NDLI: SOLUȚII SOLIDE La1-xSrxCoO3-δ CU STRUCTURĂ PEROVSKIT (x = 0,4 și 0,5) La1-xSrxCoO3-δ SOLID SOLUTIONS WITH A PEROVSKITE STRUCTURE (x = 0.4 and 0.5)

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SOLUȚII SOLIDE La1-xSrxCoO3-δ CU STRUCTURĂ PEROVSKIT (x = 0,4 și 0,5) La1-xSrxCoO3-δ SOLID SOLUTIONS WITH A PEROVSKITE STRUCTURE (x = 0.4 and 0.5)

Content Provider	Semantic Scholar
Author	Velciu, Georgeta Melinescu, Alina Marinescu, Virgil Emanuel Fruth, Victor Hornoiu, Cristian Preda, Maria Alexandra
Copyright Year	2019
Abstract	Two types of La0,6Sr0,4Co3-δ and La0,5Sr0,5Co3-δ compositions were studied. The preparation of mixtures from La2O3, SrCoO3 and Co3O4 was made by mechanical activation. The obtained powders have a monomodal distribution of particle sizes and low dispersion. Reactions occurring in the formation of compounds in these mixtures were studied by complex thermal analysis. The two compositions have been sintered at a temperature of 1250C. The mineralogical composition determined on thermally treated samples showed that in case La0,6Sr0,4Co3-δ compound a solid solution was formed with the cubic structure derived from LaCoO3, and for La0,5Sr0,5Co3-δ a solid solution with a hexagonal structure corresponding to SrCoO3. The samples formed single-phase at 1250C. The electrical conductivity measurements showed a semiconductor behavior for La0,6Sr0,4Co3-δ, and conductor behavior for La0,5Sr0,5Co3-δ. Au fost studiate două tipuri de compoziții La0.6Sr0.4Co3-δ și La0.5Sr0.5Co3-δ. Prepararea amestecurilor din La2O3, SrCoO3 și Co3O4 a fost făcută prin activare mecanică. Pulberile obținute au o distribuție monomodală a dimensiunilor particulelor și dispersie redusă. Reacțiile care au apărut la formarea compușilor din aceste amestecuri au fost studiate prin analize termice complexe. Cele două compoziții au fost sinterizate la o temperatură de 1250°C. Compoziția mineralogică determinată pe eșantioanele tratate termic a arătat că în cazul compusului La0.6Sr0.4Co3-δ s-a format o soluție solidă cu structura cubică derivată din LaCoO3 și pentru La0.5Sr0.5Co3-δ o soluție solidă cu o structură hexagonală corespunzătoare la SrCoO3. Probele au format o singură fază la 1250°C. Măsurătorile de conductivitate electrică au arătat un comportament semiconductor pentru La0.6Sr0.4Co3-δ, și comportament tip conductor pentru La0.5Sr0.5Co3-δ.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://solacolu.chim.upb.ro/p173-178.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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