Institute of Experimental Mineralogy
                 Russian Academy of Sciences
     -------------------------------------------------
           142432, Chernogolovka, Moscow district
             A.V. Chichagov  +7(496)52-22320

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          ***      W W W - X R A Y P O L       ***
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ARGYRODITE

5, gamma, analogue, at 353'C

Cu(7)PSe(6)


Cubic  F 4(-)3m  Z = 4

R =0.0201          NR =368

26 .6 .1900

Ref.Str.:

         E. Gaudin, F. Boucher, V. Petricek, F. Taulelle and M. Evain (2000)

         * Acta Cryst., B56, 402-408

Reserv:

         The argyrodite-type ionic conductors.  N.A.D.

                   Initial data from BDM-file 

   Lattice parameters (cub. angs.,degr.):

             a =  10.113    alpha =   90.0 
             b =  10.113    beta  =   90.0 
             c =  10.113    gamma =   90.0 

    Unit cell volume (cub. angs.) =  1034.28

    Molar volume ( cub.cm/mol.) =   155.75

  Co-ordinates, thermal parameters, occupation for atomic positions:

NoP   x/a     y/b     z/c    B(j)   atom  / occupation

   1 0.75    0.75    0.75     0.01   P     = 1.00
   2 0.8758  0.8758  0.8758   0.02   Se    = 1.00
   3 0.25    0.25    0.25     0.03   Se    = 1.00
   4 0.5     0.5     0.5      0.03   Se    = 1.00
   5 0.0787  0.0787  0.2673   0.05   Cu    = 0.31, Cu    = 0.0 
   6 0.016   0.016   0.2757   0.07   Cu    = 0.18, Cu    = 0.0 
   7 0.1286  0.1286  0.3714   0.24   Cu    = 0.27, Cu    = 0.0 


  Co-ordinates for all atomic positions :

