Enhanced Thermoelectric Properties of Misfit Bi2Sr2-xCaxCo2Oy: Isovalent Substitutions and Selective Phonon Scattering

Author:

Chatterjee Arindom1,Banik Ananya2,El Sachat Alexandros1ORCID,Caicedo Roque José Manuel1,Padilla-Pantoja Jessica1ORCID,Sotomayor Torres Clivia M.13ORCID,Biswas Kanishka2,Santiso José1,Chavez-Angel Emigdio1ORCID

Affiliation:

1. Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus Universitat Autonoma de Barcelona (UAB), Bellaterra, 08193 Barcelona, Spain

2. New Chemistry Unit, School of Advanced Materials, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bangalore 06484, India

3. ICREA—Catalan Institute for Research and Advanced Studies, 08010 Barcelona, Spain

Abstract

Layered Bi-misfit cobaltates, such as Bi2Sr2Co2Oy, are the natural superlattice of an electrically insulating rocksalt (RS) type Bi2Sr2O4 layer and electrically conducting CoO2 layer, stacked along the crystallographic c-axis. RS and CoO2 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 Bi2Sr2-xCaxCo2Oy 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.

Funder

Ministry of Economy, Industry and Competitiveness

EU-H2020

the AGAUR agency

CNRS-CSIC

Publisher

MDPI AG

Subject

General Materials Science

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