(Science: chemistry, element) a rare metallic element associated with several other rare elements in the mineral gadolinite from Ytterby in Sweden. Its salts are rose-coloured and give characteristic spectra. Its sesquioxide is called erbia.
atomic weight: 165.9
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... are photosensitive glasses, which can be used to make fiber-optic strain, vibration, and temperature sensors. This group has produced a new glass (Erbium doped-lead-telluriumgermanate), which efficiently transforms invisible infrared to green light (usable for better disk memories), and a new crystal ...
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