![]() Site map |
|||
![]() |
![]() |
![]() |
![]() |
![]() |
![]() |
![]() |
Phase | Lattice parameter count | Prefered orientation | Peak model | Special features |
---|---|---|---|---|
quartz | 2 | - | crystallite size | - |
kaolinite | 6 | 6 | crystallite size; microstrain | 6 disordering parameters |
muscovite 2M1 | 4 |
6th order; automatic reduced to 2th order |
crystallite size anisotropic | site occupation for K+ |
Table 1: Phase parameters for calculation
Phase | Nominal content | Rietveld content |
---|---|---|
quartz | 15.0 | 16.9 |
kaolinite | 71.6 | 75.4 |
muscovite 2M1 | 12.8 (illite) | 7.7 |
Table 2: Calculation results (weight %)
the calculated mica concentration is too low because substantial more illite 1M and 1Md than muscovite is contained in the sample; consequently quartz and kaolinite are overestimated
Figure 1: Observed, calculated and difference Cu-K-alpha powder pattern for the kaolin Spergau sample