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Table 1: Phase parameters for calculation
Phase | Lattice parameter count | Prefered orientation | Peak shape model | Special features |
---|---|---|---|---|
quartz | 2 | 4th order | crystallite size | - |
kaolinite | 6 | 2th order | clay disorder model | - |
muscovite 2M1 | 4 | 2th order | crystallite size and micro strain |
site occupation for K+ |
Illite 1Mt | 4 | - | crystallite size and micro strain |
- |
svanbergite | 2 | 4th oder, automatic reduced to 2th order |
crystallite size and micro strain |
- |
anatase | 2 | - | crystallite size | - |
Table 2: Calculation results (weight %)
Phase | Nominal content | Rietveld content |
---|---|---|
quartz | 15.0 | 16.2 |
kaolinite | 71.6 | 71.6 |
muscovite 2M1 | 12.8 (illite) | muscovite 2M1 9.0 Illite1Mt 0.9 =9.9 |
accessories | - | Svanbergite 1.0 Anatase 0.7 =1.7 |
Figure 1: Observed, calculated and difference pattern for the kaolin Spergau sample