doi:10.1016/j.bsecv.2015.02.004engConstantinescu , GabrielRasekh Modabberi, Shahed VazehTorres Portero, Miguel ÁngelBosque Obon, PabloMadre Sediles, María Antonieta Eugenia De A.Sotelo Mieg, Andrés EmilioDíez Moñux, Juan CarlosThermoelectric doping effect in Ca3Co4-xNixO9 ceramicsART-2015-92743Ca3Co4-xNixO9 (x=0.01, 0.03, and 0.05) polycrystalline thermoelectric ceramics have been prepared by the classical solid state method. As a result of the Ni addition an increase in porosity has been detected. Moreover, the presence of Ni has been related with the increase of Ca2Co3O6 secondary phase and the appearance of a new NiO-CoO solid solution. However, for the 0.01-Ni doped samples an improvement in the thermoelectric performances has been measured. This effect has been related with a decrease in the resistivity values and an increase in the Seebeck coefficient. The raise in the power factor for the 0.01-Ni doped samples, compared with the undoped ones, is between 10 and 25% at 50 and 800 °C respectively. Moreover, the maximum power at 800 °C, around 0.25 mW/K2.m, is significantly higher than the best results obtained in Ni doped samples reported previously in the literature.2015http://zaguan.unizar.es/record/5626310.1016/j.bsecv.2015.02.004http://zaguan.unizar.es/record/56263oai:zaguan.unizar.es:56263info:eu-repo/grantAgreement/ES/DGA/T12info:eu-repo/grantAgreement/ES/DGA/T87info:eu-repo/grantAgreement/ES/MINECO/MAT2013-46505-C3-1-RBOLETIN DE LA SOCIEDAD ESPANOLA DE CERAMICA Y VIDRIO 54, 1 (2015), 21-27by-nc-ndhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccess