- High-temperature Furnaces (1300°C) for experiments in air and at low oxygen
fugacities, using H2/CO2 gas mixtures regulated by mass-flow
controllers. The oxygen fugacity can be monitored by use of solid electrolyte oxygen
sensors. This equpiment is mostly used for crystal synthesis by flux-growth methods.
- X-ray Powder Diffractometer (Philips PW1050) with graphite
- Scanning Electron Microscope (Hitachi S-4300 FE-SEM) with
accessory equipment for energy dispersive X-ray analyses (EDS) and cathodoluminiscens
imaging (MiniCL and MonoCL) provides excellent possibilities for microchemical studies and
imaging of solid phases.
- Mössbauer Spectrometer (Wissel) for studies of Fe valence states
and coordination in minerals. Spectra can be obtained at ambient and low-temperature by
use of a liquid-nitrogen cryostat. Normal samples should contain 2-5 mg Fe, with a total
weight limit around 100 mg.
- Microscope-Spectrophotometer (Zeiss MPM800) for measurements of
optical absorption or transmission spectra in the UV-VIS-NIR range from ca. 280 to ca.
2200 nm. The spatial resolution of the instrument allows measurements of polarised optical
spectra of small (Ø~20 µm) single crystals at a spectral resolution of 1 nm. The
equipment is mainly used for studies of valency and coordination of transition metal
cations in solids through analyses of absorption bands caused by electron transitions, but
numerous other applications are possible. An accessory diamond anvil cell (DAC) provides
means to record absorption spectra at elevated pressures.
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