No Cell Restraint

2 Cell-restrained Whole Powder Pattern Decomposition 

Imposition of the peak positions calculated from a cell knowledge marked a great step in the quest for ab initio structure determination by powder 

2 The Le Bail Method. To be able to estimate R factors related to integrated intensities, Rietveld stated a fair approximation to the observed integrated intensity can be made by separating the peaks according to the calculated values of the integrated intensities, i.e.  

---