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Diffusion in copper sulphides. An experimental study of chalcocite, chalcopyrite and bornite

Abstract

Diffusion measurements on three copper-containing sulphides have been performed by an electrochemical potentiometric method. Chalcocite (Cu{sub 2}S), Chalcopyrite (CuFeS{sub 2}) and Bornite (Cu{sub 5}FeS{sub 4}) were synthesized and fully characterized by X-ray diffraction. The diffusivities were measured on compacted powders yielding both the chemical and the component diffusion coefficients in the temperature range 5-50 C. The chemical diffusion coefficients found were: for Chalcocite 38.7*exp (-5600/T), for Chalcopyrite 15.4*exp(-6000/T) and for Bornite 14.4*exp(-4900/T). The diffusion coefficient for Chalcocite is in good agreement with values found previously, and a reasonable agreement is also found for Chalcopyrite and Bornite when our data are compared with values acquired at much higher temperatures with a different technique. The activation energies (here on a Kelvin scale) are remarkably similar for the three sulfides, considering that their relative errors are of a 10% magnitude, which indicates that the bonding strengths and the diffusion mechanisms are similar. The chemical diffusion coefficients which enter the empirical Fick`s diffusion laws that describe concentration changes, are of the order of exp(-8) to exp (-7) cm{sup 2}/s at room temperature. Such values bring the ion mobilities near values found for solid state `fast ion conductors`, used as electrolytes at elevated temperatures. 17  More>>
Authors:
Berger, R; Bucur, R V [1] 
  1. Uppsala Univ. (Sweden). Inst. of Chemistry
Publication Date:
Jan 01, 1996
Product Type:
Technical Report
Report Number:
SKI-R-96-3
Reference Number:
SCA: 360606; 540250; PA: AIX-27:028224; EDB-96:066257; NTS-96:017734; SN: 96001570103
Resource Relation:
Other Information: PBD: Jan 1996
Subject:
36 MATERIALS SCIENCE; 54 ENVIRONMENTAL SCIENCES; CHALCOPYRITE; DIFFUSION; COPPER SULFIDES; ION MOBILITY; POWDERS; SULFIDE MINERALS; SYNTHESIS
OSTI ID:
209499
Research Organizations:
Swedish Nuclear Power Inspectorate, Stockholm (Sweden)
Country of Origin:
Sweden
Language:
English
Other Identifying Numbers:
Other: ON: DE96619009; TRN: SE9600060028224
Availability:
INIS; OSTI as DE96619009
Submitting Site:
SWDN
Size:
36 p.
Announcement Date:

Citation Formats

Berger, R, and Bucur, R V. Diffusion in copper sulphides. An experimental study of chalcocite, chalcopyrite and bornite. Sweden: N. p., 1996. Web.
Berger, R, & Bucur, R V. Diffusion in copper sulphides. An experimental study of chalcocite, chalcopyrite and bornite. Sweden.
Berger, R, and Bucur, R V. 1996. "Diffusion in copper sulphides. An experimental study of chalcocite, chalcopyrite and bornite." Sweden.
@misc{etde_209499,
title = {Diffusion in copper sulphides. An experimental study of chalcocite, chalcopyrite and bornite}
author = {Berger, R, and Bucur, R V}
abstractNote = {Diffusion measurements on three copper-containing sulphides have been performed by an electrochemical potentiometric method. Chalcocite (Cu{sub 2}S), Chalcopyrite (CuFeS{sub 2}) and Bornite (Cu{sub 5}FeS{sub 4}) were synthesized and fully characterized by X-ray diffraction. The diffusivities were measured on compacted powders yielding both the chemical and the component diffusion coefficients in the temperature range 5-50 C. The chemical diffusion coefficients found were: for Chalcocite 38.7*exp (-5600/T), for Chalcopyrite 15.4*exp(-6000/T) and for Bornite 14.4*exp(-4900/T). The diffusion coefficient for Chalcocite is in good agreement with values found previously, and a reasonable agreement is also found for Chalcopyrite and Bornite when our data are compared with values acquired at much higher temperatures with a different technique. The activation energies (here on a Kelvin scale) are remarkably similar for the three sulfides, considering that their relative errors are of a 10% magnitude, which indicates that the bonding strengths and the diffusion mechanisms are similar. The chemical diffusion coefficients which enter the empirical Fick`s diffusion laws that describe concentration changes, are of the order of exp(-8) to exp (-7) cm{sup 2}/s at room temperature. Such values bring the ion mobilities near values found for solid state `fast ion conductors`, used as electrolytes at elevated temperatures. 17 refs, 8 figs, 5 tabs.}
place = {Sweden}
year = {1996}
month = {Jan}
}