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A dual-beam three-crystal spectrometer for high-sensitivity lattice-parameter comparison measurements of high-perfection crystals is described. It has a sensitivity, Δd/d, of up to ±3 x 10−8 when CuKα1 radiation is used. This spectrometer is also employed as a high-sensitivity double-crystal topographic camera. Examples of applications to doped float-zone and epitaxic layers of silicon crystals are reported, together with low- and high-temperature measurements done with a cryostat designed for high thermal stability.
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