Sökning: (swepub) pers:(Johansson Börje) conttype:(refereed) pers:(Li Chun Mei) >
Physical mechanism ...
Physical mechanism of delta-delta '-epsilon phase stability in plutonium
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- Li, Chun-Mei (författare)
- Shenyang Normal Univ, Coll Phys Sci & Technol, Shenyang 110034, Peoples R China.;Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Peoples R China.
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- Johansson, Börje (författare)
- Uppsala universitet,KTH,Materialvetenskap,Uppsala Univ, Sweden,Materialteori,KTH Royal Inst Technol, Dept Mat Sci & Engn, S-10044 Stockholm, Sweden.; Dalian Univ Technol, Sch Phys & Optoelect Technol, Dalian 116024, Peoples R China.;Dalian Univ Technol, Coll Adv Sci & Technol, Dalian 116024, Peoples R China.
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- Vitos, Levente (författare)
- Uppsala universitet,KTH,Materialvetenskap,Uppsala Univ, Sweden,Materialteori,KTH Royal Inst Technol, Dept Mat Sci & Engn, S-10044 Stockholm, Sweden.;Wigner Res Ctr Phys, Res Inst Solid State Phys & Opt, POB 49, HU-1525 Budapest, Hungary.
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Shenyang Normal Univ, Coll Phys Sci & Technol, Shenyang 110034, Peoples R China;Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Peoples R China. Materialvetenskap (creator_code:org_t)
- 2017-07-17
- 2017
- Engelska.
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Ingår i: Scientific Reports. - : Nature Publishing Group. - 2045-2322. ; 7
- Relaterad länk:
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Abstract
Ämnesord
Stäng
- Based on first-principle calculations, we have systematically explored the nature of the elastic stability and the delta-delta'-epsilon phase transitions in pure Pu at high temperature. It is found that, both the electronphonon coupling and the spin fluctuation effects tend to decrease the tetragonal elastic constant (C') of delta-Pu, accounting for its anomalous softening at high temperature. The lattice thermal expansion together with the electron-phonon coupling can stiffen C' of epsilon-Pu, promoting its mechanical stability at high temperature. The delta-epsilon transition is calculated to take place around 750-800 K, and is dominated by the phonon vibration. The delta' intermediate phase is realized around 750 K mainly because of the thermal spin fluctuation.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
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