Multifunctional ceramics Ba1−xSrx(Ti1−xLix)O3−3xF3x

Autor:	Meriem Meyar, Laldja Taïbi-Benziada
Rok vydání:	2007
Předmět:	Materials science Scanning electron microscope Analytical chemistry Sintering Mineralogy Dielectric Ferroelectricity Differential scanning calorimetry visual_art Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Curie temperature Ceramic Solid solution
Zdroj:	Journal of the European Ceramic Society. 27:1097-1100
ISSN:	0955-2219
Popis:	Mixtures of (1-x)BaTiO 3 +xSrF2 +xLiF are prepared and dry-ground. The powders thus obtained are shaped to discs and sintered in free-air at 950 °C for 2 h. The shrinkage coefficient varies between 14.5% and 16.8%. The XRD patterns show the formation of a new solid solution with general formula Ba 1-x Sr x (Ti 1-x Li x )O 3-3x F 3x which occurs in the composition range 0 ≤ x ≤ 0.25. The ceramic grain size is observed by Scanning Electron Microscopy (SEM) on fractured samples. The phase transitions in these perovskite-type oxifluorides are investigated by Differential Scanning Calorimetry (DSC) and dielectric measurements. The sintering temperature (t sint ≈ 1400°C) and the ferroelectric Curie temperature (T C ≈ 120 °C) of BaTiO 3 are strongly lowered by the triple substitution Ba-Sr, Ti-Li and O-F. The value of T C for Ba 0.95 Sr 0.05 (Ti 0.95 Li 0.05 )O 2.85 F 0.15 is around -65 °C. These new phases are suitable for the fabrication of capacitors in various microelectronic devices.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::48273fac64a26eb2e923a2d2ac2872b3 https://doi.org/10.1016/j.jeurceramsoc.2006.05.035 Zobrazit plný text záznamu Full Text from ScienceDirect