碲,化學元素也,符號為Te,原子序五十二。屬族十六、氧族,位列主族。色銀白,類金屬,易碎,稍有毒,幾稀。反應有類硒、硫。間以元素結晶存世。碲遍布太虛之中,罕見地球之上。地殼之中,碲之稀有,幾近於鉑,其原子序高故一也,其氫化物易於散逸、天地初開幾盡至宇宙故二也。
一七八二年,奧人賴興施泰因(Franz-Joseph Müller von Reichenstein)取之於碲、金雜礦。一七九八年,克拉普羅特(Martin Heinrich Klaproth)始名之。而自然之中,金多獨存,碲化金礦,實特例也。惟商業之中,碲多取於銅、鉛礦所雜。
世所產碲,多用諸銅、鋼合金,以便加工。半導體、碲鎘日能板等,亦其用也。生物本無碲,真菌或攝以代硫、硒,用諸胺基酸。人中碲毒,呼氣則有大蒜之味。
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