Vibrational spectroscopy study of the lattice defects in CaZrO3 ceramics
Vibrational spectroscopy study of the lattice defects in CaZrO3 ceramics
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DOI：
10.1016/s0955-2219(03)00512-0
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发表时间：
2004-01-01
影响因子：
5.7
通讯作者：
Marinel, S
中科院分区：
文献类型：
--
作者：
Pollet, M;Daturi, M;Marinel, S
采用固相反应法制备了CaZrO 3材料。将样品预煅烧并在1673 K下烧结6 h。然后使用傅里叶变换红外光谱法对其进行分析。通过Kramers-Kronig分析测定微波介电函数（ε = ε ′ + ε ″）。然后使用考虑LO/TO（纵向/横向光学）模式分裂的经典色散方程来调整反射光谱。就耗散而言，发现最不利的模式是第一种模式（Ω（T）= 106.9 cm（-1））。一个简单的调整，然后进行这种模式的横向光学阻尼常数-以适应轻微的非化学计量的CaZrO 3材料的反射光谱。除了过量的Zr非化学计量（外推至> 2.78%）之外，该程序是决定性的。(C)2003爱思唯尔有限公司。保留所有权利。
CaZrO3 materials were prepared by a solid state reaction. The samples were pre-calcined and sintered at 1673 K for 6 h. They were then analysed using Fourier Transform-Infrared spectroscopy. Microwave dielectric function (epsilon = epsilon'+ iepsilon") were determined by Kramers-Kronig analysis. The reflectance spectra were then adjusted using the classical dispersion equations taking into account the LO/TO (longitudinal/transverse optic) mode splitting. The most unfavourable mode in terms of dissipation was found to be the first one (omega(T) = 106.9 cm(-1)). A simple adjustment of this mode transverse optic damping constant was then carried out - to fit the reflectance spectra of slightly non-stoichiometric CaZrO3 materials. This procedure was conclusive except for excessive Zr non-stoichiometry (extrapolated to > 2.78%). (C) 2003 Elsevier Ltd. All rights reserved.