Clay-size (<4 micron) Only
Analysis
K/T GeoServices, Inc.
X-ray Diffraction
Mineralogy with Impact
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Analytical Procedures
XRD analyses of the samples are performed using a Rigaku or Scintag automated powder diffractometer equipped with a Cu X-ray radiation source (40 Kv, 35 mA) and a solid state or scintillation detector. The glycol-solvated oriented clay mounts are analyzed over an angular range of 2-50 degrees 2 theta at a scan rate of 1.5 degrees/minute.Quantitative analyses of the diffraction data are done using integrated peak areas (derived from peak deconvolution / profile-fitting techniques) and combined empirical and calculated reference intensity ratio (RIR) factors. The weight fractions of the clay minerals (and clay-size rock-forming minerals) are determined for the clay mounts of each sample and normalized to 100%. Determinations of mixed-layer clay ordering and percent expandable interlayers are done by comparing experimental diffraction data from the glycol-solvated clay aggregates with simulated one dimensional diffraction profiles generated using the program NEWMOD written by R. C. Reynolds.
Data reported in the table and provided to you as a spreadsheet or other computer-readable file are formatted as weight percent, but are actually calculated as weight fractions. Therefore, slight rounding errors may be observed in the formatted data.