Computational and experimental studies of optical absorption properties of perovskite-layered SrO(SrTiO3)n (n=1, 2,…, ∞)

Zhou, Nan; Chen, G.; Zhang, H.J.; Zhou, Chang

doi:10.1016/j.jallcom.2008.10.054

Cited by 9 publications

(3 citation statements)

References 13 publications

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“…The first peak of this spectrum at ∼418 cm −1 corresponds to bending mode (v b ) of bond angle and the strong absorption peak at ∼592 cm −1 arises from stretching mode (v s ) of Mn-O bond which involves the internal motion of a change in bond length in MnO 6 octahedral and the band at about 592 cm −1 can be caused by the Jahn-Teller effect [12,18,23,24]. In IR spectra of STO two absorption peaks have been observed at ∼600 cm −1 and ∼425 cm −1 correspond to the Ti-O stretching modes, similar type of result has been found by Zhou et al [25] also. IR spectra of composite samples contain the absorption peaks of both the phases and no other additional peak.…”

Section: Structural and Microscopic Analysissupporting

confidence: 70%

Studies on La0.67Ca0.33MnO3–SrTiO3 composites using two-phase model

Keshri

Joshi

Rajput

2011

Journal of Alloys and Compounds

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Section: Structural and Microscopic Analysissupporting

confidence: 70%

Studies on La0.67Ca0.33MnO3–SrTiO3 composites using two-phase model

Keshri

Joshi

Rajput

2011

Journal of Alloys and Compounds

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“…The main bands observed in the low-energy region of the spectrum are associated with vibrations of the TiO 6 octahedra in SrTiO 3 . 43,44 The peak at 450 cm −1 (E u phonon) and an intense band at 600 cm −1 (A 2u + E u phonon) evidence the formation of the tetragonal phase by rotation of the TiO 6 octahedra around the c axis in the compressively strained film, in good agreement with previously reported theoretical calculations 45 and strain-temperature phase diagrams derived from X-ray measurements of epitaxial SrTiO 3 . 46 All other bands observable in the spectrum can be assigned to a mixed Sr/Ti silicate with different degrees of polymerization and numbers of non-bridging oxygens per silicon (NBO/Si) in the anionic structural units, [SiO 4 ] 4− .…”

Section: Resultssupporting

confidence: 89%

Nucleation kinetics of SrTiO₃ 3D islands and nanorings on Si substrates

et al. 2014

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The nucleation of SrTiO3 three-dimensional (3D) islands and nanorings on Si substrates via a novel metalorganic decomposition (MOD) process has been investigated as a function of temperature and solution concentration of the SrTi(OC3H7)6 precursor. Quantitative analysis of island density and size distribution by atomic force microscopy (AFM) has revealed the existence of a nucleation regime at solution concentrations below 5 × 10(-3) M, in which the critical nucleus is a trimer and a coalescence regime at higher concentrations, dominated by growth of immobile clusters. Nanorings form preferentially under high supersaturation conditions and their size distribution is consistent with a dynamic coalescence. On the basis of recent theoretical models (Gill, 2012), we have proposed that the island-to-nanoring transition in the SrTiO3/Si system occurs above a critical size as a result of a competition between energetic and kinetic factors. The combination of high-resolution transmission electron microscopy (HRTEM) and attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) has shown that the monocrystalline SrTiO3 nanoclusters grow pseudomorphically on the Si substrate and exhibit a strain-induced tetragonal lattice distortion.

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“…(2) SrO(SrTiO 3 ) n structures have lower thermal conductivity than SrTiO 3 because of their enhanced phonon scattering at the SrO/ (SrTiO 3 ) n interfaces; (3) the electrical conductivity of SrO(SrTiO 3 ) n structures can be adjusted by heavy doping while retaining their structure [3,4]; (4) SrO(SrTiO 3 ) n phases have exhibited indirect optical band gaps at room temperature, thereby indicating their promising application as photocatalytic materials [5].…”

Section: Introductionmentioning

confidence: 99%