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木村 耕治*; 筒井 智嗣*; 山本 裕太*; 中埜 彰俊*; 川村 啓介*; 梶本 亮一; 蒲沢 和也*; Martin, A.*; Webber, K. G.*; 柿本 健一*; et al.
Physical Review B, 110(13), p.134314_1 - 134314_10, 2024/10
被引用回数:0 パーセンタイル:0.00(Materials Science, Multidisciplinary)We performed inelastic X-ray and neutron scattering (IXS and INS) experiments for (Ba,Ca)TiO single crystals to elucidate the effect of Ca doing on the atomic dynamics. Dispersion relations of transverse phonons in BaTiO
, (Ba
Ca
)TiO
, and (Ba
Ca
)TiO
were determined. The
-site-O vibrational mode as well as the acoustic mode were observed both by IXS and INS, whereas the Ti-O soft mode was detected only by INS. It was found that the
-site-O vibration exhibits significant softening with increasing Ca concentration, while the Ti-O soft mode is almost unaffected by the Ca doping. This finding is discussed in comparison with the polarization hysteresis loops and piezoelectric coefficients of (Ba,Ca)TiO
. It is indicated that the softening of the
-site-O vibration contributes to the enhancement of the piezoelectricity of Ca-doped BaTiO
-based materials.