Pyroelectric effect of Sb Se<sub>0.50</sub>S<sub>0.50</sub>I in an applied electric field

Chaves, Renata; Amaral, Maria Helena; Bałkanski, M.; Levelut, A.; Ziółkiewicz, S.

doi:10.1080/00150198308260675

Cited by 2 publications

(1 citation statement)

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“…Solids made up of mixed anions have been taken up by researchers to explore newer crystal chemistry and discover many interesting properties such as high-temperature superconductivity, optical properties, second-harmonic generation (SHG), piezoelectricity, pyroelectricity, etc. − If such mixed-anion compounds are layered, then they show interesting intercalation behavior and direction-dependent properties. In oxyhalides, oxyhydrides, oxysulfides, and oxynitrides, the oxide anions are partially replaced with the hetero anion, and their differing charge, ionic radii, electronegativity, and polarizability act as tools to tailor their desired function. − Bismuth based compounds, showing strong photooxidation ability, were widely investigated as photocatalysts to split water and in environment remedial applications. − Bismuth oxychloride (BiOCl) comprising of [Bi 2 O 2 ] 2+ slabs interleaved with two layers of Cl – ions arranged in a layered fashion presents a prototype example to comprehend the role of mixed anion system in many bismuth-containing oxychlorides .…”

Section: Introductionmentioning

confidence: 99%

Hole and Electron Doping Outcomes in Bi₂YO₄Cl

Pandey,

Yadav,

Yadav

et al. 2023

Inorg. Chem.

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Recognizing the deficiency in the hole and electron doping outcomes in layered bismuth-based oxyhalides intergrowths, the current study was addressed to the doping of Ca2+ and Zr4+ for Y3+ in Bi2YO4Cl. The samples were rapidly synthesized by a sol–gel auto combustion method and characterized extensively. Up to 30 mol % Y could be substituted with Ca in tetragonal symmetry and without the appearance of any additional phase. The unit cell parameters varied nonlinearly with the elongation of the Y–O bond. The Raman spectra supported the local site distortion. The calcium-substituted samples displayed selected area electron diffraction characteristics similar to those of Bi2YO4Cl. A blueshift of the absorption edge was noticed with increasing calcium content yielding optical band gap values in the 2.40–2.57 eV range. The creation of 10% Bi5+ in Bi2Y0.70Ca0.30O4Cl was established with the help of XPS measurements and redox titrations. The higher reactivity of Bi5+ in an aqueous solution has been demonstrated for the oxidation of As(III) to As(V). Electron doping through Zr4+ incorporation was possible up to 30 mol % in Bi2YO4Cl. The Y–O bonds are contracted, and the Bi–O bonds are elongated with increasing Zr4+ content. Zr4+’s incorporation induced a local distortion. The color of the sample changed from bright yellow to deep yellow with Zr inclusion, resulting in a progressive decrease in optical band gap values. The introduction of electrons caused the reduction of 13.6% of Bi(III) to Bi(0). These results have established the vulnerability of Bi2O2 chains to charge carriers in Bi2YO4Cl. Density functional theory (DFT) calculations were implemented to understand the electronic and optical properties of the pristine and doped compounds. From the band structure calculations, the chosen compounds were found to be indirect band gap semiconductors. The results of the DFT calculations were in good agreement with the experiment; however, for the doped cases, virtual crystal approximation has been used considering uniform doping at the Y-site.

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