EFFECT OF NONSTOICHIOMETRY ON THE ELECTROCHEMICAL-BEHAVIOR OF CHALCOCITE

被引：8

作者：

GOMEZ, H ^{[1
]}

VEDEL, J ^{[1
]}

CORDOVA, R ^{[1
]}

SCHREBLER, R ^{[1
]}

BASAEZ, L ^{[1
]}

机构：

[1] ECOLE NATL SUPER CHIM, ELECTROCHIM & CHIM ANALYT LAB, CNRS UNITE, F-75231 PARIS 05, FRANCE

来源：

JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 1995年 / 388卷 / 1-2期

关键词：

CHALCOCITE; VOLTAMMETRY; NONSTOICHIOMETRY;

D O I：

10.1016/0022-0728(95)03882-H

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The influence of non-stoichiometry in the voltammetric response of natural chalcocite electrodes in berate and berate ethyl xanthate solution has been investigated. Surface composition was controlled by short circuiting the mineral to a copper electrode for enough time to attain different non-stoichiometric ratios. Voltammograms recorded afterwards reveal different current contributions that can be correlated with a defined composition. Photovoltammetric curves also exhibit composition dependence allowing us thus to correlate semiconductor properties with copper sulphide composition. Non-stoichiometry also affects chemisorption of xanthate as well as the nature of the electro-oxidation products formed at more oxidizing potentials.

引用

页码：81 / 88

页数：8

共 15 条

[1]

BASAEZ L, IN PRESS

[2] STUDIES ON NONSTOICHIOMETRIC COPPER SULFIDES [J].

BRAGE, MC ;

LAMACHE, M ;

BAUER, D .

ELECTROCHIMICA ACTA, 1979, 24 (01) :25-30

[3]

ETIENNE AE, 1972, T IMM, V81, pC176

[4] APPLICATION OF REFLECTANCE SPECTROSCOPY TO A STUDY OF ANODIC-OXIDATION OF CUPROUS SULFIDE [J].

KOCH, DFA ;

MCINTYRE, RJ .

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1976, 71 (03) :285-296

[5] CYCLIC VOLTAMMETRY OF ETHYL XANTHATE ON A NATURAL COPPER SULFIDE ELECTRODE [J].

KOWAL, A ;

POMIANOW.A .

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1973, 46 (02) :411-420

[6] ELECTROCHEMICAL AND THERMODYNAMIC STUDIES ON SYSTEM COPPER-SULFUR AT TEMPERATURES T-15-90 DEGREES C [J].

MATHIEU, HJ ;

RICKERT, H .

ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-FRANKFURT, 1972, 79 (5-6) :315-&

[7] ELECTROCHEMISTRY OF THE CHALCOCITE XANTHATE SYSTEM [J].

ODELL, CS ;

WALKER, GW ;

RICHARDSON, PE .

JOURNAL OF APPLIED ELECTROCHEMISTRY, 1986, 16 (04) :544-554

[8] ELECTROCHEMICAL INVESTIGATION OF SYSTEM COPPER-SULFUR [J].

POTTER, RW .

ECONOMIC GEOLOGY, 1977, 72 (08) :1524-1542

[9]

PRITZKER MD, 1985, CAN METALL QUART, V24, P27

[10]

VEDEL J, 1992, NON-STOICHIOMETRY IN SEMICONDUCTORS, P3

← 1 2 →