Whole powder pattern decomposition methods and applications: A retrospection

Powder Pattern Decomposition with the Aid of Preferred Orientation

A method of decomposition of overlapping reflections in a powder pattern with the aid of preferred orientation is presented. Empirical preferred orientation correction with axial symmetry is used. The method is tested on several sets of simulated powder patterns. Introduction Powder patterns collected at various values of some parameter which influences either the position or the intensity of t...

Quantitative Phase Analysis Using the Whole-Powder-Pattern Decomposition Method: Application to Ten-Component Mixtures and Natural Products

The procedure for the quantitative phase analysis using the whole-powder-pattern decomposition method has been applied to ten-component mixtures of synthesized ceramic materials and a five-component mixture of natural products. Average deviations of the calculated weight fractions of respective phases from those prepared in mixing were within 1 weight percent (wt.%), and they were smaller than ...

X-ray Powder Diffraction Pattern Indexing for Pharmaceutical Applications

Crystal-structure determination using X-ray diffraction from single crystals is a well-developed technique (1). A single crystal structure provides full structural characterization of the form at the atomic scale. The main drawback to single crystal diffraction is the need to grow a sufficiently large and defect-free crystal for analysis, which is not practical for all crystal forms. Furthermor...

Sequential Methods and Their Applications

Powder Methods

In one form of powder methods, the powder is compressed in a die and subsequently sintered. The final dimensions are determined by the powder, die, compaction pressure, and sintering densification cycle. The higher the compaction pressure, the higher the final density and properties. Minimal densification occurs in sintering if the powders are large and the sintering temperature is low. This is...