Sensing properties of barium titanate nanoceramics tailored by doping and microstructure control

Autor:	Biljana Stojanović, Nikola Ilic, Aleksandar Radojković, M.M. Vijatović Petrović, J.D. Bobić, A.S. Dzunuzovic
Rok vydání:	2019
Předmět:	Materials science Dopant Mechanical Engineering Doping Sintering Microstructure Ferroelectricity Grain size chemistry.chemical_compound chemistry Mechanics of Materials visual_art Barium titanate visual_art.visual_art_medium General Materials Science Ceramic Composite material
Zdroj:	Journal of Materials Science. 54:6038-6052
ISSN:	1573-4803 0022-2461
DOI:	10.1007/s10853-018-03308-4
Popis:	BaTiO3 nanopowders doped with La and co-doped with La/Mn were prepared by auto-combustion and Pechini methods, respectively. The influence of the synthesis methods, dopants and sintering temperature on the BaTiO3 structure and its potential to be used as humidity and/or H2 gas sensor were studied. The optimization of all process parameters was performed to obtain adequate microstructure for the development of good sensor properties. The difference in the grain size between the La-doped and La/Mn co-doped samples and the formation of different types of defect structures in these ceramics were found to be significant for the desired electrical and ferroelectric properties. The La-doped ceramics with a pseudo-cubic structure showed the highest potential for gas sensors. The materials obtained by the Pechini method had a tetragonal structure and showed the best response, i.e., the change in electrical resistivity by four orders of magnitude in the humid atmosphere.
Databáze:	OpenAIRE
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