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- W2153442834 abstract "The thermal expansion of GeSe has been studied above room temperature up to the melting point of 670 ± 5°C by X-ray diffraction techniques using a 190 mm Unicam high temperature camera. The thermal expansion of the crystallographic axes is linear with a distinct change of the expansion coeffients for all axes above 400°C. The relative changes of the axes indicate a rearrangement of the structure towards cubic symmetry with increasing temperature. The transformation of GeSe from the orthorhombic to a normal NaCl-type structure is observed at 651 ± 5°C. The lattice parameter of the cubic form of GeSe is a0 = 5.730 ± 0.003 Å at 656°C. The GeSe lattice remains cubic up to the melting point. Die thermische Ausdehnung und die Hochtemperaturumwandlung des GeSe Die thermische Ausdehnung des GeSe wurde röntgenographisch mittels einer 190 mm Unicam Hochtemperaturkamera von Zimmertemperatur bis zum Schmelzpunkt von 670 ± 5°C untersucht. Die thermische Ausdehnung der kristallographischen Achsen ist linear mit einer betonten Änderung der Ausdehnungskoeffizienten aller Achsen oberhalb 400°C. Die relativen Änderungen der Achsen deuten an, daß sich die Struktur mit zunehmender Temperatur kubischer Symmetrie nähert. Die Umwandlung des GeSe von der rhombischen zur NaCl-Struktur erfolgt bei einer Temperatur von 651 ± 5°C. Die Gitterkonstante des kubischen GeSe ist a0 = 5,730 ± 0,003 Å bei der Temperatur 656°C. Die kubische Modifikation des GeSe ist bis zum Schmelzpunkt stabil." @default.
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- W2153442834 date "1975-01-01" @default.
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- W2153442834 title "The thermal expansion and high temperature transformation of GeSe" @default.
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- W2153442834 doi "https://doi.org/10.1002/zaac.19754110110" @default.
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