釓,化學元素也,符號為Gd,原子序六十四。屬鑭系元素、稀土金屬。色澤銀白,可展、可延。自然之中,惟氧化物是存。雖經分離,亦常雜有諸稀土元素。一八八零年,瑞士化學家馬里歷(Jean Charles de Marignac)始以光譜法探知其氧化物。越六年,法國化學家博勃瀚得其本體。
蓋冶煉鐵、鉻之際,釓摻雜其中,雖僅百一,亦大利其事,縱熾熱而難氧化也。釓亦攝取中子,無論本體、屬鹽皆然,遂用諸中子射線攝影、核反應堆。
有類諸稀土元素,釓三價鹽具熒光。其可溶於水者,劇毒於哺乳動物。而其螯化物,則毒性輕微,蓋其釓三價離子自腎而去,無以滲於臟腑之中。又以其具順磁性故,亦用諸核磁共振成像。
聲音動静,具錄於維基共享︰釓 |
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