Comprehensive study of nanostructured Bi<sub>2</sub>Te<sub>3</sub> thermoelectric materials – insights from synchrotron radiation XRD, XAFS, and XRF techniques

Imam, N. G.; Elyamny, Shaimaa; Aquilanti, Giuliana; Pollastri, Simone; Gigli, Lara; Kashyout, Abd El-Hady B.

doi:10.1039/d3ra06731a

RSC Adv.

2024

DOI: 10.1039/d3ra06731a

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Comprehensive study of nanostructured Bi₂Te₃ thermoelectric materials – insights from synchrotron radiation XRD, XAFS, and XRF techniques

N. G. Imam,

Shaimaa Elyamny,

Giuliana Aquilanti

et al.

Abstract: A comprehensive study of nanostructured Bi2Te3 thermoelectric material was performed using a combination of synchrotron radiation-based techniques such as XAFS, and XRF, along with some other laboratory techniques such as XRD, XPS, FESEM, and HRTEM.

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Effect of Cu incorporation in silicate and modified borate bioglass materials for health applications: insights from synchrotron-based x-ray absorption spectroscopy

Imam,

Harfouche,

Abdelghany

et al. 2024

Discov Mater

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This contribution investigates the effect of variable copper incorporation (x = 0.2, 1.0, 2.0, and 4.0) in silicate (45 SiO2, 24.5 CaO, 24.5 Na2O, 6P2O5wt%) and modified borate (45 B2O3, 24.5 CaO, 24.5 Na2O, 6P2O5wt%) bioglass materials to be used for bone bonding applications. X-ray absorption fine structure spectroscopy (XAFS) has been used to determine the oxidation states and local coordination structure of Cu atoms in silicate-based and borate-based glasses at the Cu K-edge (~ 8979 eV). The oxidation states of Cu atoms have been determined by near-edge XAFS (XANES) fingerprinting employing reference standard compounds of Cu. Cu (I) and Cu (II) XANES spectra of the standard reference compounds were linearly combined to fit the normalized μ(E) data of the collected XANES spectra using linear combination fitting (LCF approach). The obtained results prove that most of the silicate glass samples contain Cu2O almost exclusively, while modified borate glass samples contain a significant mixture of Cu2O and CuO phases. According to the literature, the remarkable coexistence of Cu2O and CuO phases within the borate sample, particularly when x = 4, promotes the conversion process to allow the more facile formation of hydroxy carbonate apatite (HCA). The best fit structural parameters derived from extended-XAFS (EXAFS) fitting show that the ratio between Cu (I) and Cu (II) in borate glass agreed well with that extracted from XANES analysis. XANES and EXAFS conclude that borate glass with x = 4 is the most suitable composition for bone bonding applications.

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Effect of Cu incorporation in silicate and modified borate bioglass materials for health applications: insights from synchrotron-based x-ray absorption spectroscopy

Imam,

Harfouche,

Abdelghany

et al. 2024

Discov Mater

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Comprehensive study of nanostructured Bi₂Te₃ thermoelectric materials – insights from synchrotron radiation XRD, XAFS, and XRF techniques

Abstract: A comprehensive study of nanostructured Bi2Te3 thermoelectric material was performed using a combination of synchrotron radiation-based techniques such as XAFS, and XRF, along with some other laboratory techniques such as XRD, XPS, FESEM, and HRTEM.

Cited by 1 publication

References 58 publications

Effect of Cu incorporation in silicate and modified borate bioglass materials for health applications: insights from synchrotron-based x-ray absorption spectroscopy

Effect of Cu incorporation in silicate and modified borate bioglass materials for health applications: insights from synchrotron-based x-ray absorption spectroscopy

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Comprehensive study of nanostructured Bi2Te3 thermoelectric materials – insights from synchrotron radiation XRD, XAFS, and XRF techniques

Abstract: A comprehensive study of nanostructured Bi2Te3 thermoelectric material was performed using a combination of synchrotron radiation-based techniques such as XAFS, and XRF, along with some other laboratory techniques such as XRD, XPS, FESEM, and HRTEM.

Cited by 1 publication

References 58 publications

Effect of Cu incorporation in silicate and modified borate bioglass materials for health applications: insights from synchrotron-based x-ray absorption spectroscopy

Effect of Cu incorporation in silicate and modified borate bioglass materials for health applications: insights from synchrotron-based x-ray absorption spectroscopy

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Comprehensive study of nanostructured Bi₂Te₃ thermoelectric materials – insights from synchrotron radiation XRD, XAFS, and XRF techniques