A Ni NiO reference electrode of the third kind for molten fluorides
We have investigated an electrode of the third kind consisting of a nickel wire immersed in molten 2LiF BeF 2 containing excess NiO and BeO. A low concentration of dissolved Ni 2+ is produced by saturation of the melt with this oxide mixture, and this results in an electrode considerably less oxidiz...
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| Published in | Journal of inorganic & nuclear chemistry Vol. 34; no. 1; pp. 163 - 169 |
|---|---|
| Main Authors | , |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier B.V
1972
|
| Online Access | Get full text |
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| Summary: | We have investigated an electrode of the third kind consisting of a nickel wire immersed in molten 2LiF
BeF
2 containing excess NiO and BeO. A low concentration of dissolved Ni
2+ is produced by saturation of the melt with this oxide mixture, and this results in an electrode considerably less oxidizing than previously used Ni
2+|Ni
0 electrodes. The reliability of the NiO electrode, which may be represented as Be
2+|NiO, BeO, Ni
0, was established by potentiometric measurements
vs the Be
2+|Be
0 electrode in the cell
B
e
0
|
L
i
P
(
·
6
6
7
)
,
B
e
F
2
(
·
3
3
3
)
|
N
i
O
(
c
)
,
B
e
O
(
c
)
|
N
i
0
the assumed cell reaction being
B
e
0
(
c
)
+
N
i
O
(
c
)
⇌
B
e
O
(
c
)
+
N
i
0
(
c
)
The measured potentials were fitted by least squares to the expression
E
0 = A + BT
(with
B assigned from available entropy and heat capacity data), giving
E
0
=
1
·
9075
−
0
·
000056
T
(
T
=
780
−
980
°
K
)
The average deviation from this expression was 2·1 mV. The magnitude of
E
0 was in the range expected from available thermochemical values for BeO and NiO. |
|---|---|
| ISSN: | 0022-1902 1878-1225 |
| DOI: | 10.1016/0022-1902(72)80374-9 |