Relevant bibliographies by topics / Copper iron chalcogenide

Academic literature on the topic 'Copper iron chalcogenide'

Author: Grafiati
Published: 6 September 2023

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Journal articles on the topic "Copper iron chalcogenide"

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Singh, Udai R., Seth C. White, Stefan Schmaus, Vladimir Tsurkan, Alois Loidl, Joachim Deisenhofer, and Peter Wahl. "Evidence for orbital order and its relation to superconductivity in FeSe0.4Te0.6." Science Advances 1, no. 9 (October 2015): e1500206. http://dx.doi.org/10.1126/sciadv.1500206.

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The emergence of nematic electronic states accompanied by a structural phase transition is a recurring theme in many correlated electron materials, including the high-temperature copper oxide– and iron-based superconductors. We provide evidence for nematic electronic states in the iron-chalcogenide superconductor FeSe0.4Te0.6 from quasi-particle scattering detected in spectroscopic maps. The symmetry-breaking states persist above Tc into the normal state. We interpret the scattering patterns by comparison with quasi-particle interference patterns obtained from a tight-binding model, accounting for orbital ordering. The relation to superconductivity and the influence on the coherence length are discussed.
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Polevik, Alexey O., Alexey V. Sobolev, Iana S. Glazkova, Igor A. Presniakov, Valeriy Yu Verchenko, Joosep Link, Raivo Stern, and Andrei V. Shevelkov. "Interplay between Fe(II) and Fe(III) and Its Impact on Thermoelectric Properties of Iron-Substituted Colusites Cu26−xFexV2Sn6S32." Compounds 3, no. 2 (May 15, 2023): 348–64. http://dx.doi.org/10.3390/compounds3020027.

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Following the trend of finding better thermoelectric materials among synthetic analogs of copper–chalcogenide minerals, we have synthesized iron-bearing colusites of a general formula Cu26−xFexV2Sn6S32. They crystallize in the cubic space group P-43n with the unit cell parameter increasing linearly with the iron content. At a low iron concentration, the crystal structure features disorder manifested by an anti-site effect and a shift of a part of the tin atoms from their ideal positions, which is absent for higher iron contents. The magnetization and 57Fe/119Sn Mössbauer studies showed that, for x = 1, iron is present as Fe3+, whereas for x > 1, Fe2+ and Fe3+ coexist. Additionally, weak antiferromagnetic interactions between iron atoms and fast on the 57Fe Mössbauer time scale (107–109 s−1) electron transfer between adjacent Fe2+ and Fe3+ centers were revealed. Thermoelectric studies showed that iron-bearing colusites are p-type semiconductors with low thermal conductivity stemming from their complex crystal structure and structural disorder. The highest ZT of 0.78 at 700 K was found for the x = 1 iron content, where iron is present as Fe3+ only.
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Sha, Zhenzong, Ruibin Jia, Shuai Ma, Fengjin Xia, Jingru Tian, Liyan Yu, and Lifeng Dong. "Neo-heterojunction based on the kesterite copper chalcogenide semiconductor with magnetic iron-cation partial-substitution: In-situ room-temperature pulsed laser deposition and optoelectronic properties." Journal of Alloys and Compounds 906 (June 2022): 164359. http://dx.doi.org/10.1016/j.jallcom.2022.164359.

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Trifiletti, Vanira, Giorgio Tseberlidis, Marco Colombo, Alberto Spinardi, Sally Luong, Mati Danilson, Maarja Grossberg, Oliver Fenwick, and Simona Binetti. "Growth and Characterization of Cu2Zn1−xFexSnS4 Thin Films for Photovoltaic Applications." Materials 13, no. 6 (March 24, 2020): 1471. http://dx.doi.org/10.3390/ma13061471.

