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Equipment PDF

The Scientific-Didactic Scanning Microscopy and Microanalysis Laboratory is equipped with:

a Hitachi S-3700N scanning electron microscope (SEM),

a Noran SIX energy dispersive X-ray spectrometer (EDS) microanalyser (ultra-dry silicon drift type) plus software, and

two Cressington gold and carbon coaters supplied with a thickness monitor.

The S-3700N microscope comes with a secondary electron detector (SE), a five-segment backscattered electron (BSE) detector, and a variable pressure (VP) mode. The allowable range of vacuum levels, from 6 to 270 Pa, allows observation of both, coated samples and ones in their natural state, without the need of conventional sample preparation (on condition that they do not contain volatile substances).

The microscope has a huge sample chamber and can accommodate samples as large as 300 mm in diameter and 110 mm high. The ultra-dry EDS detector with a resolution power (FWHM) of 129 eV that it is equipped with makes it possible to analyse the chemical composition of selected sample fragments.

The Lab performs qualitative analyses (determination of the presence of an element in a sample), semi-quantitative and quantitative analyses (quantitative measurements are obtained using SPI 53 mineral standards), elemental mapping, and line profile analyses.

The fume cupboard mounted in the Lab allows drying samples with the help of chemicals.

The possibility of work in a high or low vacuum mode, the capacious sample chamber, and the attached microanalyser make the instrument useful in:

• studying the morphology of crystals and rocks, microorganisms, plants and their pollen, microporosity, the structure of paintings, and the patina covering historical objects or jewellery, and

• determining the chemical composition of natural and synthetic minerals, metal alloys, paintings, pieces of jewellery, etc.