Year: 2009
Type: article
Abstract: A polycrystalline Bi2(Te1-xSex)3 with variable composition x(where 0 ≤ x ≤ 1) has been prepared using Bridgman method. Thin films of theprepared alloys with different compositions were deposited onto ultra cleanglass substrates by the thermal evaporation technique. The as-depositedBi2(Te1-xSex)3thin films were investigated by electron scanning microscope(ESM), energy dispersive spectroscopy (EDAX) and X-ray diffraction (XRD) forsurface morphological, compositional and structural studies. X-ray diffractionstudy confirmed that the bulk materials with different compositions arepolycrystalline in nature having rhombohedral structure. The as-deposited filmshave amorphous structure but the films annealed at temperatures more than400 K are polycrystalline. The effect of selenium content and the thermalannealing on various structural parameters was also investigated. The thinfilms exhibit preferential orientation along the [015] direction for the filmsannealed at temperatures more than 400 K, together with other abundantplanes (101) and (110). Various structural parameters such as lattice constants,crystallite size, strain and density have been calculated and they are found to becompositional dependent.
Source: Egyptian journal of solids
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W4245984751