Acta Cryst. (2008). E64, i17  [ doi:10.1107/S1600536808003231 ]

A quaternary germanium(II) phosphate, Na[Ge₄(PO₄)₃]

C.-S. Lee and S.-F. Weng

Online 6 February 2008

Key indicators

• Single-crystal X-ray study
• T = 298 K
• Mean (Ge-O) = 0.013 Å
• R factor = 0.058
• wR factor = 0.133
• Data-to-parameter ratio = 10.3

checkCIF/PLATON results

No syntax errors found




Alert level B
PLAT148_ALERT_3_B su on the      c  - Axis is Too Large (x 1000) .         30 Ang. 

Alert level C
PLAT062_ALERT_4_C Rescale T(min) & T(max) by .....................       0.35      
PLAT395_ALERT_2_C Deviating  X-O-Y  Angle from 120 Deg for      O3     141.50 Deg. 
PLAT779_ALERT_2_C Suspect or Irrelevant (Bond) Angle in CIF ......      43.30 Deg. 
              O1   -GE2  -NA1     1.555   1.555   1.665                        

Alert level G
ABSTM02_ALERT_3_G  When printed, the submitted absorption T values will be
            replaced by the scaled T values. Since the ratio of scaled T's
            is identical to the ratio of reported T values, the scaling
            does not imply a change to the absorption corrections used in
            the study.
            Ratio of Tmax expected/reported      0.350
            Tmax scaled      0.350 Tmin scaled      0.171
REFLT03_ALERT_4_G  WARNING: Large fraction of Friedel related reflns may
                     be needed to determine absolute structure
           From the CIF: _diffrn_reflns_theta_max           28.28
           From the CIF: _reflns_number_total                639
           Count of symmetry unique reflns          501
           Completeness (_total/calc)            127.54%
           TEST3: Check Friedels for noncentro structure
           Estimate of Friedel pairs measured       138
           Fraction of Friedel pairs measured     0.275
           Are heavy atom types Z>Si present        yes
PLAT033_ALERT_2_G Flack Parameter Value Deviates from zero .......       0.23      
PLAT792_ALERT_1_G Check the Absolute Configuration of P1     = ...          R      
PLAT860_ALERT_3_G Note: Number of Least-Squares Restraints .......          1      

   0 ALERT level A = In general: serious problem
   1 ALERT level B = Potentially serious problem
   3 ALERT level C = Check and explain
   5 ALERT level G = General alerts; check

   1 ALERT type 1 CIF construction/syntax error, inconsistent or missing data
   3 ALERT type 2 Indicator that the structure model may be wrong or deficient
   3 ALERT type 3 Indicator that the structure quality may be low
   2 ALERT type 4 Improvement, methodology, query or suggestion
   0 ALERT type 5 Informative message, check

Copyright © International Union of Crystallography
IUCr Webmaster