翻訳と辞書 Words near each other ・ Cerium ・ Cerium acetylacetonate ・ Cerium anomaly ・ Cerium hexaboride ・ Cerium hydroxide ・ Cerium nitrate ・ Cerium oxalate ・ Cerium oxide ・ Cerium uranium blue ・ Cerium(III) bromide ・ Cerium(III) chloride ・ Cerium(III) hydroxide ・ Cerium(III) methanesulfonate ・ Cerium(III) oxide ・ Cerium(III) sulfate ・ Cerium(IV) oxide ・ Cerium(IV) oxide–cerium(III) oxide cycle ・ Cerium(IV) sulfate ・ Cerivastatin ・ Ceriwis ・ Ceriyamundam ・ Cerizay ・ Cerizay Officer Center ・ Cerizy ・ Cerić ・ Cerić (surname) ・ Cerići ・ Ceriņi ・ Cerja ・ Cerje 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 Cerium(IV) oxide ： ウィキペディア英語版 Cerium(IV) oxide |Section2= |Section3= |Section7= |Section8= }} Cerium(IV) oxide, also known as ceric oxide, ceria, cerium oxide or cerium dioxide, is an oxide of the rare earth metal cerium. It is a pale yellow-white powder with the chemical formula CeO2. Cerium(IV) oxide is formed by the calcination of cerium oxalate or cerium hydroxide. Powdered ceria is slightly hygroscopic and will also absorb a small amount of carbon dioxide from the atmosphere.〔Robert David Green (Carbon dioxide reduction on gadolinium-doped ceria cathodes ). PhD Thesis. Department of Chemical Engineering, CASE Western Reserve University. May, 2009〕 Cerium also forms cerium(III) oxide, , which is an unstable compound that will oxidize to cerium (IV) oxide under standard conditions for temperature and pressure.〔(Thermodynamic data )〕 == Structure == Cerium oxide has the fluorite structure, space group Fm3m, #225 containing 8 coordinate Ce4+ and 4 coordinate O2− . At high temperatures it can be reduced to a non-stoichiometric, anion deficient form that retains the fluorite lattice, CeO(2-x) where 0 < $x$ < 0.28.〔Defects and Defect Processes in Nonmetallic Solids By William Hayes, A. M. Stoneham Courier Dover Publications, 2004〕 The value of $x$ depends on both the temperature and the oxygen partial pressure. The equation :$\backslash Bigg(\; \backslash frac\; \backslash Bigg)\; =\; 106000\backslash ,\backslash ,\; ()\; \backslash times\; P\_^\; \backslash exp\backslash Bigg(\; \backslash frac"\; TITLE="\backslash mathrm^">)\}\; \backslash Bigg)$ has been shown to predict the equilibrium non stoichiometry $x$ over a wide range of oxygen partial pressures (103 - 10−4 Pa) and temperatures (1000-1900 °C). The non stoichiometric form has a blue to black color, and exhibits both ionic and electronic conduction with ionic being the most significant at temperatures > 500 °C. 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「Cerium(IV) oxide」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.