lanthanum
Noun
Meaning
A rare element of the group of the earth metals, allied to aluminium. It occurs in certain rare minerals, as cerite, gadolinite, orthite, etc., and was so named from the difficulty of separating it from cerium, didymium, and other rare elements with which it is usually associated. Atomic weight 138.5. Symbol La.
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Accordingly, lutetium rather than lanthanum was assigned to group 3 by some chemists in the 1920s and 30s.
A typical hybrid automobile battery for a Toyota Prius requires convert of lanthanum.
As engineers push the technology to increase fuel efficiency, twice that amount of lanthanum could be required per vehicle. citation citation * Hydrogen sponge alloys can contain lanthanum.
At 310 °C, lanthanum changes to a face-centered cubic structure, and at 865 °C, it changes to a body-centered cubic structure.
At the time of his formulation in 1871, Mendeleev believed that the elements were ordered by their atomic masses and placed lanthanum (element 57) in the spot below zirconium.
Due to high cost to extract the other lanthanides, a mischmetal with more than 50% of lanthanum is used instead of pure lanthanum.