Publication: Phase stability and properties of Bi6Te2O13+delta (delta=0 or 2)
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Advisor
Coadvisor
Graduate program
Undergraduate course
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Publisher
Elsevier B.V.
Type
Article
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Abstract
The crystalline Bi6Te2O15 and Bi6Te2O13 phases with orthorhombic and cubic symmetries, respectively, were synthesized by solid-state reaction synthesis. A study of the thermal stability of both phases was carried out, being verified that the high temperature cubic phase can be kept at room temperature in a metastable condition during long time. The Raman scattering spectrum, optical reflectivity and photoluminescence emission of these phases were measured for the first time. The optical band gaps E-g = 3.29eV, for the orthorhombic phase, and E-g = 3.08eV, for the cubic phase, were calculated from the reflectivity spectra. Using the brick-layer model the electrical conductivity of a dense ceramic of Bi6Te2O15 was measured, taking in account the grain and grain-boundary effects.
Description
Keywords
Bismuth tellurate, Bi6Te2O15, Bi6Te2O13, Cubic phase, Thermal stability
Language
English
Citation
Physica B-condensed Matter. Amsterdam: Elsevier, v. 605, 6 p., 2021.