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Photovoltaics is a promising technology to produce sustainable energy, thanks to the high amount of energy emitted by the sun. One way of having solar cells with low production costs is to apply thin-film technology and with earth-abundant raw materials. A keen interest is arising in kesterite compounds, which are chalcogenides composed of abundant and non-toxic elements. They have already achieved excellent performance at the laboratory level. Here, we report the synthesis and characterization of mixed chalcogenides based on copper, zinc, iron, and tin. Solutions have been studied with different zinc and iron ratios. The distortion of the elementary cell of kesterite increases with the addition of iron until a phase transition to stannite occurs. The process of synthesis and deposition proposed herein is cheap and straightforward, based on the sol-gel technique. These thin films are particularly attractive for use in cheap and easily processable solar cells. The synthesized layers have been characterized by X-ray diffraction, UV-Vis absorption, and Raman, X-ray photoelectron, and energy-dispersive X-ray spectroscopy measurements.
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Medyanik, N., E. Leontieva, O. Mishurina, and E. Mullina. "STALE TAILINGS OF COPPER-CRUSTED ORES FLOTATION WITH THE POSSIBILITY OF GOLD AND SILVER SELECTIVE EXTRACTION: RESOURCE POTENTIAL ANALYSIS." Transbaikal State University Journal 27, no. 6 (2021): 31–39. http://dx.doi.org/10.21209/2227-9245-2021-27-6-31-39.

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The article analyzes the possibility and efficiency of processing stale tailings of flotation plants of the copper pyrite complex. The resource potential, material composition and technological capabilities of processing a number of technogenic objects are considered. The interrelation and influence of mineralogical and technological factors on the choice of tailings processing technology are analyzed. The results of chemical, mineral and phase analysis of stale flotation tailings of the studied pyrite ores are presented. According to the complex studies’ results, it is established that the stale flotation tailings of copper pyrite ores belong to a refractory type of geo-resources due to the high content of pyrite and low, at the level of ppm, gold and silver content, which are present mainly in the “resistant” minerals - chalcogenides, sulphides, their intergrowths. The article presents a factor analysis and conditions for the elemental composition of tailings formation: mineralogical, technological and environmental. The territorial accessibility and technological capability of the investigated technogenic formations are analyzed. In the course of experimental studies, the elemental composition of stale tailings has been revealed - the main components of which are: iron, sulfur, silicon and aluminum. According to the results of X-ray phase analysis, it has been found that the main ore mineral of the tailings is pyrite. At the same time, it is noted that the main share of gold in the stale flotation tailings is presented in the form of sulphides in the form of finely dispersed and isomorphic inclusions. The heterogeneous morphometric and mineral composition of sulphide aggregates, their difficult opening and high dispersion characterize stale tailings as a raw material that is difficult to float. The revealed features of the material composition of stale tails indicate the impossibility of extracting valuable components (gold and silver) from this resource using existing traditional technologies. It has been proved that it is possible to effectively extract precious metals from this category of raw materials only after their deep opening by chemical processing. The relevance of the research lies in the need to process gold-containing man-made waste in order to significantly expand the raw material base of mining enterprises, as well as to improve the ecological situation of the city-forming mining enterprises of the South Urals. The aim of the research is to study the material composition of stale tailings and develop a technology for selective extraction of gold and silver. The object of research is the stale flotation tailings of copper-pyrite enterprises of the Southern Urals. The subject is the mineral composition, the content of useful components of lying tailings and the technology of gold and silver selective extraction from them. Material and research methods. During the experiments, a set of physicochemical and chemical methods of analysis has been used: thermodynamic analysis, synchronous thermal analysis using a combined thermal analyzer of the Netzsch STA 449 F3 Jupiter brand, UV spectroscopy with an automated data processing system), qualitative chemical and assay analyzes
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Aldowiesh, Alaa, Panagiotis Mangelis, Paz Vaqueiro, and Anthony V. Powell. "The impact of a magnetic ion on the thermoelectric properties of copper-rich quaternary selenides." Journal of Physics: Energy, April 25, 2022. http://dx.doi.org/10.1088/2515-7655/ac6a11.

