4 November 2010 Time-domain terahertz transmission absorption of (Ca0.5+x Sr0.5-x)[(Al0.5Nb0.5)0.5Ti0.5]O3 complex perovskite
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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.
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Mingzhe Hu, Mingzhe Hu, Chunya Luo, Chunya Luo, Cunlin Zhang, Cunlin Zhang, Haoshuang Gu, Haoshuang Gu, } "Time-domain terahertz transmission absorption of (Ca0.5+x Sr0.5-x)[(Al0.5Nb0.5)0.5Ti0.5]O3 complex perovskite", Proc. SPIE 7854, Infrared, Millimeter Wave, and Terahertz Technologies, 785411 (4 November 2010); doi: 10.1117/12.870280; https://doi.org/10.1117/12.870280
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