TITLE:
Crystal Structural and Raman Vibrational Studies of Bi1-xSb1-xTe2xO4 Solid Solution with 0 ≤ x ≤ 0.1
AUTHORS:
Leila Loubbidi, Abdeslam Chagraoui, Imane Yakine, Brahim Orayech, Mohamed Naji, Josu M. Igartua, Abdelmjid Tairi
KEYWORDS:
BiSbO4, TeO2, Crystal Structure, Spectroscopy Raman
JOURNAL NAME:
Open Access Library Journal,
Vol.1 No.9,
December
24,
2014
ABSTRACT: Synthesis and crystal structures are described for the Bi1-xSb1-xTe2xO4 solid solution with 0 ≤ x ≤ 0.1. It crystallizes in the monoclinic system, space group I2/c. Rietveld refinements of X-ray powder diffraction data indicate that the atomic positions are: Bi/Te(2)(4c), Sb/Te(1)(4d). The oxygen occupied two sites, 8f and 8b, respectively. The reliability factors are: Rp = 7.45%, Rwp = 10.6% and Rb = 3.88% for x = 0.1. The structure contains [(Sb/Te(1))O4]n layers formed by (Sb/Te(1))O6 octahedra sharing corners, which are parallel to (001) plan and held together by bismuth and tellurium atoms. The Raman study of this solid solution shows the bands which are assigned to O-Bi3+-O, O-Sb5+-O and connects (Bi/Te(2))O8-(Sb/Te(1))O6 vibration in the crystal.