   No       NoP      x/a        y/b       z/c 

     1       1     0.75       0.75       0.75  
     2       2     0.8758     0.8758     0.8758
     3       3     0.25       0.25       0.25  
     4       4     0.5        0.5        0.5   
     5       5     0.0787     0.0787     0.2673
     6       6     0.016      0.016      0.2757
     7       7     0.1286     0.1286     0.3714
     8       1     0.75       0.25       0.25  
     9       2     0.6242     0.1242     0.3758
    10       3     0.25       0.75       0.75  
    11       4     0.0        0.5        0.0   
    12       5     0.4213     0.9213     0.7673
    13       6     0.484      0.984      0.7757
    14       7     0.3714     0.8714     0.8714
    15       1     0.25       0.25       0.75  
    16       2     0.1242     0.3758     0.6242
    17       3     0.75       0.75       0.25  
    18       4     0.5        0.0        0.0   
    19       5     0.9213     0.5787     0.2327
    20       6     0.984      0.516      0.2243
    21       7     0.8714     0.6286     0.1286
    22       1     0.25       0.75       0.25  
    23       2     0.3758     0.6242     0.1242
    24       3     0.75       0.25       0.75  
    25       4     0.0        0.0        0.5   
    26       5     0.5787     0.4213     0.7327
    27       6     0.516      0.484      0.7243
    28       7     0.6286     0.3714     0.6286
    29       2     0.1242     0.6242     0.3758
    30       5     0.9213     0.4213     0.7673
    31       6     0.984      0.484      0.7757
    32       7     0.8714     0.3714     0.8714
    33       2     0.3758     0.1242     0.6242
    34       5     0.5787     0.9213     0.2327
    35       6     0.516      0.984      0.2243
    36       7     0.6286     0.8714     0.1286
    37       2     0.6242     0.3758     0.1242
    38       5     0.4213     0.5787     0.7327
    39       6     0.484      0.516      0.7243
    40       7     0.3714     0.6286     0.6286
    41       2     0.1242     0.1242     0.8758
    42       5     0.9213     0.9213     0.2673
    43       6     0.984      0.984      0.2757
    44       7     0.8714     0.8714     0.3714
    45       2     0.3758     0.8758     0.3758
    46       5     0.5787     0.0787     0.7673
    47       6     0.516      0.016      0.7757
    48       7     0.6286     0.1286     0.8714
    49       2     0.8758     0.6242     0.6242
    50       5     0.0787     0.4213     0.2327
    51       6     0.016      0.484      0.2243
    52       7     0.1286     0.3714     0.1286
    53       2     0.8758     0.3758     0.3758
    54       5     0.0787     0.5787     0.7673
    55       6     0.016      0.516      0.7757
    56       7     0.1286     0.6286     0.8714
    57       2     0.6242     0.8758     0.6242
    58       5     0.4213     0.0787     0.2327
    59       6     0.484      0.016      0.2243
    60       7     0.3714     0.1286     0.1286
    61       2     0.6242     0.6242     0.8758
    62       5     0.4213     0.4213     0.2673
    63       6     0.484      0.484      0.2757
    64       7     0.3714     0.3714     0.3714
    65       2     0.1242     0.8758     0.1242
    66       5     0.9213     0.0787     0.7327
    67       6     0.984      0.016      0.7243
    68       7     0.8714     0.1286     0.6286
    69       2     0.8758     0.1242     0.1242
    70       5     0.0787     0.9213     0.7327
    71       6     0.016      0.984      0.7243
    72       7     0.1286     0.8714     0.6286
    73       2     0.3758     0.3758     0.8758
    74       5     0.5787     0.5787     0.2673
    75       6     0.516      0.516      0.2757
    76       7     0.6286     0.6286     0.3714
    77       5     0.0787     0.2673     0.0787
    78       5     0.2673     0.0787     0.0787
    79       6     0.016      0.2757     0.016 
    80       6     0.2757     0.016      0.016 
    81       5     0.9213     0.7673     0.4213
    82       5     0.7673     0.4213     0.9213
    83       6     0.984      0.7757     0.484 
    84       6     0.7757     0.484      0.984 
    85       5     0.5787     0.2327     0.9213
    86       5     0.2327     0.9213     0.5787
    87       6     0.516      0.2243     0.984 
    88       6     0.2243     0.984      0.516 
    89       5     0.4213     0.7327     0.5787
    90       5     0.7327     0.5787     0.4213
    91       6     0.484      0.7243     0.516 
    92       6     0.7243     0.516      0.484 
    93       5     0.4213     0.7673     0.9213
    94       5     0.7673     0.9213     0.4213
    95       6     0.484      0.7757     0.984 
    96       6     0.7757     0.984      0.484 
    97       5     0.9213     0.2327     0.5787
    98       5     0.2327     0.5787     0.9213
    99       6     0.984      0.2243     0.516 
   100       6     0.2243     0.516      0.984 
   101       5     0.5787     0.7327     0.4213
   102       5     0.7327     0.4213     0.5787
   103       6     0.516      0.7243     0.484 
   104       6     0.7243     0.484      0.516 
   105       5     0.9213     0.2673     0.9213
   106       5     0.2673     0.9213     0.9213
   107       6     0.984      0.2757     0.984 
   108       6     0.2757     0.984      0.984 
   109       5     0.0787     0.7673     0.5787
   110       5     0.7673     0.5787     0.0787
   111       6     0.016      0.7757     0.516 
   112       6     0.7757     0.516      0.016 
   113       5     0.4213     0.2327     0.0787
   114       5     0.2327     0.0787     0.4213
   115       6     0.484      0.2243     0.016 
   116       6     0.2243     0.016      0.484 
   117       5     0.5787     0.7673     0.0787
   118       5     0.7673     0.0787     0.5787
   119       6     0.516      0.7757     0.016 
   120       6     0.7757     0.016      0.516 
   121       5     0.0787     0.2327     0.4213
   122       5     0.2327     0.4213     0.0787
   123       6     0.016      0.2243     0.484 
   124       6     0.2243     0.484      0.016 
   125       5     0.4213     0.2673     0.4213
   126       5     0.2673     0.4213     0.4213
   127       6     0.484      0.2757     0.484 
   128       6     0.2757     0.484      0.484 
   129       5     0.0787     0.7327     0.9213
   130       5     0.7327     0.9213     0.0787
   131       6     0.016      0.7243     0.984 
   132       6     0.7243     0.984      0.016 
   133       5     0.9213     0.7327     0.0787
   134       5     0.7327     0.0787     0.9213
   135       6     0.984      0.7243     0.016 
   136       6     0.7243     0.016      0.984 
   137       5     0.5787     0.2673     0.5787
   138       5     0.2673     0.5787     0.5787
   139       6     0.516      0.2757     0.516 
   140       6     0.2757     0.516      0.516 


X-ray density (g/cm cub.)   =      6.09

MU (1/cm) =     443.708    Mass attenuation coefficient (cm**2/g) =     72.806

 Selected interatomic distances (cation-anion,anion-anion):

 NoP    Atom              Rad.sph.      C.N.    Distance     NoP N.
                           (angs.)               (angs.)

