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Atomic Number:62Atomic Symbol : SmAtomic Weight:150.36
disappear Point:1,965 F ( 1,074 C)Boiling Point:3,261 F ( 1,794 coulomb )
Two grams of ultrapure sublimated samarium, about 0.8 by 1.5 cm.
parole beginning : make for the mineral samarskite , which was nominate in honor of a Russian mine official , Col . Samarski .
uncovering : In 1879 , French pill roller Paul Émile Lecoq de Boisbaudran discovered the element spectroscopically by its penetrative immersion lines in samarskite .
Properties of samarium
Samarium , part of thelanthanide group of elements , is fairly stable in air and has a burnished silver luster . Three quartz modifications of the alloy exist , with transformations at 734 and 922 C ( 1,353 and 1,692 F ) . [ SeePeriodic Table of the Elements ]
The alloy ignites in melodic phrase at about 150 C ( 302 F ) . The sulphide has good thermoelectric efficiencies up to 1,100 C ( 2,012 F ) and surpassing stableness at high temperatures . There is scant data point about the perniciousness of the element so it should be handed carefully .
source of atomic number 62
Samarium is regain along with otherrare earth elementsin many mineral , include monazite ( 2.8 percent ) and bastnasite , which are commercial sources . While samarium has not been keep apart in its pure form until lately , misch alloy containing about 1 percent of samarium alloy , has been used for a long time .
Solvent descent and ion - exchange and techniques have streamline the separation of the rare earths from one another and more recently , electrochemical dethronement , using an electrolytic solution of Li citrate and a hydrargyrum electrode , has been used . Reducing the oxide withlanthanumcan produce atomic number 62 metal .
Natural atomic number 62 is a potpourri of several isotopes , three of which are fluid with recollective half - lives and 21 isotopes of samarium subsist .
Uses of samarium
Samarium provides C - arc lighting for the motion moving picture industry . Samarium take shape a compound withcobalt(SmCo5 ) , which is a powerful permanent attracter with the highest impedance to demagnetization of any known material .
The element used as a neutron absorber in atomic reactors and in infrared absorbing glass .
Compounds of the alloy act as sensitizer for phosphors excited in the infrared light ; the oxide exhibits catalytic property in the dehydration and dehydrogenation of ethyl alcohol .
Samarium oxide has been used in optical looking glass to absorb the infrared radiation . Samarium is used to dope calcium fluoride crystallization for utilization in visual optical maser or lasers .
( germ : Los Alamos National Laboratory )
