Since crystal lattice plane spacings are accurately known from x-ray measurements, they provide a good test of microscope stability and a calibration of magnification in the upper range of magnification of the instrument.
Plane Spacing 0.9nm and 0.45nm – Asbestos Crocidolite.
- The 0.9 nm spacing (020) will be found along the axis of the crocidolite fibers. The 0.45 nm spacing appears at an angle of about 60° in suitable crystal orientations. Because of the hazards of asbestos, this sample is sandwiched between carbon and formvar films, than mounted onto a 3.05 mm grid.
Plane Spacing 0.56 - Potassium Chloroplantane
Plane Spacing 0.34 - Graphitized Carbon Black
Plane Spacing 0.204 nm, 0.143 nm and 0.102 nm – Oriented Single Crystal Gold Foil
- These gold foils are mounted on gold grids, a valuable tool to check resolution, image quality, magnification and instrument stability.