Mutual Pb2+/Sn2+ substitution in sulfosalts

Moh, G. H.

doi:10.1007/bf01163259

Cited by 9 publications

(6 citation statements)

References 2 publications

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“…To probe the stoichiometry analysis, we employed energy-dispersive X-ray spectroscopy technique that results in an approximate chemical formula Pb6Sn3Sb3FeS18 (see the Supplementary Information), which falls within the generic chemical formula (Pb, Sn) 6+x 2+ Sb 2 3+ Fe 2+ Sn 2 4+ S 14+x , where −1 ≤ 𝑥 ≤ 0.25 of materials from a mine in Bolivia. 6 This confirms the origin of our samples which are originated from a mine in San Jose, Bolivia.…”

supporting

confidence: 80%

“…To probe the stoichiometry analysis, we employed the energy-dispersive X-ray (EDX) spectroscopy technique, which results in an approximate chemical formula of Pb S 14+x , where −1 ≤ x ≤ 0.25, of materials from a mine in Bolivia. 8,9 This confirms the origin of our samples, which originate from a mine in San Jose, Bolivia.…”

supporting

confidence: 80%

“…The complex Q layers contain four atomic layers of sulfide compounds with the formula MX, where M = Sn 2+ , Pb 2+ , or Sb 2+ and X = S. The H layer is a simple binary layer and consists of octahedra of disulfide compounds with the formula MX 2 , where M = Sn 4+ and Fe 2+ and X = S. We have presented schematically the crystal structure of the layered materials in Figure a. To probe the stoichiometry analysis, we employed the energy-dispersive X-ray (EDX) spectroscopy technique, which results in an approximate chemical formula of Pb 6 Sn 3 Sb 3 FeS 18 (see the Supporting Information), which falls within the generic chemical formula (Pb, Sn) 6+ x 2+ Sb 2 3+ Fe 2+ Sn 2 4+ S 14+ x , where −1 ≤ x ≤ 0.25, of materials from a mine in Bolivia. , This confirms the origin of our samples, which originate from a mine in San Jose, Bolivia.…”

Section: Resultsmentioning

confidence: 99%

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Photoresponse of Natural van der Waals Heterostructures

et al. 2017

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Van der Waals (vdW) heterostructures consisting of two dimensional materials offer a platform to obtain material by design and are very attractive owing to novel electronic states. Research on 2D van der Waals heterostructures (vdWH) has so far been focused on fabricating individually stacked atomically thin unary or binary crystals. Such systems include graphene (Gr), hexagonal boron nitride (h-BN) and member of the transition metal dichalcogenides family. Here we present our experimental study of the opto-electronic properties of a naturally occurring vdWH, known as Franckeite, which is a complex layered crystal composed of lead, tin, antimony, iron and sulfur. We present here that thin film franckeite (60 nm < d < 100 nm) behave as narrow band gap semiconductor demonstrating a wide band photoresponse. We have observed the band-edge transition at ~ 1500 nm (~830 meV) and high external quantum efficiency (EQE~3%) at room temperature. Laser power resolved and temperature resolved photocurrent measurements reveal that the photo-carrier generation and recombination are dominated by continuously distributed trap states within the band gap. To understand wavelength resolved photocurrent, we also calculated the optical absorption properties via density functional theory. Finally, we have shown that the device has fast photoresponse with rise time as fast as ~ 1 ms. Our study provides a fundamental understanding of the optoelectronic behavior in a complex naturally occurring vdWH and can open up the possibilities of producing new type of nanoscale optoelectronic devices with tailored properties.

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supporting

confidence: 80%

supporting

confidence: 80%

Section: Resultsmentioning

confidence: 99%

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Photoresponse of Natural van der Waals Heterostructures

et al. 2017

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“…The mutual Pb 2+ / Sn 2+ substitution in the structure of sul des and sulfosalts is well known (Moh, 1987), and this series is a typical example. Natural occurrences of herzenbergite-teallite minerals have been reported from several localities (Nekrasov et al, 1974;Berndt, 1954;Hayashi, 1986, Smeds, 1993), the most important of these being the Bolivian polymetallic ores.…”

Section: Introductionmentioning

confidence: 97%

A re-examination of herzenbergite–teallite solid solution at temperatures between 300 and 700°C

Hayashi

Kitakaze

Sugaki³

2001

Mineral. mag.

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In order to investigate the range of the solid solution series in herzenbergite-teallite minerals, samples of different composition were synthesized. Herzenbergite-teallite minerals were synthesized by an evacuated silica glass tube method at 7008C. A linear relationship between cell dimensions, a, b and c and composition is established. Extension of solid solution to the Pb-rich portion of the system PbSSnS is limited; the solid solution area is between Pb 1.060 Sn 0.940 S 2 and SnS at 7008C. Teallite coexisting with galena was also synthesized by hydrothermal recrystallization at 300, 400 and 4508C. The compositions of teallite are Pb 1.140 Sn 0.860 S 2 at 3008C, Pb 1.114 Sn 0.886 S 2 at 4008C, and Pb 1.124 Sn 0.876 S 2 at 4508C, respectively. Their compositions shift towards the PbS end-member from stoichiometric teallite. The cell dimensions of teallite, which was synthesized hydrothermally, follow the linear relationship between cell dimensions and composition established at 7008C.

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“…Sn 4+ 2S14+x, with -1 ≤ x ≤ 0.25 21 . Franckeite constitutes a natural misfit compound mineral, whose superlattice structure has been formed by alternating phase segregation of pseudo-hexagonal Sn-rich and pseudo-tetragonal Pb-rich layers, separated by a van der Waals gap (Figure 1(a)).…”

Section: Introductionmentioning

confidence: 99%