mt gox买比特币|比特币为什么涨那么凶

Tel:086-731-28410199 
Fax:086-731-28415766

Janice: 15873392789

Email : [email protected]
Address:No.5 Building, No.581 Heilong
Jiang Road, Li Yu Industrial Park, Tian
Yuan District, Zhuzhou, Hunan, P.R. China.

Your present location:indexNewsIndustry News > The knowledge of niobium
Detail

The knowledge of niobium

Writer:RitaSource:來自網絡 Date:2012-9-2 14:45
Niobium is a refractory rare metal. Its color is steel-grey and it has the excellent characteristic for big specific gravity (8.6g/cm3), high melting point (2467℃), high boiling point (4740℃), high intensity, fatigue resistance, metamorphose resistance, corrosion resistance, thermal conductivity, superconductivity, unipolar electric conductivity and absorbing gas etc. Niobium and tantalum belong to the same group of the periodic table, they have almost identical chemical properties and symbiose in the niobate and tantalate mineral. The chemists discovered the niobium element and tantalum element in the niobite-tantalite serial minerals at the beginning of 19th century. In 1801, the English chemist Charles Hatchett discovered a new element when he analyzed mineral, he called the element columbium and the mineral was also named after columbium. In 1844, the German chemist Heinrich Rose announced that he discovered a ‘new’ element, the element has the similar chemical properties with tantalum and is associated with tantalum in nature. Because the tantalum was named according to the personality of the Greek mythology: Tantalus, the ‘new’ element was named after Niobium according to Tantalus’ daughter: Niobe. In 1866, people made sure that columbite and niobium is the same element, so for a long time, the same element had two different name, the American called it columbium with the symbol Cb and the European called it niobium with the symbol Nb. It is not until 1951 that the International Union of Pure and Applied Chemistry (IUPAC) officially adopted ‘niobium’ as the name of the element. But some countries still called columbium, for example, we could find Cb in some American chemical books. Niobium has a number of important uses for its excellent properties like good corrosion resistance, good cold-workability and good film oxide electric properties, etc. Niobium has the ability of grain refining in steel, it is widely applied to steel industry, electronic industry, spaceflight and aviation, atomic energy, ocean exploitation etc. and is used as alloy steel additive, superconductor material, high-temperature alloy, single crystal oxide, ceramic capacitor etc. Tantalum and niobium symbiose closely in nature, they have many similar characteristic like physical, chemical, geochemical and mineralogical etc., so they often occur in the same mineral. Minerals that contain niobium often also contain tantalum, they are distinguished just by primary and secondary element. Some mineral form complete isomorphic serial mineral, such as niobite-tantalite serial mineral: Ta2O5<15% calls niobite, Nb2O5<10% calls tantalite, Nb2O5>Ta2O5 calls tantalite-niobite, Ta2O5>Nb2O5 calls niobite-tantalite

Previous post:TIG 焊接 鎢電極

Next post:About tungsten

TypeInfo: Industry News

Keywords for the information:

Home  |  About us  |  News  |  Products  |  Quality assurance  |  Sales and Service   |  HR  |  Contact us
Webpage Copyright www.epvl.icu  Powered by www.300.cn  | 湘11005657號  |  Manager

mt gox买比特币 pk计算方式 福彩3的字图迷总汇牛材网 篮球胜分差是什么意思 时时彩1990注册平台 快速时时秘籍 我要31选七走势图 北京pk直播视频 安徽省体彩中心电话 熊猫麻将 海南环岛自行车赛彩票 22选五走势图中原风采 全天幸运飞艇计划五码二期 海南环岛赛开奖结果 天津时时走势图上银狐网 极速时时在哪里开的 3d和值尾振幅走势图彩经网