Electronic environments in carrollite, CuCo2S4, determined by soft X-ray photoelectron and absorption spectroscopy

Buckley, Alan N.; Skinner, William; Harmer, Sarah L.; Pring, Allan; Fan, Liang‐Jen

doi:10.1016/j.gca.2009.05.030

Cited by 39 publications

(17 citation statements)

References 74 publications

(105 reference statements)

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“…This notwithstanding, carrollite has been traditionally considered a 2-3 species, Cu 2þ Co 3þ 2 ðS 2À Þ 4 (e.g., Charnock et al, 1990). Recently, Pattrick et al (2008) and Buckley et al (2009) investigated the formal charge of Co in carrollite through spectroscopic techniques. Both studies confirmed Cu 1+ , but the charge of Co is still under question.…”

Section: Issues In the Classification Of Chalcospinels According To Tmentioning

confidence: 99%

“…Pattrick et al (2008) suggested a Co charge between +2 and +3 along with the charge-arrangement Cu 1+ (Co 2+ Co 3+ ) (S 1.5-) 4 . In contrast, Buckley et al (2009), on the basis of a study by Wada et al (2002), proposed a low-spin Co 3+ with a charge for S only 12.5% less negative than -2, which leads to the charge arrangement Cu 1þ Co 3þ 2 ðS 1:75À Þ 4 . With regard to fletcherite, there are only two studies (Craig & Carpenter, 1977;Ostwald, 1985) that provide chemical data.…”

Section: Issues In the Classification Of Chalcospinels According To Tmentioning

confidence: 99%

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Nomenclature and classification of the spinel supergroup

Bosi

Biagioni

Pasero

2019

ejm

103

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A new, IMA-approved classification scheme for the spinel-supergroup minerals is here reported. To belong to the spinel supergroup, a mineral must meet two criteria: (i) the ratio of cation to anion sites must be equal to 3:4, typically represented by the general formula AB 2 X 4 where A and B represent cations (including vacancy) and X represents anions; (ii) its structure must comprise a heteropolyhedral framework of four-fold coordination polyhedra (TX 4) isolated from each other and sharing corners with the neighboring six-fold coordination polyhedra (MX 6), which, in turn, share six of their twelve X-X edges with nearestneighbor MX 6. Regardless of space group, the X anions form a cubic close-packing and each X anion is bonded to three M-cations and one T-cation. The fifty-six minerals of the spinel supergroup are divided into three groups on the basis of dominant X anion: O 2-(oxyspinel), S 2-(thiospinel), and Se 2-(selenospinel). Each group is composed of subgroups identified according to the dominant valence and then the dominant constituent (or heterovalent pair of constituents) represented by the letter B in the formula AB 2 X 4. The oxyspinel group (33 species) can be divided into the spinel subgroup 2-3 ðA 2þ B 3þ 2 O 4 Þ and the ulvöspinel subgroup 4-2 ðA 4þ B 2þ 2 O 4 Þ, the thiospinel group (20 species) into the carrollite subgroup 1-3.5 ðA 1þ B 3:5þ 2 S 4 Þ and the linnaeite subgroup 2-3 ðA 2þ B 3þ 2 S 4 Þ, finally, the selenospinel group (3 species) into the bornhardtite subgroup 2-3 (A 2+ B 3+ 2 Se 4) and the potential ''tyrrellite subgroup'' (A 1þ B 3:5þ 2 S 4 , currently composed by only one species). Once the subgroup is established based on the valence of B, then the mineral species is identified by the combination of the dominant A-and B-cations. Moreover, the present nomenclature redefines the ideal formulae of titanomaghemite, cuprorhodsite, malanite, maghemite, filipstadite, tegengrenite, rhodostannite, toyohaite and xingzhongite as well as discredits ''iwakiite'', ''hydrohetaerolite'' and ''ferrorhodsite''.

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Section: Issues In the Classification Of Chalcospinels According To Tmentioning

confidence: 99%

Section: Issues In the Classification Of Chalcospinels According To Tmentioning

confidence: 99%

Nomenclature and classification of the spinel supergroup

Bosi

Biagioni

Pasero

2019

ejm

103

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“…The oxidation state of cobalt in linnaeite has to our knowledge not been constrained by X-ray spectroscopy. Based on comparison with the valence of sulphur in carrollite, member of the thiospinel minerals of the linnaeite group, the total oxidation state of the 4 sulphurs in linnaeite could be −VI (Pattrick et al, 2008), − VII (Buckley et al, 2009) each sulphur having a valence of −II. The valence for Co could vary from three Co(II) to one Co(II) plus two Co(III).…”

Section: Discussionmentioning

confidence: 99%

Factors controlling the precipitation of copper and cobalt minerals in sediment-hosted ore deposits: Advances and restrictions

Muchez

Corbella

2012

Journal of Geochemical Exploration

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“…As a result, CuCo 2 S 4 has been developed for energy applications, but there are only a few studies in the literature on the synthesis and application of these materials. [1][2][3] For example, Chauhan et al 2 synthesized CuCo 2 S 4 nanosheets by a hydrothermal method and used the produced materials in a hydrogen production application. Similarly, CoNi 2 S 4 and CuCo 2 S 4 were obtained with a solvothermal technique by Ge et al 4 for use in hydrogen production.…”

Section: Introductionmentioning

confidence: 99%

Ternary CuCo2S4 Thiospinel Nanocrystal-Coated Photodiode with Improved Photoresponsivity and Acceptance Angles for Optoelectronic Applications

Yıldırım

Koçyiğit

Sarılmaz

et al. 2019

Journal of Elec Materi

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Ternary-structured thiospinels have attracted great attention in recent years for energy applications due to their attractive characteristics such as simple production, earth-abundant components and non-toxic nature. In this work, copper cobalt sulfide (CuCo 2 S 4 or carrollite) thiospinel nanocrystals were synthesized by a hot-injection method, and detailed electrical and optoelectronic characterizations were performed in a Schottky device. The synthesized nanocrystals were used as an interfacial layer between the Au metal and p-Si semiconductor to obtain an Au/CuCo 2 S 4 /p-Si device. The structural and morphological characterizations confirmed the crystallinity, nanostructure and composition of the CuCo 2 S 4 nanocrystals. The I-V and C-V measurements were employed to characterize the Au/CuCo 2 S 4 /p-Si device for various illumination intensities. The obtained device exhibited good rectifying and photodiode properties as well as good photocapacitance. The Au/CuCo 2 S 4 /p-Si device can be used and improved for optoelectronic applications.

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Electronic environments in carrollite, CuCo2S4, determined by soft X-ray photoelectron and absorption spectroscopy

Cited by 39 publications

References 74 publications

Nomenclature and classification of the spinel supergroup

Nomenclature and classification of the spinel supergroup

Factors controlling the precipitation of copper and cobalt minerals in sediment-hosted ore deposits: Advances and restrictions

Ternary CuCo2S4 Thiospinel Nanocrystal-Coated Photodiode with Improved Photoresponsivity and Acceptance Angles for Optoelectronic Applications

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