Given that we common folk usually encounter it in our
consumer electronic gear – especially hi-fi, does samarium represent the
audiophile side of the rare earth elements?
By: Ringo Bones
More famously known in those ultra-small yet very powerful
samarium-cobalt permanent magnets, the rare earth element samarium’s “global
strategic importance” seems to be just way greater to be left to geopolitical
tensions give that if Beijing blocks supplies destined to the rest of the
planet, it would be us civilians – especially the audiophile community – that
would be left high and dry. Given its importance in our modern way of life, it
would only be proper to know a bit more about this largely obscure member of
the rare earth kingdom.
Discovered by Lecoq de Boisbaudran in 1879 and further
chemically refined to be identified to be a member of the rare earth family by
Carl Auer von Welsbach back in 1885, the rare earth element samarium’s
contribution to human civilization would not be fully realized until almost 90
years after its discovery. The primary source of the rare earth element
samarium is the mineral samarskite – which is named after a 19th
Century Russian mining officer, Colonel V.E. Samarsky.
During the American science boom of the 1960s, samarium was
often experimented in laser applications. Calcium chloride crystals doped with
samarium have been employed in laser devices for producing beams of light
intense enough to burn metal or bounce off the moon. Its more widespread applications
in the civilian consumer electronics market now includes those small but
powerful samarium-cobalt magnets used in hi-fi headphone units and the small
electric motors used in almost everything from disc drives in CD and DVD
players and the memory drives and cooling fans in personal computers and
laptops. Samarium-cobalt magnets are also extensively used in the actuators of
unmanned drones. As a scientific curiosity, the isotope samarium-152 is the
only alpha particle emitting radioactive element known to occur naturally among
the elements lighter than bismuth. Samarium-152 has a half-life of 1-trillion
years.
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