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bluesky1803木蟲 (小有名氣)
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[求助]
材料計(jì)算中的不等價(jià)摻雜問題
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| 請問,哪位大俠曉得在材料計(jì)算中不等價(jià)摻雜應(yīng)如何考慮缺陷的存在,比如說La3+取代Ba2+,可能會(huì)產(chǎn)生陽離子空位等缺陷,大家在計(jì)算之前建模是否考慮了這一問題,請高人指點(diǎn)。 |
第一原理資料匯編 | 雜七雜八 | Photochemistry |

木蟲 (小有名氣)

榮譽(yù)版主 (著名寫手)
榮譽(yù)版主 (著名寫手)
榮譽(yù)版主 (著名寫手)
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以Ce3+摻雜LiBaF3為例 When Ce31 is incorporated in the LiBaF3 lattice, on a regular lattice site, it must be accompanied by a charge-compensating defect. We have considered as possible sites for Ce3+ in LiBaF3, the Li site and the Ba site, which leave, respectively, excess charges of 2+ and 1+ to be compensated. (1) Ce3+ on a Ba site, plus an O2+ ion at a nearest F site. (2) Ce3+ on a Ba site, plus an interstitial F- ion in the nearest neighbor region. (3) Ce3+ on a Ba site, plus a vacancy at a nearest Li site. (4) Ce3+ on a Ba site, plus a Li+ at a nearest Ba site. (5) A Ba vacancy compensating for two Ce3+ substitutions at Ba sites. (6) Ce3+ on a Li site, plus a vacancy at a nearest Ba site. 最終的計(jì)算結(jié)果是第(4)種方案合理 |
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