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Abstract A series of copper-based p-type chalcogenide semiconductors, Cu2+xBGe1-xSe4 (B = Zn, Fe; 0 ≤ x ≤ 0.15), was prepared by high temperature methods, to explore the impact of replacement of the closed-shell ion, Zn2+, with the magnetically active, Fe2+ cation. Powder X-ray diffraction in conjunction with Rietveld refinement reveals that zinc-containing materials are described in the kesterite-type structure (Space group: I4 ̅) and contain trace amounts of secondary phases, whereas in the iron analogues, described in the stannite-type structure (space group: I4 ̅2m), single-phase behaviour persists to x = 0.1. Excess copper ions lead to the formation of holes and the electrical resistivity of both series is reduced from that of the stoichiometric end members. In the case of the iron-containing materials, this is shown to be due to an increase in the hole mobility, µ. This decrease in resistivity offsets the observed reduction in Seebeck coefficient and both series exhibit an improvement in thermoelectric performance. The lower electrical resistivity of the iron-containing materials, leads to higher figures-of-merit, compared to those of the zinc-containing materials at the same level of copper excess. The maximum figure-of-merit, ZT = 0.3 is attained for Cu2.075FeGe0.925Se4 at the comparatively low temperature of 575 K. This is an increase of ca. 62 % from that of the end member phase and ca. 67% higher than that of the zinc analogue at the same level of substitution.
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Aldowiesh, Alaa, Panagiotis Mangelis, Paz Vaqueiro, and Anthony V. Powell. "The impact of a magnetic ion on the thermoelectric properties of copper-rich quaternary selenides." Journal of Physics: Energy, April 25, 2022. http://dx.doi.org/10.1088/2515-7655/ac6a11.

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Abstract A series of copper-based p-type chalcogenide semiconductors, Cu2+xBGe1-xSe4 (B = Zn, Fe; 0 ≤ x ≤ 0.15), was prepared by high temperature methods, to explore the impact of replacement of the closed-shell ion, Zn2+, with the magnetically active, Fe2+ cation. Powder X-ray diffraction in conjunction with Rietveld refinement reveals that zinc-containing materials are described in the kesterite-type structure (Space group: I4 ̅) and contain trace amounts of secondary phases, whereas in the iron analogues, described in the stannite-type structure (space group: I4 ̅2m), single-phase behaviour persists to x = 0.1. Excess copper ions lead to the formation of holes and the electrical resistivity of both series is reduced from that of the stoichiometric end members. In the case of the iron-containing materials, this is shown to be due to an increase in the hole mobility, µ. This decrease in resistivity offsets the observed reduction in Seebeck coefficient and both series exhibit an improvement in thermoelectric performance. The lower electrical resistivity of the iron-containing materials, leads to higher figures-of-merit, compared to those of the zinc-containing materials at the same level of copper excess. The maximum figure-of-merit, ZT = 0.3 is attained for Cu2.075FeGe0.925Se4 at the comparatively low temperature of 575 K. This is an increase of ca. 62 % from that of the end member phase and ca. 67% higher than that of the zinc analogue at the same level of substitution.
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Bhattacharyya, Biswajit, Christian Balischewski, Claudia Pacholski, Anshu Pandey, Ilko Bald, and Andreas Taubert. "Copper Iron Chalcogenide Semiconductor Nanocrystals in Energy and Optoelectronics Applications—State of the Art, Challenges, and Future Potential." Advanced Optical Materials, February 8, 2023, 2202411. http://dx.doi.org/10.1002/adom.202202411.

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Sharma, Charu, Avinash K. Srivastava, Deepak Sharma, and Raj K. Joshi. "Iron- and copper-based bifunctional catalysts for the base- and solvent-free C–N coupling of amines and aryl/benzyl chlorides under aerobic conditions." New Journal of Chemistry, 2022. http://dx.doi.org/10.1039/d2nj00593j.

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Dissertations / Theses on the topic "Copper iron chalcogenide"

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Anumol, S. "A Study of Synthesis and Optoelectronics of Copper Iron Chalcogenide Nanocrystals." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/4984.

