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Investigations on the existence of a high-temperature phase transition in ammonium sulphate crystals

✍ Scribed by M.A. Gaffar; S.M. El-Halwany; Galal A. Mohamed; M.A. El-Maghraby


Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
541 KB
Volume
193
Category
Article
ISSN
0921-4526

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## Abstract We investigated the effect of temperature on the absorption spectra of Zn~0.8~Li~0.2~O thin films (ZnO:Li), deposited at 573 K, in the wavelength range 190‐800 nm. The films were deposited on sapphire, MgO or quartz substrates by DC sputtering method. The results show a shift of the opt