Acta Cryst. (2004). E60, i77-i79  [ doi:10.1107/S1600536804012772 ]

NaMg₄(AsO₄)₃

H. A. Anissa, A. Brahim and H. Amor

Online 5 June 2004

Key indicators

• Single-crystal X-ray study
• T = 293 K
• Mean (Mg-O) = 0.003 Å
• R factor = 0.018
• wR factor = 0.045
• Data-to-parameter ratio = 10.9

checkCIF/PLATON results

No syntax errors found



Alert level A
PLAT052_ALERT_1_A (Proper) Absorption Correction Method Missing ..          ?
PLAT057_ALERT_3_A Correction for Absorption Required   RT(exp) ...       1.60       

Alert level G
REFLT03_ALERT_4_G 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.
           From the CIF: _diffrn_reflns_theta_max           27.93
           From the CIF: _reflns_number_total                525
           Count of symmetry unique reflns          322
           Completeness (_total/calc)            163.04%
           TEST3: Check Friedels for noncentro structure
           Estimate of Friedel pairs measured       203
           Fraction of Friedel pairs measured     0.630
           Are heavy atom types Z>Si present          yes

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

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

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