Crystal Structural and Raman Vibrational Studies of
Bi_1-xSb_1-xTe_2xO₄ Solid Solution with 0 ≤ x ≤ 0.1

Leila Loubbidi^1*, Abdeslam Chagraoui¹, Imane Yakine¹, Brahim Orayech², Mohamed Naji^3,4, Josu M. Igartua², Abdelmjid Tairi¹

¹Laboratoire de Physico, Chimie des Matériaux Appliqués, Département de Chimie, Faculté des Sciences Ben M’Sik, Université HassanII, Mohammedia Casablanca, Morocco.
²Departamento de Física de la Materia Condensada, Universidad del País Vasco, Bilbao, Spain.
³CNRS, UPR3079 CEMHTI, Orléans, France.
⁴Faculté des Sciences, Université d’Orléans, Orléans, France.

DOI: 10.4236/oalib.1101180                

Abstract

Synthesis and crystal structures are described for the Bi_1-xSb_1-xTe_2xO₄ 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: R_p = 7.45%, R_wp = 10.6% and R_b = 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.

Keywords

BiSbO₄, TeO₂, Crystal Structure, Spectroscopy Raman

Conflicts of Interest

The authors declare no conflicts of interest.

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