Raman ScatteringFerroelectric Phase TransitionSrtio 3Isotope SubstitutionSoft ModeRaman spectra in SrTiO 3 single crystals were measured. In the ferroelectric phase below T c = 24 K in SrTi 18 O 3, two modes were observed to soften on heating towards T c = 24 K. These modes are assigned ...
Very recently, the lattice dynamics1 and the Raman spectra of SrO have been successfully explained on the basis of a nonlinear shell model. It is shown that a modified version of this model theory can be applied to the case of SrTiO3. The importance of the polarizability of the oxygen ion...
圉3不同La:O3添加量试{荦的Raman光谱 Fig.3Ramanspectraofsamp~swithdiffe~ entLa2Oaaddltions(inmolfraction) 当La2Oa添加量较小时,发生下列反应 0' 0 0' 13 Sinteringtemperoture.c 圉2施主添加量不同时饶结温度对SrTiO陶 瓷半导化的影响 Fig.2InfluenceofsinteringtemperatureOil thesemiconductingofSrTiO3cer...
It is the deformed layer because of the absence of peak splitting in the XRD spectra. Without affecting the general time dependence, we tentatively define 2θ + Δ as the peak posi- tion for deformed layer, where 2θ is the 002 peak position of unstrained STO and Δ is ...
摘要 Pr-doped SrTiO3 films were prepared by metal organic deposition method on quartz substrates andrntheir optical properties were studied. The Raman spectra show that there are polar nanoregions in Pr-doped STOrnsamples. In addition, the optical transmittance spectra re...
The polar TOsoft mode in the IR spectra is strongly stiffened by Bi doping and its softening on cooling is gradually stopped. Increasing degree of local polar distortion induced by doping was detected by progressive activation of TOand TOpolar modes in the Raman spectra. Wide range (101.8×10...
TiO2/SrTiO3异质结纳米管薄膜的制备及光 电化学性能研究 Study on Preparation and Photoelectrochemical Performance of TiO2/SrTiO3 Heterojunction Nanotube Arrays 领域：环境工程 作者姓名：胡文丽 指导教师：谭欣教授 企业导师：张曙光高级工程师 天津大学环境科学与工程学院 二零一四年十二月 ...
Within the range of 2800–3800 cm−1 in Raman spectra, peaks are derived from O-H vibrations. To be precise, the peak in the high-frequency region around 3550 cm−1 is the low energy O-H in H2O, that is, the weak hydrogen bond. The peak in the low-frequency region of 3253 ...
Weaker stiffening of this mode observed in the Raman spectra is explained by the higher phonon wavevector active in the Raman response and by a different geometry of its propagation. Raman data also confirmed a smaller tetragonality below the structural phase transition as compared to single ...
Raman scattering spectra from soft phonon branches in SrTiO3 were observed for the case that the ferroelectric transition was actuated by either applying the (100> uniaxial mechanical stress or adding small amounts of Ba ion. Variations of phonon frequencies of the ferroelectric soft mode were ...