Anomalies of electric and magnetic properties of ternary cobalt sulfides

Loseva, G. V.; Abramova, G. M.

doi:10.1002/pssa.2210800171

Cited by 2 publications

(2 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It should be noted that XRD analysis before and after heating did not show any variation in the mineral phase composition of the solids tested. The complex form of these graphs, in comparison with the plots obtained for simple sulfides, − is indicative of the fact that they correspond to semiconductors doped with impurities, which introduce additional energy levels in the semiconductor energy gap. These energy levels are activated in a well-defined temperature region .…”

Section: Resultsmentioning

confidence: 82%

Properties of Cu(II) and Ni(II) Sulfides Prepared by Coprecipitation in Aqueous Solution

et al. 1999

View full text Add to dashboard Cite

Among semiconductors, metal sulfides are very interesting materials that may be used for solar energy conversion arrangements. We prepared a series of Cu x Ni1 - x S powders, where x = 0.05, 0.20, 0.50, and 0.80, by spontaneous precipitation. Various stoichiometries of Cu(NO3)2, Ni(NO3)2, and (NH4)2S solutions at 25 °C and pH 2.50, at conditions in which the aqueous solutions were supersaturated with respect to CuS and NiS, yielded precipitates corresponding to intermediate mixed sulfides. The appearance of new peaks in the powder X-ray diffraction spectra suggested the formation of new phases. Measurements of the resistance of the bulk solids as a function of temperature for the preparations with x = 0.05, 0.20, and 0.50 showed a decrease with increasing temperature. A hysteresis was found upon thermal cycling of the sulfide preparations, possibly due to changes in the solid state that affect the energy bands of the semiconductors. The Cu and Ni sulfide preparations with x = 0.80 showed metallic behavior. All preparations were highly charged when suspended in aqueous media, and the electrical charge was found to depend strongly on the activity of copper ion in solutions equilibrated with the solid phase. Finally, current potential curves of electrodes prepared from the precipitated sulfides under constant illumination gave values for the open circuit potential as high as 0.868 V, with 0.119 mA for the photocurrent and 0.58 for the field factor. These values are encouraging for the potential application of these materials in cells for the conversion of solar into electric energy.

show abstract

Section: Resultsmentioning

confidence: 82%

Properties of Cu(II) and Ni(II) Sulfides Prepared by Coprecipitation in Aqueous Solution

et al. 1999

View full text Add to dashboard Cite

show abstract

“…Phase transitions in ferroelectric Eb2ZnCl4 crystals were examined by dielectric measurements and DTA from -120 to 100° (35). DTA, electrical resistivity, and magnetization of CoxCu1_xS (x = 0.5) showed anomalies at 950°i ndicating a transition from a less conductive state to a more conductive one (93). Galvanic cells of the type, (C 4-Cl2)(NaCl(s))(MCl2s))(MCl2(s))(C + Cl2), give emfs > 280°, which are due to the formation of ternary chlorides, Na"MCl"+2 (128).…”

Section: Electrical Methodsmentioning

confidence: 99%

Thermal analysis

Wendlandt¹

1986

Anal. Chem.

View full text Add to dashboard Cite

Anomalies of electric and magnetic properties of ternary cobalt sulfides

Cited by 2 publications

References 1 publication

Properties of Cu(II) and Ni(II) Sulfides Prepared by Coprecipitation in Aqueous Solution

Properties of Cu(II) and Ni(II) Sulfides Prepared by Coprecipitation in Aqueous Solution

Thermal analysis

Contact Info

Product

Resources

About