Metal-like electrical conductivity in LaSrTiMoO oxides for high temperature thermoelectric power generation
Dalton Transactions, ISSN: 1477-9234, Vol: 46, Issue: 18, Page: 5872-5879
2017
- 16Citations
- 14Captures
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Metrics Details
- Citations16
- Citation Indexes16
- 16
- CrossRef14
- Captures14
- Readers14
- 14
Article Description
Increasing electrical conductivity in oxides, which are inherently insulators, can be a potential route in developing oxide-based thermoelectric power generators with higher energy conversion efficiency. In the present work, environmentally friendly non-toxic double perovskite LaSrTiMoO (LSTM) ceramics were synthesized using a solid-state reaction route by optimizing the sintering temperature and atmosphere for high temperature thermoelectric applications. Rietveld refinement of XRD data confirmed a single-phase solid solution with a cubic structure in these double perovskites with the space-group Pm3m. SEM studies showed a highly dense microstructure in these ceramics. High electrical conductivity on the order of 10 S m and large carrier concentration (∼10 cm) were obtained in these materials. The temperature-dependent electrical conductivity measurement showed that the LSTM ceramics exhibit a semiconductor to metal transition. Thermopower (S) measurements demonstrated the conductivity switching from a p-type to n-type behavior at higher temperature. A temperature dependent Seebeck coefficient was further explained using a model for coexistence of both types of charge carriers in these oxides. A conductivity mechanism of these double perovskites was found to be governed by a small polaron hopping model.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85021748732&origin=inward; http://dx.doi.org/10.1039/c7dt00848a; http://www.ncbi.nlm.nih.gov/pubmed/28401972; https://xlink.rsc.org/?DOI=C7DT00848A; http://xlink.rsc.org/?DOI=C7DT00848A; http://pubs.rsc.org/en/content/articlepdf/2017/DT/C7DT00848A; https://dx.doi.org/10.1039/c7dt00848a; https://pubs.rsc.org/en/content/articlelanding/2017/dt/c7dt00848a
Royal Society of Chemistry (RSC)
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