|Stockholm—Carl Gustaf Mosander elements|
- Mosander found two impurities,
- both oxides,
- in his oxide of yttrium—one rosy
- and the other yellow.
- Having named yttrium from the first syllable
- of the village where it was found, Ytterby,
- he named the second after the second syllable, terb.
- And guess what he called the third one.
- Mosander named the rose oxide terbia,
- and the yellow oxide erbia,
- but Nils Johan Berlin couldn’t find the yellow oxide,
- so he named terbia erbia.
Atomic number 65
- Terbium phosphors give the green color
- in TV tubes, LCD screens, and “trichromatic” lighting.
- Shine an ultraviolet light on a euro banknote
- to cause green fluorescence from terbium.
- Terfenol-D, an alloy of terbium, dysprosium, and iron,
- expands and contracts in a magnetic field.
- Terbium, neodymium, and dysprosium alloys
- make strong magnets for electric motors and wind turbines.
- Terbium is used as a dopant in solid state devices
- and as a crystal stabilizer of high-temperature fuel cells.
Tweedledum and Tweedledee
- Terbium and erbium
- walked into a bar, where
- they met yttrium, and ordered
- oxygen-potassium cocktails.
- They asked for the senior discount.
- The bartender said OK, OK,
- but not for your friend yttrium;
- we know he’s only 39.