Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/16608
Title: Microwave dielectric properties of sol-gel derived BaTi4O 9 and Ba2Ti9O20:B2O 3 ceramics
Authors: Tang, XG
Liu, JZ
Kwok, KW 
Chan, HLW 
Keywords: Ba2Ti9O20
BaTi4O 9
Ceramics
Dielectric properties
Microwave materials
Issue Date: 2005
Publisher: Springer
Source: Journal of electroceramics, 2005, v. 14, no. 2, p. 119-122 How to cite?
Journal: Journal of electroceramics 
Abstract: BaTi4O9 and B2O3-doped Ba 2Ti9O20 ceramics powders have been prepared by a sol-gel route. The phase evolution, grain size and dielectric properties of the BaTi4O9 and Ba2Ti9O 20-based ceramics powders have been investigated. These results show that the BaTi4O9 and 5 wt% B2O 3-doped Ba2Ti9O20 ceramics powders calcined at 800°C for 2 h with the grain sizes of 30-80 and 50-200 nm, respectively. Monophase sample of BaTi4O9 with orthorhombic symmetry could be obtained after the BaTi4O9 precursor was calcined at 1200°C for 2 h, whereas, monophase sample of 5 wt% B2O3-doped Ba2Ti9O20 was obtained at 800°C for 2 h. The BaTi4O9 and Ba 2Ti9O20: 5 wt% B2O3 ceramics fabricated using the sol-gel powders were found to have microwave dielectric properties with ε r = 36.1, Q = 3220 at 5.31 GHz, and ε r = 34.5, Q = 2425 at 5.53 GHz, respectively. The effect of sintering temperatures on the microwave dielectric properties of the Ba 2Ti9O20: 5 wt% B2O3 ceramics was studied.
URI: http://hdl.handle.net/10397/16608
ISSN: 1385-3449
EISSN: 1573-8663
DOI: 10.1007/s10832-005-0873-7
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