    1    P                   2.916        4
                                                 2.2028       2
                                                 2.2028       2
                                                 2.2028       2
                                                 2.2028       2
    2    Se                  4.632       12
                                                 4.1903       3
                                                 4.195        4
                                                 4.1903       3
                                                 4.195        4
                                                 4.1903       3
                                                 4.195        4
                                                 3.5537       2
                                                 3.5972       2
                                                 3.5972       2
                                                 3.5972       2
                                                 3.5537       2
                                                 3.5537       2
    3    Se                  4.632       16
                                                 4.3791       4
                                                 4.1903       2
                                                 4.3791       4
                                                 4.1903       2
                                                 4.3791       4
                                                 4.1903       2
                                                 4.3791       4
                                                 4.1903       2
                                                 4.1903       2
                                                 4.1903       2
                                                 4.1903       2
                                                 4.1903       2
                                                 4.1903       2
                                                 4.1903       2
                                                 4.1903       2
                                                 4.1903       2
    4    Se                  4.632       16
                                                 4.3791       3
                                                 4.195        2
                                                 4.3791       3
                                                 4.195        2
                                                 4.3791       3
                                                 4.195        2
                                                 4.3791       3
                                                 4.195        2
                                                 4.195        2
                                                 4.195        2
                                                 4.195        2
                                                 4.195        2
                                                 4.195        2
                                                 4.195        2
                                                 4.195        2
                                                 4.195        2
    5   Cu   ,Cu             3.492        4
                                                 2.4562       3
                                                 2.6086       4
                                                 2.5529       2
                                                 2.5529       2
    6   Cu   ,Cu             3.492        4
                                                 3.3567       3
                                                 2.2799       4
                                                 2.3571       2
                                                 2.3571       2
    7   Cu   ,Cu             3.492        2
                                                 2.1265       3
                                                 2.2526       4

  X-ray diffraction powder data (II),  X-Ray W.L. =   1.54056(angs.):

  No   H   K   L   Theta 2*Theta    S       LPG   MF        F          I int.
                    ( degree )                                         *100

    1   1   1   1  7.581  15.162   0.086  111.96    8       57.8      280.2
    2   2   0   0  8.762  17.524   0.099   83.25    6       35.9       60.1
    3   2   2   0 12.441  24.882   0.14    40.22   12      120.1      651.3
    4   1   1   3 14.633  29.265   0.164   28.52   24      212.3     2885.1
    5   2   2   2 15.299  30.597   0.171   25.93    8      686.3     9132.5
    6   4   0   0 17.738  35.477   0.198   18.81    6       76.6       61.9
    7   3   3   1 19.391  38.781   0.216   15.46   24       69.4      167.2
    8   4   2   0 19.915  39.831   0.221   14.57   24       89.2      260.0
    9   2   2   4 21.91   43.819   0.242   11.77   24      252.1     1678.4
   10   1   1   5 23.314  46.629   0.257   10.23   24      383.0     3367.5
   11   3   3   3 23.314  46.629   0.257   10.23    8      507.7     1971.9
   12   4   4   0 25.523  51.045   0.28     8.33   12      761.6     5419.0
   13   5   3   1 26.783  53.566   0.292    7.46   48      130.5      570.2
   14   4   4   2 27.194  54.388   0.297    7.21   24       75.4       91.9
   15   6   0   0 27.194  54.388   0.297    7.21    6      260.0      273.3
   16   6   2   0 28.798  57.596   0.313    6.33   24      177.5      447.3
   17   3   3   5 29.964  59.929   0.324    5.79   24      203.4      537.3
   18   2   2   6 30.347  60.694   0.328    5.63   24      379.9     1821.7
   19   4   4   4 31.85   63.701   0.343    5.06    8      135.5       69.5
   20   1   1   7 32.952  65.905   0.353    4.7    24      106.1      118.8
   21   5   5   1 32.952  65.905   0.353    4.7    24       77.8       63.8
   22   6   4   0 33.316  66.631   0.357    4.59   24        3.5        0.1
   23   6   4   2 34.749  69.498   0.37     4.21   48      107.3      217.4
   24   5   5   3 35.807  71.613   0.38     3.96   24      203.2      366.8
   25   7   3   1 35.807  71.613   0.38     3.96   48      154.2      422.6
   26   8   0   0 37.542  75.083   0.396    3.62    6      595.2      719.7
   27   3   3   7 38.569  77.138   0.405    3.45   24       66.7       34.5
   28   4   4   6 38.909  77.819   0.408    3.4    24       65.4       32.7
   29   8   2   0 38.909  77.819   0.408    3.4    24       41.7       13.3
   30   2   2   8 40.263  80.527   0.42     3.22   24      222.4      357.7
   31   6   6   0 40.263  80.527   0.42     3.22   12      394.2      561.8
   32   5   5   5 41.272  82.543   0.428    3.11    8      399.8      371.6
   33   7   5   1 41.272  82.543   0.428    3.11   48      222.1      688.3
   34   6   6   2 41.607  83.213   0.431    3.08   24      413.6     1180.2
   35   8   4   0 42.942  85.885   0.442    2.96   24      167.0      185.2
   36   1   1   9 43.941  87.882   0.45     2.89   24      121.4       95.5
   37   7   5   3 43.941  87.882   0.45     2.89   48      106.0      145.7
   38   8   4   2 44.274  88.547   0.453    2.87   48       94.1      114.0


