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[求助]
castep 計(jì)算properties的問題(請大家?guī)兔α,感激不盡)
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想問問大家, 問題一: 我到底是在優(yōu)化的時(shí)候同時(shí)選上態(tài)密度和能帶結(jié)構(gòu)同時(shí)計(jì)算, 還是優(yōu)化完以用有優(yōu)化好的結(jié)構(gòu)task選energy,選項(xiàng)卡properties勾選態(tài)密度和帶結(jié)構(gòu)計(jì)算? 問題二: 用task選energy,然后選項(xiàng)卡property選態(tài)密度和帶結(jié)構(gòu)計(jì)算 和在task里選properties,然后再properties里勾選態(tài)密度和帶結(jié)構(gòu)。 到底這兩個(gè)properties有什么區(qū)別啊,好像兩種計(jì)算出來的結(jié)果不一樣?有什么不一樣呢? 我用兩種計(jì)算了同一結(jié)構(gòu),結(jié)果卻出現(xiàn)了問題,為什么都出現(xiàn)問題了,第一個(gè)貌似可以改,可以解決,但第二個(gè)還像是說電腦運(yùn)行不起來,承受不了,這是為什么,我該怎么處理。 非常感謝大家。! 1.用task選energy,然后選項(xiàng)卡property選態(tài)密度和帶結(jié)構(gòu)計(jì)算的,計(jì)算完成后任務(wù)失敗了,在castep文件下出現(xiàn)了如下warning, Warning: There are no empty bands for at least one kpoint and spin; this may slow the convergence and/or lead to an inaccurate groundstate. If this warning persists, you should consider increasing nextra_bands and/or reducing smearing_width in the param file. Recommend using nextra_bands of 7 to 15. 而且我查了param文件,里面nextra_bands為4,但是不知道這個(gè)值在哪里改 沒有找到,在哪里可以改呢? smearing_width我已經(jīng)是0.01了是最小,我在electronic-more-SCF選項(xiàng)下改的,如果我改成0.005他就會(huì)提示我:value is invalid for property smearing(range is 0.01----10.0),這個(gè)是已經(jīng)改不了了啊。 請大家?guī)兔匆幌?br /> 2.我也試了在task里選properties,然后再properties里勾選態(tài)密度和帶結(jié)構(gòu),但是總是失敗,出現(xiàn)如下提醒: The memory required for this calculation exceeds machine capacity. Unable to continue. Run will be ABORTED. Suggestions: Check the run setup is reasonable; in particular cell dimensions, number of atoms, plane wave cutoff all affect memory consumption. Investigate the parameters "opt_strategy"/"opt_strategy_bias" and "page_wvfns" which may be used to reduce memory requirements. If the calculation is being run on a distributed memory computer consider increasing the number of processors. It may be necessary to run this calculation on another computer with more RAM or upgrade the physical RAM on the current system. [ Last edited by 菲頂頂 on 2012-10-30 at 16:07 ] |
計(jì)算材料帖子整理 |
木蟲 (正式寫手)
小書蟲愛吃糖

鐵桿木蟲 (知名作家)
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