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Copper iron chalcogenides constitute a promising class of optoelectronic materials courtesy of their narrow bandgaps and earth abundant constitution. However, they are yet to receive the attention they deserve due to the lack of easy synthetic protocols and poorly understood material properties. Discordant narratives in the literature regarding their optoelectronic properties has also prevented them from being used for device-based applications. This thesis is aimed at rectifying a few of these issues. The objective of this thesis is to synthesize and study the properties of copper iron chalcogenide nanocrystals viz., CuFeS2 and CuFeSe2, and to explore their utility in the context of optoelectronic devices. Chapter 1 provides a brief introduction to the fundamental concepts related to the work described in this thesis. The chapter further discusses the scope and motivation behind the work carried out in this thesis. Chapter 2 describes our efforts to assign the nature of a feature in the optical absorption spectrum of CuFeS2 nanocrystals occurring at ~500 nm. Using a combination of steady-state and time-resolved optical spectroscopy as well as transport measurements we assign the feature to be a localized surface plasmon resonance and attribute the peculiar properties exhibited by CuFeS2 nanocrystals to this feature. Further, the transport measurements revealed that films of these nanocrystals can support a photoresponse. Chapter 3 describes the fabrication and characterization of a broadband photodetector based on CuFeS2 nanocrystals. Briefly, we fabricated heterojunctions of CuFeS2 nanocrystals with bulk n type silicon and demonstrated a broadband photoresponse from 460 nm-2200 nm with response time of the order of microseconds. The photodetector was further found to possess a photothermal response that is bolometric in nature, which allows the device to sense hot objects at room temperature. Chapter 4 describes our efforts to synthesize and study the optoelectronic properties of CuFeSe2 and CuFeSe2-CdS core-shell nanocrystals. We synthesized CuFeSe2 nanocrystals and studied their properties using structural, optical and electrical characterization techniques. The nanocrystals were found to have a very narrow bandgap of 0.11 eV and were also found to exhibit a plasmon resonance at ~410 nm. We further found that the films of these nanocrystals exhibited a photoresponse in the MIR, thus making them a promising candidate for infrared photodetection. We further synthesized highly luminescent CuFeSe2-CdS core-shell nanocrystals and found that the energetic position of their emission is greatly dependent on the sequence in which the shell growth precursors are added to the reaction mixture. Using optical and structural characterization techniques, we find that there are two different core-shell variants that result from the synthesis and their formation is determined by which one of the shell growth precursors is added to the reaction mixture first. The key difference between the two variants were found to be the presence of an interfacial CdSe layer which occurs whenever the cation precursor is added to the reaction mixture first. Chapter 5 describes the synthesis of CuFexGa1-xS2 nanocrystals, a hitherto unknown composition of nanocrystals. Using alloying as a strategy, we synthesized CuFexGa1-xS2 nanocrystals corresponding to different Fe:Ga ratios. The properties of the resulting nanocrystals were found to be greatly dependent on their composition.
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Jieratum, Vorranutch. "Iron and copper chalcogenides : photovoltaic absorber candidates and YZrF��� : a new upconversion host." Thesis, 2012. http://hdl.handle.net/1957/31352.

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The materials Fe���(Si,Ge)(S,Se)���, Cu���PS[subscript 4-x]Se[subscript x] (0 ��� x ��� 4), and Cu���PxAs[subscript 1-x]S��� (0 ��� x ��� 1) have been synthesized and studied as new earth-abundant absorbers for single and multijunction photovoltaic cells as well as solar fuel generation. The synthesis, single-crystal growth, and optical and electrical properties of these materials are described and discussed in Chapter 2, 3, and 4. Inspired by the photovoltaic absorber Cu���ZnSnS���, the new compound CuZnPS��� has been discovered; its structure and properties are discussed in Chapter 5, including a comparative analysis to Cu���PS���. The compound YZrF��� (Chapter 6) has been synthesized and evaluated for the first time as a new optical host for green up-conversion.
Graduation date: 2013
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Conference papers on the topic "Copper iron chalcogenide"

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s, Anumol, Biswajit Bhattacharyya, V. V. R. Kishore, Abhinav Kumar, Guru Pratheep Rajasekar, D. D. Sarma, and Anshu Pandey. "Copper Iron Chalcogenide Nanocrystals: Spectroscopy and Devices." In nanoGe Fall Meeting 2019. València: Fundació Scito, 2019. http://dx.doi.org/10.29363/nanoge.ngfm.2019.333.

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s, Anumol, Biswajit Bhattacharyya, V. V. R. Kishore, Abhinav Kumar, Guru Pratheep Rajasekar, D. D. Sarma, and Anshu Pandey. "Copper Iron Chalcogenide Nanocrystals: Spectroscopy and Devices." In nanoGe Fall Meeting 2019. València: Fundació Scito, 2019. http://dx.doi.org/10.29363/nanoge.nfm.2019.333.

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