钨W原子序数74,化学性能较稳定,常温下不受空气侵 蚀。1781年,瑞典的舍勒 (Scheele)从一种白色矿石(钨矿)中发现钨酸。1783年,西班牙的德鲁亚尔兄弟(de Elhuyar)从瑞典的一 种钨锰铁矿中也得到了钨酸,并用碳还原,制得其单 质。因钨的相对密度很大,故命名为“Tungsten”,其瑞 典原意是“重石”的意思。地壳中的丰度为0.001%。 重要的矿物有黑钨矿(Fe,Mn)WO4、钨铁矿(FeWO4) 和白钨矿(CaWO4)等。用于电气工业、电子设备及放 射性屏蔽。也用作制钨丝、高速切削钢和特种钢。钨W的同位素通常有钨W-180,钨W-182,钨W-183,钨W-184,钨W-186。
Nominal mass | Accurate mass | % Natural abundance | Chemical form | Enrichment available % |
180W | 179.946701 (5) | 0.12 (1) | oxide, metal | 5 - 95+ |
182W | 181.948202 (3) | 26.50 (16) | oxide, metal | 81 - 99+ |
183W | 182.950220 (3) | 14.31 (4) | metal | 96+ |
184 W | 183.950928 (3) | 30.64 (2) | oxide, metal, fluoride | 85 - 96+ |
186 W | 185.954357 (4) | 28.43 (19) | oxide, metal, fluoride | 95 - 99+ |
Tungsten Isotopes are used in several applications. W-180 is used for the production of the therapeutic radioisotope W-181. W-186 is used for the production of W-188 which is used in so-called Tungsten-Rhenium generators. The W-188 daughter Re-188 is “milked” from there generators and used as a therapeutic radioisotope. W-184 has been used to study the elastic and inelastic scattering of heavy ions.
武汉易司拓普能提供丰度99.9%以及更高丰度范围内各种纯度规格的钨W-180,钨W-182,钨W-183,钨W-184,钨W-186的钨W同位素产品。