Characterization of Nd3+-doped Tellurite Glasses with Low OH Content

• Published in: Materials research (São Carlos, São Paulo, Brazil) São Paulo, Brazil), 2015-12, Vol.18 (suppl 2), p.2-7
• Main Authors: Costa, Francine Bettio, Yukimitu, Keizo, Nunes, Luiz Antonio Oliveira, Andrade, Luis Humberto da Cunha, Lima, Sandro Marcio, Moraes, João Carlos Silos
• Format: Article
• Language: eng ; por
• Subjects: Density; Differential thermal analysis; ENGINEERING, CHEMICAL; Formations; Glass; Hydrogen bonding; low OH content; MATERIALS SCIENCE, MULTIDISCIPLINARY; METALLURGY & METALLURGICAL ENGINEERING; rare-earth; Reduction; Thermal properties; Transformations; tungsten-tellurite glasses
• ISSN: 1516-1439; 1980-5373; 1980-5373
• DOI: 10.1590/1516-1439.320614

This work presents the results of the investigation of structural and thermal properties of Nd super(3+)-doped tellurite glasses with low OH content. The samples were characterized by XRD, FTIR, DTA, UV/VIS/NIR and Archimedes' method. Tellurite glasses of composition (100 - x)(0.8TeO sub(2)+ 0.2WO sub(3)) + x Nd sub(2) O sub(3)(x= 0, 0.05, 0.5, 1, 2, and 4 mol%) were prepared in both ambient and oxygen atmospheres. All samples showed an increase of the values of T sub(g), T sub(x), and T sub(x)-T sub(g) with Nd sub(2) O sub(3) addition. The reduction of OH content implies a slight decrease of T sub(g). The density and the molar volume of the glasses increased with Nd sub(2) O sub(3). The intensity of the absorption bands associated with Te-O bonds of TeO sub(4) units decreased compared with the bands associated with Te-O bonds of TeO sub(3+1/3) units. This indicates that Nd sub(2) O sub(3) favors the transformation of the TeO sub(4) groups in TeO sub(3) groups via TeO sub(3+1), increasing the NBOs and contributing to the formation of strongly hydrogen-bonded OH groups. The samples made in O sub(2) showed a reduction of 48% of "free" OH ions compared with the Amb ones.