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20級(jí)研究生新蟲(chóng) (初入文壇)
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[求助]
Castep計(jì)算彈性常數(shù)出錯(cuò)
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大家好!我最近在用castep算晶體的彈性常數(shù),每次算到都中途出錯(cuò),看Cij的那個(gè)文件,就有以下的錯(cuò)誤,請(qǐng)問(wèn)怎么解決呢 +-----------+-----------------+-----------------+------------+-----+ <-- BFGS | Parameter | value | tolerance | units | OK? | <-- BFGS +-----------+-----------------+-----------------+------------+-----+ <-- BFGS | dE/ion | 1.019661E-005 | 2.000000E-006 | eV | No | <-- BFGS | |F|max | 2.825380E-002 | 6.000000E-003 | eV/A | No | <-- BFGS | |dR|max | 2.525920E-003 | 2.000000E-004 | A | No | <-- BFGS +-----------+-----------------+-----------------+------------+-----+ <-- BFGS BFGS: WARNING - Repeated consecutive reset of inverse Hessian BFGS: without satisfying convergence criteria which BFGS: looks like BFGS has run out of search directions. BFGS: WARNING - Lets try allowing some uphill steps and see if BFGS: we can get around this barrier. BFGS: - It is possible that the system may now converge to BFGS: a stationary point OTHER than the desired minimum. BFGS: Hint - this may be an indication that either: BFGS: a) you are using a poor guess at geom_frequency_est BFGS: and/or geom_modulus_est, or BFGS: b) you are using unrealistic convergence criteria. BFGS: Suggest therefore that you consider changing them! |
新蟲(chóng) (初入文壇)
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