Studies of the Sulfosalts of Copper III; Phases and Phase Relations in the System Cu-Sb-S

Skinner, Brian J.; Luce, Frederick D.; Makovicky, Emil

doi:10.2113/gsecongeo.67.7.924

Cited by 113 publications

(93 citation statements)

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“…[18,21]. The melting points of the mixed crystals increase linearly with an increasing content of As, as shown in Fig.…”

Section: Phase Analytical Investigationsmentioning

confidence: 92%

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The system Cu₃AsS₄–Cu₃SbS₄and investigations on normal tetrahedral structures

Pfitzner¹,

Bernert²

2004

Zeitschrift Für Kristallographie - Crystalline Materials

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X-ray diffraction / Powder diffraction structure analysis / Single crystal structure analysis / Thiometallate / Tetrahedral structures / Wurtzite structure type / Sphalerite structure type Abstract. In order to develop a novel model to predict if a so called normal tetrahedral compound crystallizes in a wurtzite-or sphalerite superstructure type, the system Cu 3 AsS 4 --Cu 3 SbS 4 was reinvestigated. A solid solution series was prepared and the mixed crystals were characterized by powder X-ray techniques. [MS 4 ] were calculated for the investigated compounds. In addition, the corresponding data were calculated for further solids from literature data. The volumes of the tetrahedra are used to separate compounds with a sphalerite type anion arrangement from compounds with hexagonal packed anions. A closer inspection of the tetrahedra volumes reveals a greater variation for one given material in the case of wurtzite type superstructures than for sphalerite type superstructures. A critical difference in the tetrahedra volumes is derived from these data.

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“…[18,21]. The melting points of the mixed crystals increase linearly with an increasing content of As, as shown in Fig.…”

Section: Phase Analytical Investigationsmentioning

confidence: 92%

“…Famatinite is reported to melt congruently at 627 C [18]. The melting points reported for enargite are not unique.…”

Section: Phase Analytical Investigationsmentioning

confidence: 99%

The system Cu₃AsS₄–Cu₃SbS₄and investigations on normal tetrahedral structures

Pfitzner¹,

Bernert²

2004

Zeitschrift Für Kristallographie - Crystalline Materials

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“…Non-stoichiometry has often been recorded in tetrahedrites, especially those without 2M 2 + substituting for two Cu atoms; however this does not significantly affect the analyses quoted in this paper. Work on the synthetic systems Cu-Sb-S and Cu-As-S (Cambi and Elli, 1965;Hall, 1972;Skinner et al, 1972;Maske and Skinner, 1971;Tatsuka and Morimoto, 1973;Luce et al, 1977;and Makovicky and Skinner, 1978) have revealed…”

Section: M2+mentioning

confidence: 99%

Silver substitution into synthetic zinc, cadmium, and iron tetrahedrites

Pattrick

Hall

1983

Mineral. mag.

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“…That curve shows three endothermic effects beginning at a temperature close to 540°, 580° and 600°C, respectively. The first effect may be ascribed to the decomposition process suggested by Skinner et al (1972) who, however, did not publish their DTA curve. The other two effects should correspond to the incongruent melting of the breakdown products, i.e., famatinite, skinnerite and high digenite.…”

Section: Thermal Behaviormentioning

confidence: 97%

Crystal Chemistry of Tetrahedrite Solid-Solution: Epr and Magnetic Investigations

Benedetto

Bernardini

Borrini

et al. 2002

The Canadian Mineralogist

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One hundred and thirty samples from the collection of the Natural History Museum in Florence, labeled as tetrahedrite, have been extensively studied by means of SEM, XRD, EPMA, DTA, EPR and SQUID techniques. Wide-ranging substitutions, confirmed by compositional data, play a fundamental role in the thermal behavior, "stabilizing" natural tetrahedrite with respect to the synthetic equivalent. In order to determine the valence state and site occupancies of Cu and Fe, electron paramagnetic resonance (EPR) and magnetic measurements were performed on selected samples of natural tetrahedrite. EPR measurements were performed down to 130 K, and magnetic susceptibility measurements, in the range 2-300 K. EPR magnetic parameters were determined on the basis of spectral simulations. The behaviour of --1 versus temperature was interpreted by means of Heisenberg's model, thus yielding values for the Curie and Weiss constants. All samples are characterized by the presence of small amounts of Cu 2+ and Fe 2+ ; Fe 3+ was detected only in metal-deficient samples. Both Cu and Fe occupy the tetrahedral site; whereas in some samples the former appears aggregated in dimers, the latter is randomly distributed over the lattice. The results of the study confirm the crystal-chemical formula of the tetrahedrite samples investigated.Keywords: tetrahedrite solid-solution, compositional data, thermal behavior, electron paramagnetic resonance, magnetic susceptibility, crystal chemistry, cupric ion. SOMMAIRENous avons caractérisé cent-trente échantillons appelés tétraédrite dans la collection du Musée d'Histoire Naturelle à Florence par microscopie électronique par balayage, diffraction X, analyse par microsonde électronique, analyse thermique différentielle, résonance paramagnétique des électrons, et la technique SQUID. Des substitutions d'étendue importante, confirmées par données chimiques, exercent un rôle fondamental dans le comportement thermique, "stabilisant" la tétraédrite naturelle par rapport à l'équivalent synthétique. Afin de déterminer la valence et la position de Cu et Fe, nous avons déterminé la résonance paramagnétique des électrons (RPE) d'échantillons naturels choisis jusqu'à 130 K, et les propriétés magnétiques sur l'intervalle 2-300 K. Les paramètres magnétiques des spectres RPE ont été déterminés par simulation. Le comportement de --1 en fonction de la température a été interpreté au moyen du modèle de Heisenberg, menant ainsi à une évaluation des constantes de Curie et de Weiss. Tous les échantillons contiennent de faibles quantités de Cu 2+ et de Fe 2+ . En revanche, on a décelé le Fe 3+ seulement dans les échantillons déficitaires en métaux. Le Cu et le Fe occupent le site tétraédrique. Tandis que le Cu semble agencé en dimères, le Fe serait plutôt distribué de façon aléatoire dans le réseau. Les résultats de notre étude confirment la formule cristallochimique des échantillons de tétraédrite étudiés. (Traduit par la Rédaction)Mots-clés: solution solide de la tétraédrite, données sur la composition, comportemen...

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Studies of the Sulfosalts of Copper III; Phases and Phase Relations in the System Cu-Sb-S

Cited by 113 publications

References 0 publications

The system Cu₃AsS₄–Cu₃SbS₄and investigations on normal tetrahedral structures

The system Cu₃AsS₄–Cu₃SbS₄and investigations on normal tetrahedral structures

Silver substitution into synthetic zinc, cadmium, and iron tetrahedrites

Crystal Chemistry of Tetrahedrite Solid-Solution: Epr and Magnetic Investigations

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Studies of the Sulfosalts of Copper III; Phases and Phase Relations in the System Cu-Sb-S

Cited by 113 publications

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The system Cu3AsS4–Cu3SbS4and investigations on normal tetrahedral structures

The system Cu3AsS4–Cu3SbS4and investigations on normal tetrahedral structures

Silver substitution into synthetic zinc, cadmium, and iron tetrahedrites

Crystal Chemistry of Tetrahedrite Solid-Solution: Epr and Magnetic Investigations

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The system Cu₃AsS₄–Cu₃SbS₄and investigations on normal tetrahedral structures

The system Cu₃AsS₄–Cu₃SbS₄and investigations on normal tetrahedral structures