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Structure and microwave dielectric properties of BaLa4Ti4O15
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Zheng, H., Woodward, David I., Gillie, L. and Reaney, Ian M. (2006) Structure and microwave dielectric properties of BaLa4Ti4O15. Journal of Physics: Condensed Matter, 18 (31). pp. 7051-7062. doi:10.1088/0953-8984/18/31/001 ISSN 0953-8984.
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Official URL: http://dx.doi.org/10.1088/0953-8984/18/31/001
Abstract
BaLa4Ti4O15 (BLT) is a compound with a Ti-deficient, layered perovskite-related structure. Dense BLT ceramics have been produced and their crystal structures and microstructures are investigated. The average macroscopic structure of BLT powder is considered to be hexagonal with space group , but there is some evidence in high-order x-ray diffraction peaks of asymmetry. Energy-dispersive x-ray analysis and Raman spectroscopy have illustrated that there is a heterogeneous distribution of constituent cations which may induce asymmetry as a result of the presence of two hexagonal phases of slightly different lattice parameter. Despite this inhomogeneity, BLT exhibits a microwave quality factor (Qf) of ~44 000 GHz, a relative permittivity (εr) of ~45, and a temperature coefficient of resonant frequency (τf) of −2 ppm °C−1. In addition, anisotropy in the properties of the ceramic has been observed, with εr found to be larger when measured normal to the pressing direction.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics Q Science > QD Chemistry T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Library of Congress Subject Headings (LCSH): | Condensed matter, Dielectrics, Electronic ceramics, Microwave measurements | ||||
Journal or Publication Title: | Journal of Physics: Condensed Matter | ||||
Publisher: | Institute of Physics Publishing Ltd. | ||||
ISSN: | 0953-8984 | ||||
Official Date: | 21 July 2006 | ||||
Dates: |
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Volume: | 18 | ||||
Number: | 31 | ||||
Page Range: | pp. 7051-7062 | ||||
DOI: | 10.1088/0953-8984/18/31/001 | ||||
Status: | Peer Reviewed | ||||
Access rights to Published version: | Restricted or Subscription Access |
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