Assessing phase discrimination via the segmentation of an elemental energy dispersive X-ray spectroscopy map: a case study of Bi2Te3 and Bi2Te2S

Byrnes, J.; Gazder, Azdiar A.; Yamini, Sima Aminorroaya

doi:10.1039/c7ra08594j

Cited by 3 publications

(4 citation statements)

References 17 publications

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“…Here, superscripts (1) and (2) were used to distinguish the two types of atomic bonding, where (1) denotes a weak van der Waals attraction and (2) denotes a covalent bonding. Note that this crystal structure has been erroneously referred to as “Bi 2 Te 2 S” in some works. , Pauling realized that the “Bi 2 Te 2 S” crystal structure was unlikely to be stable at this stoichiometry due to a substantial strain localized on the internal sulfur layer within the stacking sequence. This strain is due to the considerable difference in ionic radii between S and Te, which would result in a large size mismatch between the hexagonal, closely packed S and Te layers.…”

Section: Results and Discussionmentioning

confidence: 99%

Thermoelectric Properties of Single-Phase n-Type Bi₁₄Te₁₃S₈

Fortulan,

Aminorroaya Yamini,

Juri

et al. 2024

ACS Appl. Electron. Mater.

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Bismuth telluride (Bi 2 Te 3 ) and its alloys are among the best thermoelectric materials at room temperature. Bi 14 Te 13 S 8 , a material with a similar crystal structure, contains sulfur that can potentially improve the thermoelectric performance through widening the band gap and reducing the lattice thermal conductivity. This compound forms in sulfur-added Bi 2 Te 3 alloys. Here, a polycrystalline iodine-doped Bi 14 Te 13 S 8 sample is investigated; an optimum iodine concentration of 1 at. % resulted in the power factor of 3.5 mW 2 •m −1 •K −1 at room temperature. Iodine doping reduced the lattice thermal conductivity by more than 30% by enhancing the phonon scattering. An improved thermoelectric figure of merit zT of ∼0.29 at 520 K was obtained for 1−1.5 at. % iodine-doped Bi 14 Te 13 S 8 . First-principles calculations indicate that Bi 14 Te 13 S 8 has a larger band gap compared to bismuth telluride, which allows for a reduction in the bipolar effect; however, a lower effective mass reduced the thermopower for a similar carrier concentration. This study demonstrates that tuned iodine doping can effectively optimize the thermoelectric performance of Bi 14 Te 13 S 8 , highlighting its contribution in multiphase sulfur-alloyed Bi 2 Te 3 -based materials.

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Section: Results and Discussionmentioning

confidence: 99%

Thermoelectric Properties of Single-Phase n-Type Bi₁₄Te₁₃S₈

Fortulan,

Aminorroaya Yamini,

Juri

et al. 2024

ACS Appl. Electron. Mater.

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“…It is worth noting that this crystal structure has been indexed as Bi 2 Te 2 S in the XRD databases of the Inorganic Crystal Structure Database (ICSD) and Open Quantum Materials Database (OQMD). Consequently, we used this to identify phases in our previous work, and in fact, the phase labeled the Bi 2 Te 2 S phase in our previous report is the Bi 14 Te 13 S 8 phase. We acknowledge the incorrect labeling of the Bi 14 Te 13 S 8 phase as Bi 2 Te 2 S in our previous study and refer to it as Bi 14 Te 13 S 8 in this work.…”

Section: Resultsmentioning

confidence: 99%

“…The electronic transport properties of bismuth chalcogenides are affected by the fraction of individual phases. , Therefore, we employed a combination of an EBSD technique and EDS mapping to discriminate the Bi 2 Te 3 and Bi 14 Te 13 S 8 phases …”

Section: Resultsmentioning

confidence: 99%

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Room-Temperature Thermoelectric Performance of n-Type Multiphase Pseudobinary Bi₂Te₃–Bi₂S₃ Compounds: Synergic Effects of Phonon Scattering and Energy Filtering

