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On synthesis, phase purity, and oxygen stoichiometry of sodium and calcium cobaltate thermoelectrics

Abstract

Relatively high concentrations of oxygen vacancies and effects on thermoelectric properties have been reported in the literature on state-of-the-art thermoelectric sodium cobaltates. However, first principle calculations suggest high energies and low concentrations of such vacancies. Experiments in our laboratory indicate that apparent oxygen non-stoichiometry may have stemmed from secondary phases present after decomposition in two-phase regions during synthesis and measurements. In a similar manner, experimental evaluation and defect-chemical interpretation of non-stoichiometry in calcium cobaltate thermoelectrics are troubled by non-trivial synthesis and sample fabrication. Recent results on these matters are presented and discussed.

Category

Academic lecture

Client

  • Research Council of Norway (RCN) / 200022

Language

English

Author(s)

Affiliation

  • University of Oslo
  • SINTEF Industry / Sustainable Energy Technology
  • Unknown

Presented at

37th International Conference & Exposition on Advanced Ceramics and Composites

Place

Daytona Beach, Florida

Date

27.01.2013 - 01.02.2013

Organizer

The American Ceramic Society

Year

2013

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