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xiaoyaobeiji新蟲(chóng) (小有名氣)
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Abstract Experimental observations indicate that removing bridging oxygen atoms from the TiO2 rutile (110) surface produces a localised state approximately 0.7 eV below the conduction band. The corresponding excess electron density is thought to localise on the pair of Ti atoms neighbouring the vacancy; formally giving two Ti3+ sites. We consider the electronic structure and geometry of the oxygen deficient TiO2 rutile (110) surface using both gradient-corrected density functional theory (GGA DFT) and DFT corrected for on-site Coulomb interactions (GGA + U) to allow a direct comparison of the two methods. We show that GGA fails to predict the experimentally observed electronic structure, in agreement with previous uncorrected DFT calculations on this system. Introducing the +U term encourages localisation of the excess electronic charge, with the qualitative distribution depending on the value of U. For low values of U (64.0 eV) the charge localises in the sub-surface layers occupied in the GGA solution at arbitrary Ti sites, whereas higher values of U (P4.2 eV) predict strong localisation with the excess electronic charge mainly on the two Ti atoms neighbouring the vacancy. The precise charge distribution for these larger U values is found to differ from that predicted by previous hybrid-DFT calculations 幫助翻譯下摘要吧,自己翻譯的牛頭不對(duì)馬嘴,另外翻譯的大神有沒(méi)有這篇文章的完整翻譯,有的話提供下,不勝感激,文章題目: A DFT + U description of oxygen vacancies at the TiO2rutile (1 1 0) surface [ Last edited by xiaoyaobeiji on 2013-4-1 at 09:37 ] |

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快樂(lè)島、布吉島島主
新蟲(chóng) (小有名氣)

版主 (文壇精英)
米米
新蟲(chóng) (小有名氣)

木蟲(chóng) (小有名氣)
ttxd
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摘要yue 實(shí)驗(yàn)結(jié)果表明,從TiO2 rutile(110)表面去除橋氧原子產(chǎn)生一個(gè)比傳導(dǎo)帶低約0.7 eV的局域態(tài)。相應(yīng)的多余的電子密度被認(rèn)為定域在Ti原子對(duì)相鄰的空缺處,普遍認(rèn)為在兩個(gè)TI3 +位置。我們采用梯度校正的密度泛函理論(GGA DFT)和DFT及時(shí)庫(kù)侖相互作用校正(GGA + U)研究缺氧的TiO2 rutile(110)表面電子結(jié)構(gòu)和幾何構(gòu)型。DFT及時(shí)庫(kù)侖相互作用校正允許直接比較該兩種方法。我們表明GGA無(wú)法預(yù)測(cè)實(shí)驗(yàn)觀察到的電子結(jié)構(gòu),這與以前的未校正的DFT對(duì)該系統(tǒng)的計(jì)算吻合。引入+ U項(xiàng)增加了多余電子的電荷的定域,定性分布取決于U的值。采用GGA方案,對(duì)于低U值(64 eV)電荷定域在位于任意Ti處的亞表面層,而對(duì)于較高的U值(P4.2 EV)多余電子的電荷被預(yù)測(cè)主要定域在兩個(gè)Ti原子周圍的空缺處。對(duì)于較大的U值,精確的電荷分布不同于先前雜化DFT計(jì)算預(yù)測(cè)。 |
木蟲(chóng) (小有名氣)
ttxd
木蟲(chóng) (小有名氣)
ttxd
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發(fā)現(xiàn)了一個(gè)翻譯不當(dāng)處,以以下翻譯為準(zhǔn) 實(shí)驗(yàn)結(jié)果表明,從TiO2 rutile(110)表面去除橋氧原子產(chǎn)生一個(gè)比傳導(dǎo)帶低約0.7 eV的局域態(tài)。相應(yīng)的多余的電子密度被認(rèn)為定域在Ti原子對(duì)相鄰的空缺處,普遍認(rèn)為在兩個(gè)TI3 +位置。我們采用梯度校正的密度泛函理論(GGA DFT)和DFT及時(shí)庫(kù)侖相互作用校正(GGA + U)研究缺氧的TiO2 rutile(110)表面電子結(jié)構(gòu)和幾何構(gòu)型,并直接比較這兩種方法。我們表明GGA無(wú)法預(yù)測(cè)實(shí)驗(yàn)觀察到的電子結(jié)構(gòu),這與以前的未校正的DFT對(duì)該系統(tǒng)的計(jì)算吻合。引入+ U項(xiàng)增加了多余電子的電荷的定域,定性分布取決于U的值。采用GGA方案,對(duì)于低U值(64 eV)電荷定域在位于任意Ti處的亞表面層,而對(duì)于較高的U值(P4.2 EV)多余電子的電荷被預(yù)測(cè)主要定域在兩個(gè)Ti原子周圍的空缺處。對(duì)于較大的U值,精確的電荷分布不同于先前雜化DFT計(jì)算預(yù)測(cè)。 |
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