Acta Cryst. (2003). E59, i59-i61  [ doi:10.1107/S1600536803006329 ]

Tetragonal form of barium cobalt disilicate, Ba₂CoSi₂O₇

B. El Bali and P. Y. Zavalij

Online 31 March 2003

Key indicators

• Single-crystal X-ray study
• T = 293 K
• Mean (Si-O) = 0.006 Å
• R factor = 0.025
• wR factor = 0.064
• Data-to-parameter ratio = 16.9

checkCIF results

No syntax errors found

ADDSYM reports no extra symmetry


 Alert Level B:



PLAT_213  Alert B Atom O1      has ADP max/min Ratio ...........       4.40 prolate

General Notes



REFLT_03                                                                        
         From the CIF: _diffrn_reflns_theta_max           30.48                 
         From the CIF: _reflns_number_total                575                  
         Count of symmetry unique reflns          359                           
         Completeness (_total/calc)            160.17%                          
         TEST3: Check Friedels for noncentro structure                          
         Estimate of Friedel pairs measured       216                           
         Fraction of Friedel pairs measured     0.602                           
         Are heavy atom types Z>Si present          yes                         
          Please check that the estimate of the number of Friedel pairs is      
          correct. If it is not, please give the correct count in the           
          _publ_section_exptl_refinement section of the submitted CIF.          


 0 Alert Level A = Potentially serious problem

 1 Alert Level B = Potential problem

 0 Alert Level C = Please check

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