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XRD Lab

D 5000 diffractometer with 40 fold sample changer
D 5000 diffractometer with 40 fold sample changer
D8 with Vantec detector and reaction chamber
D8 with Vantec detector and reaction chamber
D 5000 diffractometer with SolX detector and reaction chamber
D 5000 diffractometer with SolX detector and reaction chamber
GADDS with Eulerian cradle, Göbel mirrors and HiStar-detector
GADDS with Eulerian cradle, Göbel mirrors and HiStar-detector

The Chair for Mineralogy operates 4 diffractometers, one of them together with the Chair for Endogene Dynamics. All diffractometers are speciall adapted to the projects of the Applied Mineralogy Group.

D5000 with secondary graphite monochromator and 40-fold sample changer

This device is perferably used for routine analytics. This concerns mainly qualitative phase analyses of powderded samples and small formated solid samples. The preparation is proceeded in standard frontloading - and in specally designed sideloading and backloading sample holders. For the investigation of very small amounts of samples single crystal sample holders are available. The quality of the data meet the requirements for the Rietveld refinement of the powders. The XRD pattern were evaluated for the lattice parameters and real structural effects of the phases. The determination of the quantitative phase content is also carried out by the Rietveld method. The Chair for Mineralogy has prooven a lot of competence in quantitative phase analyses and the calibration of such analyses (Projects of the Applied Mineralogy).

D8 with reaction chamber and position sensitive Vantec detector

The D8 is preferably used for in-situ phase analyses. Cement containing samples are continuously analysed by X-ray diffraction during hydration reaction. The fast detection by the Vantec leads to very good time resolved measurements. The evaluation of the data may be done qualitatively with information on the change in crystalline phase destribution over time. Special focus we put on the quantitative evaluation of the in-situ X-ray diffraction data. The Rietveld method is also applied for this purpose. The Rietveld data
have therefore to be corrected by specially adapted algorithms. The reaction chamber (construction and manufacturing at the precision mechanics workshop of the Mineralogy) allows the exclution of CO2 and strongly reduces the evaporation of water from the wet samples during reaction (Projects of the Applied Mineralogy). The control of the temperature allows the investigation of the samples in a range from 16°C up to 70°C.

D5000 with reaction chamber and high resolution SolX detector

This device is operated together with the Chair for Endogene Dynamics. Due to the Sol-X semiconducting detector the device offers a superb peak-background ratio and and beause of the peak shapes it is qualified for highly accurate quantitative phase analyses. In-situ quantifications could be carried out with an accuracy down to 0,2 Ma.-% (Projects of the Applied Mineralogy). The control of the temperature allows the investigation of the samples in a range from 16°C up to 70°C. 

Generel Area Detector Diffraction System (GADDS)

The GADDS at the Chair for Mineralogy is equipped with crossed Göbel mirrors,  a quarter cirle Euerian cradle and a 2D HiStar detector. Position resolved x-ray analyses is possible with the help of collimators ranging from 50 und 800 micron without damaging the sample. At the same time the orientation of crystallites can be investigated by the GADDS technique (Projects of the Applied Mineralogy)