Yamini

Santos

Fortulan

et al. 2023

ACS Appl. Mater. Interfaces

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Bismuth telluride-based alloys possess the highest efficiencies for the low-temperature-range (<500 K) applications among thermoelectric materials. Despite significant advances in the efficiency of p-type Bi2Te3-based materials through engineering the electronic band structure by convergence of multiple bands, the n-type pair still suffers from poor efficiency due to a lower number of electron pockets near the conduction band edge than the valence band. To overcome the persistent low efficiency of n-type Bi2Te3-based materials, we have fabricated multiphase pseudobinary Bi2Te3–Bi2S3 compounds to take advantages of phonon scattering and energy filtering at interfaces, enhancing the efficiency of these materials. The energy barrier generated at the interface of the secondary phase of Bi14Te13S8 in the Bi2Te3 matrix resulted in a higher Seebeck coefficient and consequently a higher power factor in multiphase compounds than the single-phase alloys. This effect was combined with low thermal conductivity achieved through phonon scattering at the interfaces of finely structured multiphase compounds and resulted in a relatively high thermoelectric figure of merit of ∼0.7 over the 300–550 K temperature range for the multiphase sample of n-type Bi2Te2.75S0.25, double the efficiency of single-phase Bi2Te3. Our results inform an alternative alloy design to enhance the performance of thermoelectric materials.

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EDS-PhaSe: Phase Segmentation and Analysis from EDS Elemental Map Images Using Markers of Elemental Segregation

Beniwal,

Shivam,

Palasyuk

et al. 2023

Metallogr. Microstruct. Anal.

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Assessing phase discrimination via the segmentation of an elemental energy dispersive X-ray spectroscopy map: a case study of Bi₂Te₃ and Bi₂Te₂S

Abstract: The present case study critically assesses the efficacy of a previously proposed segmentation methodology as a means to discriminate phases via post-processing the image of an elemental map.

Cited by 3 publications

References 17 publications

Thermoelectric Properties of Single-Phase n-Type Bi₁₄Te₁₃S₈

Thermoelectric Properties of Single-Phase n-Type Bi₁₄Te₁₃S₈

Room-Temperature Thermoelectric Performance of n-Type Multiphase Pseudobinary Bi₂Te₃–Bi₂S₃ Compounds: Synergic Effects of Phonon Scattering and Energy Filtering

EDS-PhaSe: Phase Segmentation and Analysis from EDS Elemental Map Images Using Markers of Elemental Segregation

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Assessing phase discrimination via the segmentation of an elemental energy dispersive X-ray spectroscopy map: a case study of Bi2Te3 and Bi2Te2S

Abstract: The present case study critically assesses the efficacy of a previously proposed segmentation methodology as a means to discriminate phases via post-processing the image of an elemental map.

Cited by 3 publications

References 17 publications

Thermoelectric Properties of Single-Phase n-Type Bi14Te13S8

Thermoelectric Properties of Single-Phase n-Type Bi14Te13S8

Room-Temperature Thermoelectric Performance of n-Type Multiphase Pseudobinary Bi2Te3–Bi2S3 Compounds: Synergic Effects of Phonon Scattering and Energy Filtering

EDS-PhaSe: Phase Segmentation and Analysis from EDS Elemental Map Images Using Markers of Elemental Segregation

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Assessing phase discrimination via the segmentation of an elemental energy dispersive X-ray spectroscopy map: a case study of Bi₂Te₃ and Bi₂Te₂S

Thermoelectric Properties of Single-Phase n-Type Bi₁₄Te₁₃S₈

Thermoelectric Properties of Single-Phase n-Type Bi₁₄Te₁₃S₈

Room-Temperature Thermoelectric Performance of n-Type Multiphase Pseudobinary Bi₂Te₃–Bi₂S₃ Compounds: Synergic Effects of Phonon Scattering and Energy Filtering