Sintering of strontium titanate in the presence of lithium salts in a reducing atmosphere

Autor:	J. Lostec, G. Desgardin, B. Raveau, M. J. Laurent, J. M. Haussonne
Rok vydání:	1988
Předmět:	Materials science Mechanical Engineering Reducing atmosphere Inorganic chemistry Sintering chemistry.chemical_element Dielectric Bismuth chemistry.chemical_compound chemistry Mechanics of Materials Strontium titanate General Materials Science Lithium Electroceramics Perovskite (structure)
Zdroj:	Journal of Materials Science. 23:4481-4486
ISSN:	1573-4803 0022-2461
DOI:	10.1007/bf00551948
Popis:	The possibility of preparing Type III ceramics for multilayer applications has been investigated in the strontium-titanium-oxygen system, using La2O3, Nd2O3and “La2/3TiO3−ɛ” as dopants and lithium salts as sintering agents. The introduction of bismuth was also explored. The sintering process is carried out by adding the lithium salts to mixtures of strontium titanate and dopants which are previously calcined in a reducing atmosphere. The dielectric properties and the microstructure of the ceramics have been studied. The best characteristics have been observed for the particular nominal composition SrTiO3+0.75 mol% La2/3Ti3−ɛ+3 mol% Bi2O3+10 mol % LiNO3leading to ɛ=20000, tanδ < 2%,R i= 1011 Ωcm. These results are interpreted in terms of the formation of anionic vacancies and defects in the A sites of the perovskite ABO3and of extended defects “SrO” and “Bi2O 2 2+ which are coherent with the perovskite matrix.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::58bda9ed78da2067af9b9345e11a00ed https://doi.org/10.1007/bf00551948 Zobrazit plný text záznamu Full text from SpringerLink