Ca2+ - substitution effect on the electronic structure of CaCu3Ti4O12 studied by electron spectroscopy for chemical analysis

Jani, Komal K.; Barad, Divyesh V.; Raval, Pooja Y.; Nehra, Monika; Vasoya, Nimish H.; Jakhar, Narendra; Modi, K. B.; Kumar, Sandeep; Lim, Dong Kwon; Singhal, R. K.

doi:10.1016/j.ceramint.2020.10.138

Cited by 7 publications

(2 citation statements)

References 21 publications

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“…The divalent state of the Ca ions or the Ca 2+ states can be assigned to these energy levels using the conventional binding energy value tables. Furthermore, it is confirmed that Ca ions exist in the +2 state in all the compositions by the observed difference in binding energies of these two peaks (∼3.50 eV), 170 which is consistent with the typical binding energy value reported for calcium carbonate (∼3.45 eV). 171…”

Section: Microstructural Characterization Of Quadruple Perovskite Oxidessupporting

confidence: 86%

Research progress on quadruple perovskite oxides

Ding,

Zhu

2024

J. Mater. Chem. C

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Section: Microstructural Characterization Of Quadruple Perovskite Oxidessupporting

confidence: 86%

Research progress on quadruple perovskite oxides

Ding,

Zhu

2024

J. Mater. Chem. C

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“…The high-resolution Ca 2p spectra of the model samples treated with lime water revealed two peaks with binding energies of 347.1 eV and 350.6 eV for the Ca 2p 1/2 and Ca 2p 3/2 states, respectively The difference between the two peaks was approximately 3.5 eV, indicating that calcium had a valence of + 2 [53,54].…”

Section: Xps Spectra Of the Porcine Blood Hydrogelsmentioning

confidence: 97%

Mechanism for formation of porcine blood hydrogels used as additives in the mortar of traditional Chinese architectural painting

Cheng,

Zhu,

Zhang

et al. 2024

Herit Sci

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Ancient Chinese architecture drawing is a unique form of ancient Chinese art. Porcine blood hydrogels are distinctive ingredients used to prepare the composite material of the substrate layer for architecture drawing. This investigation was focused on the mechanism for porcine blood hydrogel formation. Based on the traditional Chinese recipe for the preparation of porcine blood-lime mortar, samples with different ratios of porcine blood and lime water were prepared, and the molecular-scale interactions between the lime water and proteins in the porcine blood were examined with FTIR spectroscopy, Raman spectroscopy, XRD, XPS, fluorescence spectroscopy, contact angle and rheology studies. The mechanical properties and morphological features of the samples were detected with a rheometer, universal material testing machine and SEM. The results indicated that an appropriate amount of lime water was required for gelation of the porcine blood. With the appropriate alkalinity, sufficient carboxyl groups on the fibrin chains were deprotonated, and coordination with Ca2+ ions formed enough cross-links for support networks within the structure of the porcine blood hydrogel. Complexation of deprotonated carboxyl groups on the fibrin chains with Ca2+ ions led to the formation of a hydrophobic surface due alterations of the fibrin conformation and increased the adhesive properties of the hydrogel. With the hydrogel used as an ingredient in the preparation of a substrate layer composite, it is suggested that the hydrophobic surface of the hydrogel facilitated mixing with hydrophobic tung oil during preparation of the composite material, and strong adhesion of the hydrogel increased the mechanical strength and crack resistance of the substrate layer.

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