What is the best way to calibrate XRF which will be used to test chemistry of Clays and Feldspars? Is going for Certified Reference Materials from companies like Fisher Scientic, MBH Analytical etc whose Chemistry is known or calibrating the machine with known samples (sample matrices from process) whose chemistry is determined by analytical methods like ICP-MS, Wet Chemistry etc.
Depends on what is your analytical goal. Depending on that, the use of pure elements or compounds as standards might be an inexpensive possibility, too.
As Erik wrote you, it is the simplest way, if you use pure elements. In example alpha-Iron. If your diffractometer is equipped in copper lamp, you observe the highest reflex in position 2theta=44.7 degree. In case of cobalt lamp, reflex will be visible in 52 degree.
Of course you can use monocrystal of Al2O3 - Bruker sells it. Other material is LaB6.
Good luck
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