Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 583, Issue -, Pages 141-144Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2013.08.106
Keywords
Ferromagnetic manganites; Nanostructure effects; Small polaron hopping; Thermoelectric properties
Categories
Funding
- Junta de Comunidades de Castilla-La Mancha [PCI08-0091-9017, PAI-05-013]
- Spanish CICYT [MAT2012-34655]
- Universidad de Castilla-La Mancha
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In this work we report on thermopower S(T) and electrical resistivity q(T) measurements performed on La1-xSrxMnO3(x = 0.2, 0.3) ceramic samples, obtained by cold compaction and sintering of mechanically alloyed nanocrystalline powders. The samples studied in this work display grain sizes between d similar to 70 nm and O(2 mu lm). The effects induced by the nanostructure on the thermoelectric and electrical properties in the paramagnetic state have been studied and discussed in terms of current theories about small polaron electrical transport in manganites. The observed changes in the conductivity and thermopower activation energies can be interpreted as a consequence of enhanced carrier localization and higher polaron formation energy WH for nanocrystalline La1-xSrxMnO3. (C) 2013 Elsevier B.V. All rights reserved.
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