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4Â¥2010-05-28 16:45:40
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xingkai-xingkai(½ð±Ò+49):лл 2010-05-28 12:50:18
zzy870720z(½ð±Ò+2):ллÌṩ 2010-05-28 17:59:34
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Originally posted by xingkai-xingkai at 2010-05-27 16:30:04:
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*data for   ICSD #65701
Coll Code   65701
Rec  Date   1990/06/08
Mod  Date   2005/10/01
Chem Name   Molybdenum Carbide (2/1) - Zeta
Structured  Mo2 C
Sum         C1 Mo2
ANX         NO2
D(calc)     9.11
Title       Neutron powder diffraction studies of transition metal hemicarbides
            M2 C1-x - II. In situ high temperature study on W2 C1-x and Mo2 C1-x
Author(s)   Epicier, T.;Dubois, J.;Esnouf, C.;Fantozzi, G.;Convert, P.
Reference   Acta Metallurgica
            (1988), 36, 1903-1921
            Transactions of the Metallurgical Society of Aime
            (1967), 239, 1247-1267
            Golden Book of Phase Transitions, Wroclaw
            (2002), 1, 1-123
Unit Cell   4.735 6.025 5.21 90. 90. 90.
Vol         148.63
Z           4
Space Group P b c n
SG Number   60
Cryst Sys   orthorhombic
Pearson     oP12
Wyckoff     d c
R Value     .05
Red Cell    P  4.735 5.21 6.025 89.999 89.999 90 148.633
Trans Red   1.000 0.000 0.000 / 0.000 0.000 1.000 / 0.000 -1.000 0.000
Comments    Cell from 2nd reference: 4.733, 6.042, 5.202, m.p.=2795 K
            (congruent)
            Stable up to 1493 K (3rd ref., Tomaszewski), above 1713 K:
            P3121
            Neutron diffraction (powder)
            The structure has been assigned a PDF number (calculated
            powder diffraction data): 01-079-0744
            The structure has been assigned a PDF number (experimental
            powder diffraction data): 31-871
            Structure type : Fe2N-zeta
Atom  #   OX   SITE      x           y           z           SOF      H        ITF(B)   
Mo   1  +0    8 d   0.245(5)    0.125(5)    0.083(6)       1.         0         0.56(1)
C    1  +0    4 c   0           0.375(2)    0.25           1.         0       0.555(10)
*end for    ICSD #65701

MoCµÄ½á¹¹£¨Á¢·½£¬ÓÐÎÄÏ׳ƽṹÊÇÁù·½£ºMonatshefte fuer Chemie (-108,1977) (1976), 107, 1167-1176       Nature (London)   (1961), 191, 1194-1194£©£º
ÒýÓûØÌû:
*data for   ICSD #77157
Coll Code   77157
Rec  Date   2003/04/01
Chem Name   Molybdenum Carbide (1/1)
Structured  Mo C
Sum         C1 Mo1
ANX         AX
D(calc)     9.19
Title       Formation of cubic solid solutions in the Mo-Nb-C and Mo-Ta-C systems
            by the carbonization of oxides in the plasma arc
Author(s)   Matsumoto, O.;Yaguchi, Y.;Shiota, Y.;Kanzaki, Y.
Reference   High Temperature Science
            (1983), 16, 243-250
            High Temperature Science
            (1981), 14, 161-169
            Poroshkovaya Metallurgiya
            (1964), 3, 460-463
Unit Cell   4.273 4.273 4.273 90. 90. 90.
Vol         78.02
Z           4
Space Group F m -3 m
SG Number   225
Cryst Sys   cubic
Pearson     cF8
Wyckoff     b a
Red Cell    F  3.021 3.021 3.021 60 60 60 19.505
Trans Red   0.500 0.500 0.000 / 0.000 0.500 0.500 / 0.500 0.000 0.500
Comments    Cell from 2nd reference: 4.26, from 3rd ref.: 4.28
            The structure has been assigned a PDF number (calculated
            powder diffraction data): 01-073-9798
            Structure type : NaCl
            X-ray diffraction (powder)
            No R value given in the paper.
            At least one temperature factor missing in the paper.
Atom  #   OX   SITE      x           y           z           SOF      H
Mo   1  +4    4 a   0           0           0              1.         0   
C    1  -4    4 b   0.5         0.5         0.5            1.         0   
*end for    ICSD #77157

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cenwanglai(½ð±Ò+1):лл²ÎÓëÌÖÂÛ 2010-05-30 22:18:57
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