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

Mingzhe Hu; Chunya Luo; Cunlin Zhang; Haoshuang Gu

doi:10.1117/12.870280

4 November 2010 Time-domain terahertz transmission absorption of (Ca_0.5+x Sr_0.5-x)[(Al_0.5Nb_0.5)_0.5Ti_0.5]O₃ complex perovskite

Mingzhe Hu, Chunya Luo, Cunlin Zhang, Haoshuang Gu

Author Affiliations +

Proceedings Volume 7854, Infrared, Millimeter Wave, and Terahertz Technologies; 785411 (2010) https://doi.org/10.1117/12.870280
Event: Photonics Asia 2010, 2010, Beijing, China

Abstract

The phase assemblage and dielectric properties of (Ca_0.5+x Sr_0.5-x)[(Al_0.5Nb_0.5)_0.5Ti_0.5]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, Chunya Luo, Cunlin Zhang, and Haoshuang Gu "Time-domain terahertz transmission absorption of (Ca_0.5+x Sr_0.5-x)[(Al_0.5Nb_0.5)_0.5Ti_0.5]O₃ complex perovskite", Proc. SPIE 7854, Infrared, Millimeter Wave, and Terahertz Technologies, 785411 (4 November 2010); https://doi.org/10.1117/12.870280

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KEYWORDS

Ceramics

Absorption

Terahertz radiation

Perovskite

Dielectrics

Tolerancing

Crystals

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