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X-ray powder diffraction laboratory  

Responsabile /
  Dapiaggi Monica     email    monica.dapiaggi@unimi.it  telefono   +39 02 503 15605
Personale di
riferimento /
Attrezzature /
  XRPD_1       XRPD_2      XRPD_3

Philips X’pert MPD with high temperature chamber

Main specifications

It's a theta/theta diffractometer, with a double detector system: a proportional counter
and a position sensitive detector are present. The diffractometer is equipped with a
high-temperature chamber (AHT-PAP 1600), with a maximum temperature of 1600°C.
The diffractometer is fully computer-integrated, with incident and anti-scatter opticsc
ompletely programmable. The two detectors can be used for different purposes:
for structural analyses the former, and for fast reaction kinetics the latter.
The AHT hot chamber is equipped with a stepper motor, that moves the sample downwards
as a function of the thermal expansion of the sample holder, in order to keep the sample
in the ideal diffraction position. The sample, at the same time, can be spinned for a better
counting statistics and temperature uniformity. Temperature oscillations inside the chamber
are never bigger than 1°C, even at the highest attainable temperature (1600°C), and for
temperatures lower than 1200°C are within 0.2°. The data quality is therefore particularly good,
and data collected with this instrument can be used for structure refinement at high temperature.

High resolution X-ray powder diffractometer Panalytical X’pert Pro

Main specifications

It’s a high-resolution powder diffractomer, equipped with an incident beam monochromator,
that separates the Ka1 and the Ka2, allowing the measurements to be performed with the Ka1 only.
The diffractometer can work with the usual Bragg Brentano geometry (divergent beam) as well as
with a parallel beam geometry. The latter allows the use of rough samples, of samples not perfectly
positioned on the goniometer circle, and has a particularly good signal-to-noise ratio. The detector
X’Celerator completes the instrument, allowing very fast data collection (for a qualitative analysis
the data collection time is of the order of minutes), together with an excellent signal-to-noise ratio.
A 15 positions sample changer is also mounted on the instrument.

Attività di Ricerca
svolta dal
laboratorio /
Research activities
High resolution powder diffraction, qualitative and quantitative analyses,
structural refinements with the Rietveld method, in-situ high temperature experiments



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