论文部分内容阅读
稀土,又称作镧系元素,它成为工业材料还不超过10年。当然,用混合稀土金属制造的打火石、铈抛光剂、作高折射低分散玻璃成份的氧化镧等在这之前就有了。但这些在包括钇在内的15个元素中(Pm除外)只不过占稀土的一部分,需要的部门是有限的,制造设备也比较简单,所以推动稀土工业发展的能力也不一定大。但是,大约10年前发现:加铕的钒酸钇作彩色电视的红色萤光体,具有十分优良的性能。彩色电视兴旺之际,使用量急剧地增加了。终于日本也能生产钇,现在稀工技术状况,
Rare earths, also known as lanthanides, have not yet become an industrial material for more than 10 years. Of course, flint made of mixed rare earth metals, cerium polish, lanthanum oxide, etc., which is a component of high refraction low dispersion glass, have been there before. However, among the 15 elements including Y, except for Pm, they account for only a part of the rare earths. The required departments are limited and the manufacturing equipment is relatively simple. Therefore, the ability to promote the development of rare earth industry is not necessarily large. However, about 10 years ago it was discovered that the addition of europium-doped yttrium vanadate as a red phosphor for color television displays very good performance. On the occasion of the boom in color television sets, usage has increased dramatically. Finally, Japan can produce yttrium, now the state of thin technology,