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Correlation between Sn substitution for Ti and Microwave Dielectric Properties of Magnesium Titanate Ceramics
Author(s) -
Yu Hongtao,
Xue Xiaomei,
Xu Guangliang
Publication year - 2013
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.12107
Subject(s) - materials science , dielectric , ceramic , ilmenite , phase (matter) , microwave , analytical chemistry (journal) , temperature coefficient , sintering , magnesium , titanate , calcium titanate , mineralogy , metallurgy , composite material , chemistry , chromatography , organic chemistry , optoelectronics , quantum mechanics , physics
The relationship between Sn substitution for Ti and microwave dielectric properties of Mg(Ti 1‐ x Sn x )O 3 ceramics was investigated. Sn 4+ could substitute for Ti 4+ in MgTiO 3 and increase the crystal volume. All samples exhibited the MgTiO 3 ‐type phase with ilmenite structure as main phase. At the x range from 0 to 0.05, the secondary phase of Mg 2 TiO 5 was observed. Upon further increasing Sn content up to 0.15, the SnO 2 phase appeared. When the x value increased from 0 to 0.05, the dielectric constant decreased slightly and the quality factor increased sharply, whereas the dielectric constant increased and the quality factor decreased as the x value varied from 0.05 to 0.15. The temperature coefficient of resonant frequency moved toward positive value with Sn substitution. In particular, at the x range from 0.05 to 0.07, the ceramic sintered at 1360°C for 4 h exhibited excellent microwave dielectric properties of ε r = 16.8–17.1, Q f = 298,000–312,000 and τ f = −53~−50 ppm/°C.