Enhancing the thermoelectric performance of cold sintered calcium cobaltite ceramics through optimised heat-treatment
Year: 2022
Type: article
Abstract: Cold sintering is a promising technology for preparing electronic materials, enabling densification at low temperature, but rarely employed for thermoelectrics. Herein, high-quality Ca2.7Bi0.3Co3.92O9+δ ceramics were synthesised by a combination of cold sintering and annealing processes. Stoichiometric mixtures of raw materials were calcined once or twice at 1203 K for 12 h in air, and then cold sintered at 673 K for 60 min under a pressure of 85 MPa, followed by annealing at 1203 K for 12 h or 24 h in air. The effects of the calcination processes and annealing conditions on the thermoelectric performance of cold sintered samples were investigated. By optimising heat-treatment, the formation of secondary phases, texture development and porosity were controlled, leading to enhanced electrical conductivity and reduced thermal conductivity. Consequently, at 800 K there was 85% increase in power factor and 35% increase in ZT (value of 0.15) compared to previous studies.
Institutions: University of Manchester, University of Oulu
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,610
Awards: G1015058392, Printed Electroceramics with Ultimate Compositions, G2703599441, G3236045249, G3305536412, G3609573722, MAnufacture of Safe and Sustainable Volatile Element functional materials - MASSIVE Materials, Thermoelectrics Network -TEMPEST (ThermoElectric Materials, Physics, Electronics & SysTems), Sir Henry Royce Institute - Manchester and NNL Equipment, G4630886971, G504327055, Correlative Mapping of Crystal Orientation and Chemistry at the Nanoscale, G5424142534, Sir Henry Royce Institute - Manchester Build, G5981071659, Nanostructured Thermoelectric Oxides for Energy Generation: A Combined Experimental and Modelling Investigation, G6544254002, The Royce: Capitalising on the investment, G708391930, G7445816383, G748192457, G7514479249, Sir Henry Royce InsStitute - recurrent grant, G8640038281, G87373762
OpenAlex ID: W4220763019