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Time-domain terahertz transmission absorption of (Ca[sub]0.5+x[/sub] Sr[sub]0.5-x[/sub])[(Al[sub]0.5[/sub]Nb[sub]0.5[/sub])[sub]0.5[/sub]Ti[sub]0.5[/sub]]O[sub]3[/sub] complex perovskite
Author(s): Mingzhe Hu; Chunya Luo; Cunlin Zhang; Haoshuang Gu
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Paper Abstract

The phase assemblage and dielectric properties of (Ca0.5+x Sr0.5-x)[(Al0.5Nb0.5)0.5Ti0.5]O3O3 ceramics (abbreviated as CSANT hereafter) in Terahertz waveband were investigated. The CSANT complex perovskite was unstable at Ca2+-rich composition, a secondary phase were easily segregated in x ≥-0.05 region. The main perovskite phase CSANT crystallized in Fm3m cubic symmetry in the composition range of x≤-0.1, however, it transited to Pbnm orthorhombic space group after x=-0.1 due to the antiphase tilting of oxygen octahedra. As x further increased to x=0.2, or the tolerance factor decreased to 0.9785, A-site Ca2+/Sr 2+ cations antiparallel displacements also appeared. The dielectric absorption property of CSANT ceramics in THz frequency range was investigated using time-domain transmission spectrum technology and was correlated to their microstructures. The compositional dependence of the power absorption property of CSANT ceramics exhibited a monotonous variation in 0.1~2.5THz frequency. A lowest THz power absorption ceramic could be obtained in CSANT compounds at x=0.3 when sintered at 1500°C for 4hrs.

Paper Details

Date Published: 4 November 2010
PDF: 11 pages
Proc. SPIE 7854, Infrared, Millimeter Wave, and Terahertz Technologies, 785411 (4 November 2010); doi: 10.1117/12.870280
Show Author Affiliations
Mingzhe Hu, Hubei Univ. (China)
Chunya Luo, Hubei Univ. (China)
Cunlin Zhang, Capital Normal Univ. (China)
Haoshuang Gu, Hubei Univ. (China)

Published in SPIE Proceedings Vol. 7854:
Infrared, Millimeter Wave, and Terahertz Technologies
Cunlin Zhang; Xi-Cheng Zhang; Peter H. Siegel; Li He; Sheng-Cai Shi, Editor(s)

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