  X-ray diffraction powder data (I)...X-Ray wave length =  1.54056 (angs.):

  No   H   K   L   Theta 2*Theta    d           I int   I int.n.  I p.h.n.   H(Si)
                    ( degree )   (angstrem)     *100                         *100

    1   1   1   1   7.581  15.162  5.83874      280.2      3.1      3.1     5.6
    2   2   2   0  12.441  24.882  3.57549      651.3      7.1      7.2     5.6
    3   1   1   3  14.633  29.265  3.04918     2885.1     31.6     31.6     5.6
    4   2   2   2  15.299  30.597  2.91937     9132.5    100.0    100.0     5.6
    5   3   3   1  19.391  38.781  2.32008      167.2      1.8      1.8     5.7
    6   4   2   0  19.915  39.831  2.26134      260.0      2.8      2.8     5.7
    7   2   2   4  21.91   43.819  2.06431     1678.4     18.4     18.1     5.7
    8   1   1   5  23.314  46.629  1.94625     5339.4     58.5     57.6     5.7
    9   4   4   0  25.523  51.045  1.78774     5419.0     59.3     58.1     5.8
   10   5   3   1  26.783  53.566  1.70941      570.2      6.2      6.1     5.8
   11   6   0   0  27.194  54.388  1.6855       365.2      4.0      3.9     5.8
   12   6   2   0  28.798  57.596  1.59901      447.3      4.9      4.8     5.8
   13   3   3   5  29.964  59.929  1.54222      537.3      5.9      5.7     5.8
   14   2   2   6  30.347  60.694  1.52459     1821.7     19.9     19.3     5.8
   15   1   1   7  32.952  65.905  1.4161       182.6      2.0      1.9     5.9
   16   6   4   2  34.749  69.498  1.35141      217.4      2.4      2.3     5.9
   17   7   3   1  35.807  71.613  1.3166       789.4      8.6      8.2     5.9
   18   8   0   0  37.542  75.083  1.26412      719.7      7.9      7.4     6.0
   19   6   6   0  40.263  80.527  1.19183      919.5     10.1      9.4     6.1
   20   7   5   1  41.272  82.543  1.16775     1059.9     11.6     10.8     6.1
   21   6   6   2  41.607  83.213  1.16004     1180.2     12.9     12.0     6.1
   22   8   4   0  42.942  85.885  1.13067      185.2      2.0      1.9     6.1
   23   7   5   3  43.941  87.882  1.11005      241.3      2.6      2.4     6.2
   24   8   4   2  44.274  88.547  1.10342      114.0      1.2      1.1     6.2

Reference:
Chichagov A.V. et al.
Information-Calculating System on Crystal Structure Data of Minerals
(MINCRYST)
- Kristallographiya, v.35, n.3, 1990, p.610-616 (in Russian)