terbium
Noun
Meaning
A rare metallic element, of uncertain identification, supposed to exist in certain minerals, as gadolinite and samarskite, with other rare ytterbium earth. Symbol Tr or Tb. Atomic weight 150.
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It is now thought that workers using double sodium or potassium sulfates to remove ceria from yttria inadvertently lost the terbium into the ceria-containing precipitate.
Small amounts of terbium occur in bastnäsite and monazite; when these are processed by solvent extraction to recover the valuable heavy lanthanides as samarium europium gadolinium concentrate, terbium is recovered therein.
Sodium terbium borate is used in solid state devices.
Terfenol-D is a terbium alloy that expands or contracts in the presence of a magnetic field.
The brilliant fluorescence allows terbium to be used as a probe in biochemistry, where it somewhat resembles calcium in its behavior.
The chromatographic separation behavior was then unknown for the element 97, but was anticipated by analogy with terbium (see elution curves).