“…5. This picture is characteristic for A 1−x B x C alloys with relatively small x [18]. In that way, we registered five lines the position and intensity of which depend on composition and temperature.…”
Section: Raman Spectra : Results and Discussionmentioning
“…5. This picture is characteristic for A 1−x B x C alloys with relatively small x [18]. In that way, we registered five lines the position and intensity of which depend on composition and temperature.…”
Section: Raman Spectra : Results and Discussionmentioning
“…It is seen that those of the coatings on zinc, cadmium, magnesium, and tin possess a narrow band centered, in the given order, at 253, 208, 255, and 212 cm -1 , whereas those of the coatings on Ag and Cu show a broad band respectively centered at ∼180 and ∼200 cm -1 . These features are to be discussed in terms of the well-known longitudinal optical (LO) mode in films of MgSe (252 cm -1 ), CdSe (210 cm -1 ), CuSe 2 (260 cm -1 ), CuSe (263 cm -1 ), ZnSe (254 cm -1 44 ), Ag 2 Se (100−200 cm -1 45 ), and SnSe 2 (135 cm -1 46 ) and of Raman spectrum of a-Se films that display a broad peak at ∼250 cm -1 47,48 ), mainly due to disordered Se chains and a shoulder at ∼235 cm -1 due to trigonal Se (t-Se) existing in a-Se. 5 Diffraction pattern of the deposited Se on Ag (a), Cu (b), Cd (c), Zn (d), and Sn (e) as compared with that of the metal, selenide, and selenium (diffraction patterns from XRD diffraction database 35 ).…”
Laser-chemical vapor deposition (LCVD) of elemental selenium onto the surface of several
metals (Ag, Cu, Cd, Zn, Mg, Sn) has been achieved using photolytic decomposition of diethyl
selenium, and the interaction between the deposited selenium coatings and the metal surface
has been examined by X-ray photoelectron spectroscopy, Raman spectroscopy, X-ray
diffraction, and electron microscopy. It is revealed that thin coatings of Se take part in a
solid-state chemical reaction with Ag, Cd, Cu, Mg, and Zn substrates and demonstrated for
the first time that the reaction between amorphous selenium and these metals (and not
only Cu) does not require high temperatures but takes place at room temperature. The results
reveal the feasibility of room-temperature selenization of metals.
“…The vibrational Raman spectra of Zn 1-x Be x Se mixed crystals for different Be content, obtained at room temperature were described in our previous work [14]. Raman spectra for ZnSe and Zn 1-x Be x Se crystals with x = 0.12 and x = 0.25 are shown in Fig.…”
The results of a study of Raman scattering of Zn 1-x Be x Se mixed crystals are reported. Raman measurements were performed for crystals with x = 0.12 and x = 0.25 Be at room temperature and liquid nitrogen temperature. From the Raman spectra the longitudinal optical and transverse optical modes which correspond to ZnSe-like and BeSe-like were distinguished. Theoretical calculations of frequencies of BeSe modes and force constants for Zn 1-x Be x Se were also performed using modified random element isodisplacement model. It has been shown that the dependence of the phonon energy on temperature may be described by the modified Klemens model.
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