Did you look at the structure in XCrySDen? It looks like the O and B atoms are overlapping. This can indicate that either your structure is wrong or maybe your material has partial occupancy [ http://www.mail-archive.com/wien@zeus.theochem.tuwien.ac.at/msg05007.html , http://www.mail-archive.com/wien%40zeus.theochem.tuwien.ac.at/msg00226.html ].

On 9/22/2014 10:17 AM, Bing Zhou wrote:
Dear all,
I am puzzled by the extremely small RMT in the following unit cell, did I do 
something wrong?  could you please check the case.struct and help me out?
Thanks!
Bing

Mi et al, Zn3B7O13Cl
R   LATTICE,NONEQUIV.ATOMS: 10161_R3c
MODE OF CALC=RELA unit=bohr
  16.133071 16.133071 39.624719 90.000000 90.000000120.000000
ATOM  -1: X=0.14634999 Y=0.29415000 Z=0.32700000
           MULT= 6          ISPLIT= 8
ATOM  -1:X= 0.29415000 Y=0.32700000 Z=0.14634999
ATOM  -1:X= 0.64634999 Y=0.82700000 Z=0.79415000
ATOM  -1:X= 0.32700000 Y=0.14634999 Z=0.29415000
ATOM  -1:X= 0.82700000 Y=0.79415000 Z=0.64634999
ATOM  -1:X= 0.79415000 Y=0.64634999 Z=0.82700000
Zn         NPT=  781  R0=0.00005000 RMT=    1.3400   Z: 30.0
LOCAL ROT MATRIX:    1.0000000 0.0000000 0.0000000
                      0.0000000 1.0000000 0.0000000
                      0.0000000 0.0000000 1.0000000
ATOM  -2: X=0.00000000 Y=0.00000000 Z=0.26670000
           MULT= 6          ISPLIT= 8
ATOM  -2:X= 0.00000000 Y=0.26670000 Z=0.00000000
ATOM  -2:X= 0.50000000 Y=0.76670000 Z=0.50000000
ATOM  -2:X= 0.26670000 Y=0.00000000 Z=0.00000000
ATOM  -2:X= 0.76670000 Y=0.50000000 Z=0.50000000
ATOM  -2:X= 0.50000000 Y=0.50000000 Z=0.76670000
Cl         NPT=  781  R0=0.00010000 RMT=    1.2200   Z: 17.0
LOCAL ROT MATRIX:    1.0000000 0.0000000 0.0000000
                      0.0000000 1.0000000 0.0000000
                      0.0000000 0.0000000 1.0000000
ATOM  -3: X=0.16450001 Y=0.83470000 Z=0.08310000
           MULT= 6          ISPLIT= 8
ATOM  -3:X= 0.83470000 Y=0.08310000 Z=0.16450001
ATOM  -3:X= 0.66450001 Y=0.58310000 Z=0.33470000
ATOM  -3:X= 0.08310000 Y=0.16450001 Z=0.83470000
ATOM  -3:X= 0.58310000 Y=0.33470000 Z=0.66450001
ATOM  -3:X= 0.33470000 Y=0.66450001 Z=0.58310000
B          NPT=  781  R0=0.00010000 RMT=    0.3700   Z:  5.0
LOCAL ROT MATRIX:    1.0000000 0.0000000 0.0000000
                      0.0000000 1.0000000 0.0000000
                      0.0000000 0.0000000 1.0000000
ATOM  -4: X=0.10220001 Y=0.89750000 Z=0.97120000
           MULT= 6          ISPLIT= 8
ATOM  -4:X= 0.89750000 Y=0.97120000 Z=0.10220001
ATOM  -4:X= 0.60220001 Y=0.47120000 Z=0.39750000
ATOM  -4:X= 0.97120000 Y=0.10220001 Z=0.89750000
ATOM  -4:X= 0.47120000 Y=0.39750000 Z=0.60220001
ATOM  -4:X= 0.39750000 Y=0.60220001 Z=0.47120000
B          NPT=  781  R0=0.00010000 RMT=    0.3700   Z:  5.0
LOCAL ROT MATRIX:    1.0000000 0.0000000 0.0000000
                      0.0000000 1.0000000 0.0000000
                      0.0000000 0.0000000 1.0000000
ATOM  -5: X=0.00000000 Y=0.00000000 Z=0.10170000
           MULT= 6          ISPLIT= 8
ATOM  -5:X= 0.00000000 Y=0.10170000 Z=0.00000000
ATOM  -5:X= 0.50000000 Y=0.60170000 Z=0.50000000
ATOM  -5:X= 0.10170000 Y=0.00000000 Z=0.00000000
