Enhanced Thermoelectric Properties of Misfit Bi(2)Sr(2-x)Ca(x)Co(2)O(y): Isovalent Substitutions and Selective Phonon Scattering

Layered Bi-misfit cobaltates, such as Bi(2)Sr(2)Co(2)O(y), are the natural superlattice of an electrically insulating rocksalt (RS) type Bi(2)Sr(2)O(4) layer and electrically conducting CoO(2) layer, stacked along the crystallographic c-axis. RS and CoO(2) layers are related through charge compensat...

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Detalles Bibliográficos
Autores principales: Chatterjee, Arindom, Banik, Ananya, El Sachat, Alexandros, Caicedo Roque, José Manuel, Padilla-Pantoja, Jessica, Sotomayor Torres, Clivia M., Biswas, Kanishka, Santiso, José, Chavez-Angel, Emigdio
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9959144/
https://www.ncbi.nlm.nih.gov/pubmed/36837043
http://dx.doi.org/10.3390/ma16041413
Descripción
Sumario:Layered Bi-misfit cobaltates, such as Bi(2)Sr(2)Co(2)O(y), are the natural superlattice of an electrically insulating rocksalt (RS) type Bi(2)Sr(2)O(4) layer and electrically conducting CoO(2) layer, stacked along the crystallographic c-axis. RS and CoO(2) layers are related through charge compensation reactions (or charge transfer). Therefore, thermoelectric transport properties are affected when doping or substitution is carried out in the RS layer. In this work, we have shown improved thermoelectric properties of spark plasma sintered Bi(2)Sr(2-x)Ca(x)Co(2)O(y) alloys (x = 0, 0.3 and 0.5). The substitution of Ca atoms affects the thermal properties by introducing point-defect phonon scattering, while the electronic conductivity and thermopower remain unaltered.

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