Lattice dynamics and dielectric response of Mg-doped SrTiO3 ceramics in a wide frequency range
作者： A. Tkach , P. M. Vilarinho , A. L. Kholkin , A. Pashkin , P. Samoukhina
DOI: 10.1063/1.1849822
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摘要: Atomic substitutions in the SrTiO3 (ST) perovskite lattice are foreseen to modify vibration modes, which apparently sensitive site at substitution occurs. In order understand effect of Mg ST lattice, dielectric properties Sr1−xMgxTiO3 and SrTi1−yMgyO3−δ ceramics were investigated radio frequency (rf), microwave, terahertz (THz), infrared (IR) ranges. Micro-Raman spectroscopy rf tunability measurements also conducted on these samples. The micro-Raman spectra high-frequency Sr1−xMgxTiO3, including tunability, do not differ considerably from undoped SrTiO3, confirming only slight (if any) incorporation into Sr lattice. At same time, Ti-site doping results significant stiffening soft mode observed IR reflectivity spectra. Dielectric permittivity losses decrease both THz ranges accompanied by...
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