Composition dependence of the crystalline-to-amorphous phase transformation of vanadate compounds in the CdO-V2O5 binary system

By mixing different molar concentrations of V2O5 and CdO as reactants, and using the melt-quenching method, an evolution from crystalline vanadate compounds to amorphous materials was produced. For chemical compositions with high mol% of V2O5, crystalline phases with the sequence V2O5, CdV2O6, and C...

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Bibliographic Details
Published in:Journal of non-crystalline solids 2015-01, Vol.408, p.26-31
Main Authors: Aquino-Meneses, L, Lozada-Morales, R, Lopez-Calzada, G, Jimenez-Sandoval, S, Zayas, MaE, Zelaya-Angel, O, Becerril, M, Carmona-Rodriguez, J, Sanchez-Mora, E, Serrano, LE
Format: Article
Language:English
Subjects:
Amorphous materials
Concentration (composition)
Crystal structure
Diffraction
Evolution
Vanadates
Vanadium pentoxide
X-rays
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Summary:By mixing different molar concentrations of V2O5 and CdO as reactants, and using the melt-quenching method, an evolution from crystalline vanadate compounds to amorphous materials was produced. For chemical compositions with high mol% of V2O5, crystalline phases with the sequence V2O5, CdV2O6, and Cd2V2O7 were synthesized. On the other hand, high mol% of CdO led to the formation of amorphous materials. The identification of the crystalline and amorphous phases was carried out by X-ray diffraction and Raman scattering experiments. From optical absorption data, the optical band gap was determined with values between 1.97 and 2.83eV. Dark conductivity measurements from room temperature to 450K were made for the whole set of samples. In all cases thermally activated transport was observed. By scanning electron microscopy, depending on the mol% of the reactants, different morphological structures for each crystalline and amorphous material were recorded.
ISSN:0022-3093
DOI:10.1016/j.jnoncrysol.2014.10.008