Powder diffraction of a sample (P-XRD) allows the identification of crystalline phases. While a powdered sample is irradiated with x-rays at a specific energy, the angle 2Theta within the Bragg-geometry of sample and detector is changing. This results in constructive interference of radiation for specific angles for a given phase and produces a so called powder pattern which is the result after scanning a typical 2Theta interval. This pattern will be then matched with reference data. Known mineral phases which were published will always contain this reference data. The Bragg-Brentano setup is illustrated here: 

 diffraktometer schema3         

       image source: Common point detector setup. modified figure

URL http://www.d2phaser.com/images/d2-phaser/images/Bilder_1-1/Bilder_1-1-1.jpg 

         [Online; visited on 17. Juli 2017].


Our offering: 

  • qualitative phase analysis  via x-ray diffraction of extremely small amounts of material (mg-regime, comparable to very few grains of salt)
  • each measurement includes a diffraction pattern (intensity vs. 2Theta), a table with d-values and a phase identification (if possible)
  • determination of phase volumes, atomic substition, lattice constant via Rietveld refinement on request (FullProf/Powdercell) 
  • for a definite phase identification the knowledge of the chemical composition is sometimes needed (EDS analysis). E.g. vivianite group minerals with (M3(XO4)2 · 8H2O, where X = As, P M = Mg, Mn, Fe, Co, Ni, Cu, Zn) 
  • waiting time not longer than 2 weeks

picro

   Fit of sample (red) and reference picropharmacolite (green bars and blue lines)


How To: 

After purchase  was succesfully completed, you will receive an invoice with our address in Germany, where you will send the material/samples to.

We offer two options for the shipment of the samples:

1st option: You can order your shipment material here and isolate the material with a needle at home in a capsula. 

2nd option: It is also possible to send your sample without any preparation but with a marker indicating the material to isolate and a short note what and how we shall analyse the isolate. Previous results eg. SEM-EDS results should be sent too as they can help while the identification process.

Please choose a shipment method while checking out if you want to get a return of your samples (+5.00€ for small samples).


lab equipment: 

Analysis will be carried out on a Rigaku Miniflex Benchtop diffractometer system with Bragg geometry at 40kV and 15mA.

For a reasonable signal-noise ratio we use a silicon zero background holder. This allows us to obtain results from very small amounts. 

see also for more information: https://www.rigaku.com/en/products/xrd/miniflex/app028

For fitting the data we use the COD or ICSD data base. 

 IMG 1032


How to order: 

  • P-XRD measurement of sample with intensity-2Theta profile, d-value table and phase matching 

price/sample: 25€

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