps://zaguan.unizar.es/record/117419/files/texto_completo.pdf$$yVersión publicada
000117419 8564_ $$s2320677$$uhttps://zaguan.unizar.es/record/117419/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000117419 909CO $$ooai:zaguan.unizar.es:117419$$particulos$$pdriver
000117419 951__ $$a2024-03-18-13:36:00
000117419 980__ $$aARTICLE