Jimmy G on sun 23 sep 01
A glaze recipe calls for Nickel carbonate. I happen to have Nickel
OXIDE on hand.
I'll try my tests using the same proportions of the oxide, but is there
any rule of thumb as to the use of a carbonate vs. an oxide (Or vice
versa)?
Wade Blocker on sun 23 sep 01
Jimmy,
There seems to be a lack of information regarding substituting the
carbonate for the oxide in a glaze. Tom Buck would have the answer for you.
Tom.Buck@hwcn.org
The chemical formula for Nickel oxide is NiO, the maximum addition is
suggested as 3%
" " Nickel carbonate NiCo3
Both forms are toxic. Nickel is used to tone down intense colors, and
promote crystalline formation. Mia in ABQ
David Hewitt on mon 24 sep 01
Jimmy,
I would suggest that you only put in 0.6 by weight of nickel oxide in
place of a recipe calling for nickel carbonate.
This kind of substitution is quite easy to calculate. All you need is
the atomic weights of the individual elements.
Ni = 58.7
O = 16.0
C = 12.0
>From this calculate the Molecular Weights.
NiO = 58.7 + 16.0 = 74.7
NiCO3 = 58.7 + 12 + (16 * 3) = 118.7
Each oxide has only one mol. Of NiO, so to put the same amount of Ni in
your glaze you will need less NiO than NiCO3 by weight in the ratio of
74.7/118.7 = 0.63
David
In message , Jimmy G writes
>A glaze recipe calls for Nickel carbonate. I happen to have Nickel
>OXIDE on hand.
>
>I'll try my tests using the same proportions of the oxide, but is there
>any rule of thumb as to the use of a carbonate vs. an oxide (Or vice
>versa)?
--
David Hewitt
David Hewitt Pottery ,
7 Fairfield Road, Caerleon, Newport,
South Wales, NP18 3DQ, UK. Tel:- +44 (0) 1633 420647
FAX:- +44 (0) 870 1617274
Web site http://www.dhpot.demon.co.uk
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