Structure-microwave property relations of Ca and Sr titanates

Autor:	Ian M. Reaney, D. Iddles, William E. Lee, D.S. Cannell, P. L. Wise, T. Price
Rok vydání:	2001
Předmět:	Permittivity Materials science Mineralogy Dielectric Crystallography Calcium titanate chemistry.chemical_compound chemistry Octahedron Transmission electron microscopy Materials Chemistry Ceramics and Composites Temperature coefficient Microwave Solid solution
Zdroj:	Journal of the European Ceramic Society. 21:2629-2632
ISSN:	0955-2219
Popis:	The microwave dielectric properties of the Sr x Ca 1− x TiO 3 , Sr n +1 Ti n O 3 n +1 and (Sr x Ca 1− x ) 3 Ti 2 O 7 series have been measured. TCF decreases from +1647 to +859 MK −1 as Ca content increases in the Sr x Ca 1− x TiO 3 series, due to the onset of octahedral tilt transitions. Additions of excess SrO to SrTiO 3 form the Sr n +1 Ti n O 3 n +1 series with Q a maximum for Sr 3 Ti 2 O 7 . Ca substitutions to Sr 3 Ti 2 O 7 result in a solid solution limited to the Sr and Ca rich ends of the (Sr x Ca 1− x ) 3 Ti 2 O 7 series with Q a maximum of 10 250 at 2.5 GHz for Sr 2.4 Ca 0.6 Ti 2 O 7 and TCF a minimum + 50 MK −1 for Ca 3 Ti 2 O 7 . The variation of TCF for the (Sr x Ca 1− x ) 3 Ti 2 O 7 series was also attributed to the onset of octahedral tilt transitions.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1df1a9f87ef049206e501042bc086f66 https://doi.org/10.1016/s0955-2219(01)00328-4 Zobrazit plný text záznamu Full Text from ScienceDirect