ATOM  -5:X= 0.60170000 Y=0.50000000 Z=0.50000000
ATOM  -5:X= 0.50000000 Y=0.50000000 Z=0.60170000
B          NPT=  781  R0=0.00010000 RMT=    0.3700   Z:  5.0
LOCAL ROT MATRIX:    1.0000000 0.0000000 0.0000000
                      0.0000000 1.0000000 0.0000000
                      0.0000000 0.0000000 1.0000000
ATOM  -6: X=0.00000000 Y=0.00000000 Z=0.98910000
           MULT= 6          ISPLIT= 8
ATOM  -6:X= 0.00000000 Y=0.98910000 Z=0.00000000
ATOM  -6:X= 0.50000000 Y=0.48910000 Z=0.50000000
ATOM  -6:X= 0.98910000 Y=0.00000000 Z=0.00000000
ATOM  -6:X= 0.48910000 Y=0.50000000 Z=0.50000000
ATOM  -6:X= 0.50000000 Y=0.50000000 Z=0.48910000
O          NPT=  781  R0=0.00010000 RMT=    0.0900   Z:  8.0
LOCAL ROT MATRIX:    1.0000000 0.0000000 0.0000000
                      0.0000000 1.0000000 0.0000000
                      0.0000000 0.0000000 1.0000000
ATOM  -7: X=0.83969999 Y=0.99970000 Z=0.10500000
           MULT= 6          ISPLIT= 8
ATOM  -7:X= 0.99970000 Y=0.10500000 Z=0.83969999
ATOM  -7:X= 0.33969999 Y=0.60500000 Z=0.49970000
ATOM  -7:X= 0.10500000 Y=0.83969999 Z=0.99970000
ATOM  -7:X= 0.60500000 Y=0.49970000 Z=0.33969999
ATOM  -7:X= 0.49970000 Y=0.33969999 Z=0.60500000
O          NPT=  781  R0=0.00010000 RMT=    0.0900   Z:  8.0
LOCAL ROT MATRIX:    1.0000000 0.0000000 0.0000000
                      0.0000000 1.0000000 0.0000000
                      0.0000000 0.0000000 1.0000000
ATOM  -8: X=0.29140000 Y=0.26330000 Z=0.96390000
           MULT= 6          ISPLIT= 8
ATOM  -8:X= 0.26330000 Y=0.96390000 Z=0.29140000
ATOM  -8:X= 0.79140000 Y=0.46390000 Z=0.76330000
ATOM  -8:X= 0.96390000 Y=0.29140000 Z=0.26330000
ATOM  -8:X= 0.46390000 Y=0.76330000 Z=0.79140000
ATOM  -8:X= 0.76330000 Y=0.79140000 Z=0.46390000
O          NPT=  781  R0=0.00010000 RMT=    0.0900   Z:  8.0
LOCAL ROT MATRIX:    1.0000000 0.0000000 0.0000000
                      0.0000000 1.0000000 0.0000000
                      0.0000000 0.0000000 1.0000000
ATOM  -9: X=0.19720000 Y=0.97660000 Z=0.91210000
           MULT= 6          ISPLIT= 8
ATOM  -9:X= 0.97660000 Y=0.91210000 Z=0.19720000
ATOM  -9:X= 0.69720000 Y=0.41210000 Z=0.47660000
ATOM  -9:X= 0.91210000 Y=0.19720000 Z=0.97660000
ATOM  -9:X= 0.41210000 Y=0.47660000 Z=0.69720000
ATOM  -9:X= 0.47660000 Y=0.69720000 Z=0.41210000
O          NPT=  781  R0=0.00010000 RMT=    0.0900   Z:  8.0
LOCAL ROT MATRIX:    1.0000000 0.0000000 0.0000000
                      0.0000000 1.0000000 0.0000000
                      0.0000000 0.0000000 1.0000000
ATOM -10: X=0.69260001 Y=0.76990000 Z=0.02120000
           MULT= 6          ISPLIT= 8
ATOM -10:X= 0.76990000 Y=0.02120000 Z=0.69260001
ATOM -10:X= 0.19260001 Y=0.52120000 Z=0.26990000
ATOM -10:X= 0.02120000 Y=0.69260001 Z=0.76990000
ATOM -10:X= 0.52120000 Y=0.26990000 Z=0.19260001
ATOM -10:X= 0.26990000 Y=0.19260001 Z=0.52120000
O          NPT=  781  R0=0.00010000 RMT=    0.0900   Z:  8.0
LOCAL ROT MATRIX:    1.0000000 0.0000000 0.0000000
                      0.0000000 1.0000000 0.0000000
                      0.0000000 0.0000000 1.0000000
    0      NUMBER OF SYMMETRY OPERATIONS

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