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pcczhouwei鐵桿木蟲 (著名寫手)
Wolf
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[交流]
計(jì)算完后,CASTEP中出來的問題 已有3人參與
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問題1:Warning - trial step suggests complex energy landscape in which simple line minimization will fail. - This is usually an indication that the forces/streses are not accurate enough. Consider making the following changes: 1) Increase cutoff_energy or basis_precision 2) Reduce elec_energy_tol and/or elec_force_tol 3) Increase grid_scale 4) Increase fine_grid_scale - Proceeding with a bisection search to find root instead. 問題2:Warning - looks like this system is as converged as possible. Maybe your geometry convergence tolerances are too tight? 這里我先大家把我的數(shù)據(jù)說明下:物質(zhì)是LaFeO3,截?cái)嗄?50ev和K點(diǎn)3*3*1都是經(jīng)過收斂測試得來的,其它大部分都是默認(rèn),如果有具體想了解的可以再和我說。因?yàn)槲矣?jì)算出來的數(shù)據(jù)和文獻(xiàn)中的數(shù)據(jù)出入很大,應(yīng)該吸附的位置不吸附,而且吸附能出入也很大,有朋友說這個(gè)物質(zhì)應(yīng)該考慮其鐵磁性,我也試了下,鐵磁性不行,或許是反鐵磁性的原因,目前在嘗試是不是反鐵磁性的影響。上面2個(gè)問題是分別選取不同的CASTEP中的問題,這些都是未考慮鐵磁性的,就改變了截?cái)嗄芎蚄點(diǎn)。希望曾經(jīng)遇到過類似問題,或懂得如何解決問題的朋友,幫幫忙,謝謝! |

鐵桿木蟲 (著名寫手)
Wolf

新蟲 (初入文壇)
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