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heavy rare earth oxide

definition As defined by IUPAC, a rare earth element (REE) or rare earth metal is one of a set of seventeen chemical elements in the periodic table, specifically the fifteen lanthanides plus scandium and yttrium.[2] Scandium and yttrium are considered rare earth elements because they tend to occur in the same ore deposits as the lanthanides and exhibit similar chemical properties. more like this
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HREO more like this
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narrower heavy-rare-earth-oxide original
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is primary topic of heavy-rare-earth-oxide