Lattice vibrational characteristics and dielectric properties of pure phase CaTiO3 ceramic

Shi, Feng; Fu, Guangen; Xiao, En-Cai; Li, Jianzhu

doi:10.1007/s10854-020-04357-9

Cited by 17 publications

(11 citation statements)

References 24 publications

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“…So far, 24 Raman active modes have been reported to exist in the orthorhombicstructured (Pnma) CaTiO 3 . 37,38 However, due to a low intensity or the overlapping of some of the modes or even the possibility of their low changes in polarizability to prevent the modes from being seen in the spectrum, we can identify only eight Ramanactive modes (Fig. 6a), which is in good agreement with earlier reports.…”

Section: Resultssupporting

confidence: 92%

“…Pertinent to mention, the shift in Raman peak position to lower frequencies (red-shift) is exactly what is observed for materials that are subjected to tensile stress, which causes the increase in interatomic separation and hence chemical bond lengths. 37,38 Therefore, the aforementioned values of red-shift in the Raman peaks reveals that the light-triggered non-thermal (Fig. S7, ESI †) amplified polyhedral distortions and the stretching of bond lengths generate the tensile strain observed in Fig.…”

Section: Resultsmentioning

confidence: 92%

“…6a), which is in good agreement with earlier reports. [37][38][39] Each of the peaks corresponds to different possible vibrational modes. Starting from the mode positioned at a lower wavenumber, the peak at 152 cm À1 corresponds to the inverted translational vibration between Ca 2+ and TiO 3 2À .…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Photostriction in CaTiO₃ ceramics under the illumination of a light emitting diode

Boda,

Chen,

et al. 2024

J. Mater. Chem. C

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 92%

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Photostriction in CaTiO₃ ceramics under the illumination of a light emitting diode

Boda,

Chen,

et al. 2024

J. Mater. Chem. C

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“…Different thermally treated methods to minimize the dielectric loss for CaTiO 3 were proposed by Hu et al [393]. The dielectric constant values saturated at 7. investigations about optimizing the properties of CaTiO 3 ceramics have been reported, the vibrational characteristic of CaTiO 3 was verified by Shi et al [396] in 2020.…”

Section: Abo 3 Formulamentioning

confidence: 85%

The latest process and challenges of microwave dielectric ceramics based on pseudo phase diagrams

et al. 2021

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The explosive process of 5G communication evokes the urgent demand of miniaturized and integrated dielectric ceramics filter. It is a pressing need to advance the development of dielectric ceramics utilization of emerging technology to design new materials and understand the polarization mechanism. This review provides the summary of the study of microwave dielectric ceramics (MWDCs) sintered higher than 1000 from 2010 up to now, °C with the purpose of taking a broad and historical view of these ceramics and illustrating research directions. To date, researchers endeavor to explain the structure-property relationship of ceramics with multitude of approaches and design a new formula or strategy to obtain excellent microwave dielectric properties. There are variety of factors that impact the permittivity, dielectric loss, and temperature stability of dielectric materials, covering intrinsic and extrinsic factors. Many of these factors are often intertwined, which can complicate new dielectric material discovery and the mechanism investigation. Because of the various ceramics systems, pseudo phase diagram was used to classify the dielectric materials based on the composition. In this review, the ceramics were firstly divided into ternary systems, and then brief description of the experimental probes and complementary theoretical methods that have been used to discern the intrinsic polarization mechanisms and the origin of intrinsic loss was mentioned. Finally, some perspectives on the future outlook for high-temperature MWDCs were offered based on the synthesis method, characterization techniques, and significant theory developments.

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“…Owing to selection rules, the spectra of STO contains fewer reflectivity minima relative to CTO. As the STO and interface incorporate CTO tilt patterns, further loss of reflectivity should occur 38 . Residuals are observed near 500 cm −1 and 560 cm −1 that decrease with decreasing period thickness (Fig.…”

Section: Mainmentioning

confidence: 99%

Emergent interface vibrational structure of oxide superlattices

Hoglund

Bao

O’Hara

et al. 2022

Nature

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As the length scales of materials decrease, the heterogeneities associated with interfaces become almost as important as the surrounding materials. This has led to extensive studies of emergent electronic and magnetic interface properties in superlattices1–9. However, the interfacial vibrations that affect the phonon-mediated properties, such as thermal conductivity10,11, are measured using macroscopic techniques that lack spatial resolution. Although it is accepted that intrinsic phonons change near boundaries12,13, the physical mechanisms and length scales through which interfacial effects influence materials remain unclear. Here we demonstrate the localized vibrational response of interfaces in strontium titanate–calcium titanate superlattices by combining advanced scanning transmission electron microscopy imaging and spectroscopy, density functional theory calculations and ultrafast optical spectroscopy. Structurally diffuse interfaces that bridge the bounding materials are observed and this local structure creates phonon modes that determine the global response of the superlattice once the spacing of the interfaces approaches the phonon spatial extent. Our results provide direct visualization of the progression of the local atomic structure and interface vibrations as they come to determine the vibrational response of an entire superlattice. Direct observation of such local atomic and vibrational phenomena demonstrates that their spatial extent needs to be quantified to understand macroscopic behaviour. Tailoring interfaces, and knowing their local vibrational response, provides a means of pursuing designer solids with emergent infrared and thermal responses.

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Lattice vibrational characteristics and dielectric properties of pure phase CaTiO3 ceramic

Cited by 17 publications

References 24 publications

Photostriction in CaTiO₃ ceramics under the illumination of a light emitting diode

Photostriction in CaTiO₃ ceramics under the illumination of a light emitting diode

The latest process and challenges of microwave dielectric ceramics based on pseudo phase diagrams

Emergent interface vibrational structure of oxide superlattices

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Lattice vibrational characteristics and dielectric properties of pure phase CaTiO3 ceramic

Cited by 17 publications

References 24 publications

Photostriction in CaTiO3 ceramics under the illumination of a light emitting diode

Photostriction in CaTiO3 ceramics under the illumination of a light emitting diode

The latest process and challenges of microwave dielectric ceramics based on pseudo phase diagrams

Emergent interface vibrational structure of oxide superlattices

Contact Info

Product

Resources

About

Photostriction in CaTiO₃ ceramics under the illumination of a light emitting diode

Photostriction in CaTiO₃ ceramics under the illumination of a light emitting diode