翻訳と辞書 Words near each other ・ Hafner A.R.III Gyroplane ・ Hafner Manufacturing Company ・ Hafner Rotabuggy ・ Hafner Rotachute ・ Hafnerbach ・ Hafnersee ・ Hafner–Sarnak–McCurley constant ・ Hafnia ・ Hafnia (bacterium) ・ Hafnia Chamber Orchestra ・ Hafnia FC ・ Hafnia Hodierna ・ Hafning bei Trofaiach ・ Hafniomonas ・ Hafnir ・ Hafnium ・ Hafnium acetylacetonate ・ Hafnium controversy ・ Hafnium diboride ・ Hafnium tetrabromide ・ Hafnium tetrachloride ・ Hafnium tetrafluoride ・ Hafnium tetraiodide ・ Hafnium(IV) carbide ・ Hafnium(IV) oxide ・ Hafnium(IV) silicate ・ Hafnon ・ Hafod ・ Hafod Copperworks ・ Hafod Elwy Moor National Nature Reserve Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Hafnium ： ウィキペディア英語版 Hafnium Hafnium is a chemical element with symbol Hf and atomic number 72. A lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in zirconium minerals. Its existence was predicted by Dmitri Mendeleev in 1869, though hafnium was not identified until 1923, making it the penultimate stable element to be discovered (rhenium was identified two years later). Hafnium is named after ''Hafnia'', the Latin name for Copenhagen, where it was discovered.〔Knapp, Brian. Francium to Polonium. Atlantic Europe Publishing Company, 2002, p. 10.〕 Hafnium is used in filaments and electrodes. Some semiconductor fabrication processes use its oxide for integrated circuits at 45 nm and smaller feature lengths. Some superalloys used for special applications contain hafnium in combination with niobium, titanium, or tungsten. Hafnium's large neutron capture cross-section makes it a good material for neutron absorption in control rods in nuclear power plants, but at the same time requires that it be removed from the neutron-transparent corrosion-resistant zirconium alloys used in nuclear reactors. ==Characteristics== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hafnium」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.