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Volumn 121, Issue 5, 2004, Pages 2289-2304

Structure prediction of high-pressure phases for alkali metal sulfides

Author keywords

[No Author keywords available]

Indexed keywords

ALGORITHMS; APPROXIMATION THEORY; DATA REDUCTION; HEURISTIC METHODS; OPTIMIZATION; PARAMETER ESTIMATION; PHASE TRANSITIONS; POTASSIUM; RUBIDIUM; SULFUR COMPOUNDS;

EID: 4043178974     PISSN: 00219606     EISSN: None     Source Type: Journal    
DOI: 10.1063/1.1766013     Document Type: Article
Times cited : (96)

References (79)
  • 1
    • 0013450667 scopus 로고    scopus 로고
    • Ultrahigh-pressure mineralogy: Physics and chemistry of the Earth's deep interior
    • edited by R. J. Hemley (The Mineralogical Society of America, Washington, DC)
    • Ultrahigh-Pressure Mineralogy: Physics and Chemistry of the Earth's Deep Interior, Reviews in Mineralogy, Vol. 37, edited by R. J. Hemley (The Mineralogical Society of America, Washington, DC, 1998).
    • (1998) Reviews in Mineralogy , vol.37
  • 19
    • 4043129216 scopus 로고
    • University of Bonn, Germany
    • R. Hundt, KPLOT, University of Bonn, Germany, 1979.
    • (1979) KPLOT
  • 22
    • 4043182975 scopus 로고    scopus 로고
    • note
    • The latest version of CRYSTAL currently being in the test phase contains a gradient subroutine for the atomic positions but only for fixed cell.
  • 24
    • 4043105177 scopus 로고    scopus 로고
    • note
    • j(V).
  • 25
    • 4043181575 scopus 로고    scopus 로고
    • note
    • -8 hartree.
  • 26
    • 4043058264 scopus 로고    scopus 로고
    • note
    • One commonly chosen solution to this problem (especially for heavy atoms such as Rb and Cs) is the attempt to summarize the effects of the core electrons in an effective averaged pseudopotential, which decreases the number of coefficients in the wave function (which still need to be optimized, of course). Note that pseudopotentials do not yield the true energy, and thus a direct comparison with energies based on AEBS calculations is not possible.
  • 28
    • 4043171591 scopus 로고    scopus 로고
    • note
    • Tests showed that this minor restriction did not significantly alter the values of the calculated parameters.
  • 31
    • 4043119340 scopus 로고    scopus 로고
    • See http://www.theochem.uni-stuttgart.de/
  • 32
    • 84856122390 scopus 로고    scopus 로고
    • 2S (M = Li, Na, Rb, Cs). A direct link to this document may be found in the online article's HTML reference section. The document may also be reached via the EPAPS homepage or from ftp.aip.org in the directory /epaps/. See the EPAPS homepage for more information
    • 2S (M = Li, Na, Rb, Cs). A direct link to this document may be found in the online article's HTML reference section. The document may also be reached via the EPAPS homepage (http://www.aip.org/pubservs/epaps.html) or from ftp.aip.org in the directory /epaps/. See the EPAPS homepage for more information.
    • EPAPS Document No.
  • 33
    • 4043126396 scopus 로고    scopus 로고
    • note
    • 2S - a = 6.12 Å, b=11.33Å, c = 13.51 Å; Rb(1a) - 0.125, 0.458, 0.125; S(1a) - 0.125, 0.125, 0.125; B = 17.5GPa].
  • 34
    • 4043065338 scopus 로고    scopus 로고
    • note
    • 2S in the supplementary material (Ref. 32).
  • 35
    • 4043097933 scopus 로고    scopus 로고
    • private communication
    • U. Wedig (private communication).
    • Wedig, U.1
  • 45
    • 4043102180 scopus 로고    scopus 로고
    • note
    • The other figures are available as supplementary material (Ref. 32).
  • 52
    • 4043129215 scopus 로고    scopus 로고
    • note
    • c ≈ 24 GPa.
  • 55
    • 4043161646 scopus 로고    scopus 로고
    • note
    • When decreasing the pressure below 20 GPa, the high-pressure modification remains until a transformation to the low-pressure phase occurs at about 8 GPa (Ref. 9).
  • 56
    • 4043095129 scopus 로고    scopus 로고
    • note
    • 2S RUN ID "I" and "II," respectively).
  • 57
    • 4043161647 scopus 로고    scopus 로고
    • note
    • 2 structure might nevertheless be stable at pressure somewhere between 5 and 15 GPa.
  • 60
    • 4043177321 scopus 로고    scopus 로고
    • note
    • One would expect HP and DFT calculations to yield larger and smaller volumes than the experimental one, respectively, but the differences are surprisingly large.
  • 61
    • 4043055451 scopus 로고
    • Ph.D. thesis, University of Torino
    • M. Prencipe, Ph.D. thesis, University of Torino, 1990.
    • (1990)
    • Prencipe, M.1
  • 63
    • 4043137585 scopus 로고    scopus 로고
    • note
    • The starting basis set was a Stuttgart-Dresden ECP28MBW quasirelativistic pseudopotential with a core charge of nine and equal number of the valence electrons (Ref. 51). As no projection operators for l equal three are available in CRYSTAL 98 the terms for l = 3 were taken as local and were subtracted from the terms for l = 0, 1, and 2. An appropriate (7s6p) basis set contracted to [5s4p] was taken from the Stuttgart-Dresden pseudopotential homepage (Ref. 31). For numerical reasons, the most diffuse s functions and the most diffuse p function were omitted, and in order to allow the polarization of the 5s5p shell, a single d function (α = 0.3044) was added.
  • 64
    • 4043105176 scopus 로고    scopus 로고
    • See http://www.mpi-stuttgart.mpg.de/jansen/
  • 65
    • 4043120727 scopus 로고    scopus 로고
    • note
    • We have performed full local optimizations with several combinations of basis sets [cf. supplementary data (Ref. 32)]. The results of all calculations are available as supplementary material (Ref. 32) or upon request (Ref. 64).
  • 67
    • 4043158777 scopus 로고    scopus 로고
    • note
    • Quasirelativistic pseudopotential; core charge is nine and is equal to the number of the valence electrons Ref. 51. An appropriate (7s6p) basis set contracted to [5s4p] was taken from the Stuttgart-Dresden pseudopotential homepage (Ref. 31). The most diffuse s functions and the most diffuse p function were omitted. To allow the polarization of the 5s5p shell, a single d function (α=0.35) was added (Refs. 35 and 66).
  • 69
    • 4043171590 scopus 로고    scopus 로고
    • note
    • However, the convergence was slower, and the fluctuation of the data points about the Birch-Murnaghan curve was larger, than for the pseudopotential calculations.
  • 71
    • 4043093776 scopus 로고    scopus 로고
    • note
    • The I-Rb2S type did not prove to be a thermodynamically stable phase in any of the sulfides.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.