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Electrochemical nucleation from molten salts—I. Diffusion controlled electrodeposition of silver from alkali molten nitrates
Hectmchimico Acre, 1976, Vol. 21. p, 1109. Pergamon Prws. Printed in Great Britain
CORRIGENDUM ELECTROCHEMICAL NUCLEATION FROM MOLTEN SALTS-l. DIFFUSION CONTROLLED ELECTRODEPOSITION OF SILVER FROM ALKALI MOLTEN NITRATES G. J. HILLS, D. J. SCH~M*
and J. THMPKI*
Department of Chemistry, The University, Southampton SO9 5NH, England
In a previous paper [l], we sought to demonstrate the validity of the complete current-time relationship for the diffusion controlled growth or hemispherical nuclei, ie equation (19) cf[l] 312 zFNoAM”2(2DC)3’2 I(L) = 1 - exp g tl’2. (19) 1/z P [ I Figure 22 which purported to confirm this equation has in fact the wrong ordinates and was, perversely, wrongly displaced along these wrong ordinates. We apologise for this mistake and the corrected figure is given below (Fig. 1). It follows that differentiation and rearrangement of equation (19) leads to
b
dI
(Y a
pA%3
b6 05 0.4 0.3 0.2
\ o-5
0.6
K= between
0.5
exP c+$
where
The corrected
0.7
.zFN~~M”~(~Dc)~‘” plf2
Fig. 1.
figure therefore illustrates the linear relation
that slope and intercept are identical as required by equation (19). From the observed slope the value of K is 1.03 x 10m6 coul see-‘I*. Inserting the values of the other quantities then leads to a value of
z/3
and
ex
In the original paper we also stated that the slope was that predicted by equation (19) but of course that would require an independent value of N,, the number of instantaneously formed nuclei. In this work no independent value of N0 was obtained and all that can be said is
N0 x
1.2 x 103
or 1.2 x lo5 cm’ which is a not unreasonable close to that observed in related studies [2].
value and
REFERENCES * I.N.T.I., Liberated 1235, Buenos Aires, Argentina. t Materials Department, R.A.E., Farnborough, Han&s, England.
1109
1. G. J. Hills, D. J. Schiffrin and J. Thompson, Electrackim. Acta, 19, 657 (1974). 2. G. A. Gunawardena and G. J. Hills. (To be published.)
CORRIGENDUM ELECTROCHEMICAL NUCLEATION FROM MOLTEN SALTS-l. DIFFUSION CONTROLLED ELECTRODEPOSITION OF SILVER FROM ALKALI MOLTEN NITRATES G. J. HILLS, D. J. SCH~M*
and J. THMPKI*
Department of Chemistry, The University, Southampton SO9 5NH, England
In a previous paper [l], we sought to demonstrate the validity of the complete current-time relationship for the diffusion controlled growth or hemispherical nuclei, ie equation (19) cf[l] 312 zFNoAM”2(2DC)3’2 I(L) = 1 - exp g tl’2. (19) 1/z P [ I Figure 22 which purported to confirm this equation has in fact the wrong ordinates and was, perversely, wrongly displaced along these wrong ordinates. We apologise for this mistake and the corrected figure is given below (Fig. 1). It follows that differentiation and rearrangement of equation (19) leads to
b
dI
(Y a
pA%3
b6 05 0.4 0.3 0.2
\ o-5
0.6
K= between
0.5
exP c+$
where
The corrected
0.7
.zFN~~M”~(~Dc)~‘” plf2
Fig. 1.
figure therefore illustrates the linear relation
that slope and intercept are identical as required by equation (19). From the observed slope the value of K is 1.03 x 10m6 coul see-‘I*. Inserting the values of the other quantities then leads to a value of
z/3
and
ex
In the original paper we also stated that the slope was that predicted by equation (19) but of course that would require an independent value of N,, the number of instantaneously formed nuclei. In this work no independent value of N0 was obtained and all that can be said is
N0 x
1.2 x 103
or 1.2 x lo5 cm’ which is a not unreasonable close to that observed in related studies [2].
value and
REFERENCES * I.N.T.I., Liberated 1235, Buenos Aires, Argentina. t Materials Department, R.A.E., Farnborough, Han&s, England.
1109
1. G. J. Hills, D. J. Schiffrin and J. Thompson, Electrackim. Acta, 19, 657 (1974). 2. G. A. Gunawardena and G. J. Hills. (To be published.)