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<CENTER><B>
<FONT SIZE=+2>Chemical Fact Sheet</FONT></B></CENTER>

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<CENTER><B>
<FONT SIZE=+3>Terbium</FONT></B></CENTER>

<CENTER><TABLE BORDER WIDTH="100%" >

<CAPTION>&nbsp;</CAPTION>

<TR>
<TH>Chemical Abstract Number (CAS #)</TH>

<TD><FONT SIZE=-1>7440-29-1</FONT>
</TD>
</TR>

<TR>
<TD>
<CENTER><B>Synonyms</B></CENTER>
</TD>

<TD><FONT SIZE=-1>Thorium-232</FONT></TD>
</TR>


<TR>
<TH>Analytical Methods</TH>

<TD><FONT SIZE=-1>200.8 - 6020</FONT></TD>
</TR>

<TR>
<TH>Atomic Symbol
</TH>

<TD><FONT SIZE=-1>Tb</FONT></TD>
</TR>

<TR>
<TD>
<CENTER><B>Synopsis from the<A HREF="http://www.crcpress.com">
 CRC Handbook of Chemistry and Physics 
92nd Edition 2011-2013</a></B></P></CENTER>

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<TD><FONT SIZE=-1>Terbium — (Ytterby, village in Sweden), Tb; at. wt. 158.92534(2);
at. no. 65; m.p. 1356 °C; b.p. 3230 °C; sp. gr. 8.230; valence 3,
4. Discovered by Mosander in 1843. Terbium is a member of
the lanthanide or “rare earth” group of elements. It is found
in cerite, gadolinite, and other minerals along with other rare
earths. It is recovered commercially from monazite in which
it is present to the extent of 0.03%, from xenotime, and from
euxenite, a complex oxide containing 1% or more of terbia.
Terbium has been isolated only in recent years with the development
of ion-exchange techniques for separating the rareearth
elements. As with other rare earths, it can be produced
by reducing the anhydrous chloride or fluoride with calcium
metal in a tantalum crucible. Calcium and tantalum impurities
can be removed by vacuum remelting. Other methods of
isolation are possible. Terbium is reasonably stable in air. It is
a silver-gray metal, and is malleable, ductile, and soft enough
to be cut with a knife. Two crystal modifications exist, with
a transformation temperature of 1289 °C. Forty-two isotopes
and isomers are recognized. The oxide is a chocolate or dark
maroon color. Sodium terbium borate is used as a laser material
and emits coherent light at 0.546 μm. Terbium is used
to dope calcium fluoride, calcium tungstate, and strontium
molybdate, used in solid-state devices. The oxide has potential
application as an activator for green phosphors used in
color TV tubes. It can be used with ZrO2 as a crystal stabilizer
of fuel cells that operate at elevated temperature. Few other
uses have been found. The element is priced at about $40/g
(99.9%). Little is known of the toxicity of terbium. It should be
handled with care as with other lanthanide elements.</FONT></TD>
</TR>

<TR>
<TD>
<CENTER><B>Molecular Weight</B></CENTER>
</TD>

<TD><FONT SIZE=-2>232.038</FONT></TD>
</TR>
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