Fred Paget on sun 1 mar 98
Europium oxide is a rare earth oxide and we used to use tiny amounts in
some fluorescent lamp phosphors.
Each of the several rare earths have different spectral properties but they
are pretty much alike chemically so I would suppose that you could
substitute a cheaper one like cerium in a glaze. Cerium is used in
cigarette lighter flints and cerium oxide is used for polishing glass. Karl
Platt would know if you could substitute, if he is still listening.
I think that purified Europium oxide would be very expensive. There is a
mixture of rare earths known as Misch metal and if left in air it changes
to a greenish grey powder which I assume is the oxide.
Fred Paget
> Europiom oxide
>I've had an inquiry about this substance. Has anyone heard of
>it? It was in reference to a ^6 ox red glaze.
>
>Many TIA
>
>sam - alias the cat lady
>Melbourne, Ontario
>SW Ontario CANADA
>http://www.geocities.com/paris/3110
From Fred Paget, Marin County, California
Karl P. Platt on thu 5 mar 98
Odd anyone would want to use Eu2O3 on a pot. It won't make any color you
can see -- unless your eyes are sensitive to a fantastically wide
spectrum.
It will, however, make a glaze that exhibits an amazing red/orange
flouresence under UV -- very cool effect, actually.
Cerium itself doesn't make color, but in the presence of other amenable
elements, like Ti, it does form things that make color -- Ce-Ti yellow,
for example.
Frankly, I was noodling out here and found Fred's note relative to the
rare earths. If the person who made the original inquiry would contact
me directly at the address above I'd be able to lend what assistance I
can.
Europium is very expensive, mind you. Last time I bought any was in 1990
or so and then it was something like $600/Lb and only available in
absurd purities.
We had fantasies once about tossing 5% into a melt anticipating that a
glint of the red could be revealed in sunlight -- pricey fantasy though.
I'll take the Carnaval instead
KPP
Jeremy M. Hellman on fri 6 mar 98
Interesting posts, Karl and Ditmar.
I'm not the original poster, but a friend gave me some rare earths she
obtained when one of the college depts (either bio or chem) was cleaning
out a cabinet. I have:
10 g Europium Oxide
Maybe 4-5 gms Samarium Oxide
approx 3 gm Indium Oxide
less than 1 gm Holmium Oxide
maybe 1/4 gm Scandium(III) oxide
All of the above perport to be 99.9% pure. And all are in bottles labeled
from Fairmount Chemical Co in Newark, NJ-- no zip code. Actually the
address says, Newark 5, NJ. I was going to write that the addresses make
them old, but of course they are extremely old!
The question is, how much to use in what kind of glaze, or whether to
brush a solution of any of the above on top of a white or clear glaze. I
usually fire ^6 ox porcelain or white stoneware.
Any thoughts anyone?
Bonnie Hellman in Pittsburgh, PA
>----------------------------Original message----------------------------
>Odd anyone would want to use Eu2O3 on a pot. It won't make any color you
>can see -- unless your eyes are sensitive to a fantastically wide
>spectrum.
>
>It will, however, make a glaze that exhibits an amazing red/orange
>flouresence under UV -- very cool effect, actually.
>
>Cerium itself doesn't make color, but in the presence of other amenable
>elements, like Ti, it does form things that make color -- Ce-Ti yellow,
>for example.
>
>Frankly, I was noodling out here and found Fred's note relative to the
>rare earths. If the person who made the original inquiry would contact
>me directly at the address above I'd be able to lend what assistance I
>can.
>
>Europium is very expensive, mind you. Last time I bought any was in 1990
>or so and then it was something like $600/Lb and only available in
>absurd purities.
>
>We had fantasies once about tossing 5% into a melt anticipating that a
>glint of the red could be revealed in sunlight -- pricey fantasy though.
>
>I'll take the Carnaval instead
>
>
>KPP
"Outside a dog, a book is a man's best friend. Inside a dog, it's too
dark to read" Groucho Marx
" " Harpo Marx
"Time flies like an arrow. Fruit flies like a banana" Att. to GM
"You can tune a piano but you cant tune a fish" Old Proverb
"By the time they had diminished from 50 to 8, the other dwarves
began to suspect 'Hungry' ..." -- Gary Larson, "The Far Side"
Frank Gaydos on tue 16 jan 01
I was contacting U.S. Pigments about their Gerstley Borate substitute =
and noticed Europium Oxide for sale.
I asked and was told "Europium Oxide is used to obtain Red color, Like =
Tomato red. "=20
Has anyone tried this yet?
Any details you could share?
TIA
Frank Gaydos
510 Gerritt St.
Philadelphia, Pa.
19147-5821 USA
"If you tell the truth, you don't have to remember anything." -- Mark =
Twain
http://home.earthlink.net/~fgaydos/
iandol on thu 18 jan 01
Hello Frank,
I would imagine this would be for the preparation of stains. Europium is =
a member of the Lanthanide Group of Elements which include Praesodymium, =
known for its use in very stable yellow stains.
You might check out with Masons to see what they are putting in their =
high temperature reds as an alternaive to Cadmium compounds. I use one =
and it retains its colour up to cone 9, even in reduction.
Best regards,
Ivor Lewis
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