Abstracts Book - IMRC 2018

• SC2-P019
DEVELOPMENT OF SAMARIUM-DOPED BOROSILICATE GLASSES
OBTAINED BY THE SOL-GEL METHOD
Eli Emmanuel Campos Zuñiga 1 , José Luis Rodríguez Galicia 1 , Ivonne Alonso Lemus 2 , José
Escorcia García 3
1
Centro de Investigación y de Estudios Avanzados del IPN - CINVESTAV Unidad Saltillo,
Ingeniería Cerámica, Mexico. 2 CONACYT, Cinvestav Unidad Saltillo., Sustentabilidad de los
Recursos Naturales y Energía, Mexico. 3 CONACYT, Cinvestav Unidad Saltillo, Ingeniería
Cerámica, Mexico.
In recent years different materials have been studied for the development of
novel solid-state white lighting (SSWL) devices since these have desirable
features such as: i) high efficiency, ii) high durability and stability, and iii) the
features of the emitted light can be controlled with high precision. Among these
materials we can find the glasses which are amorphous, transparent, isotropic,
chemically stable and mechanically durable. Furthermore, glasses can support
high amounts of doping species (transition metal and/or rare earths) into their
reticular structure, being good candidates to use them as host materials for
SSWLs. One of the glasses used for this purpose is the borosilicate since it
combines two types of network formers, silicate and borate, which improve its
stability and high solubility of the doping species. Moreover, these materials can
be obtained by melting-quenching or by low-temperature chemical synthesis
such as the sol-gel method.
In this work is presented the fabrication of Sm-doped borosilicate glasses
obtained by the sol-gel route. The synthesis is based on Si and B alkoxide
precursors, i.e. tetraethyl orthosilicate and trimethyl borate, mixed in different
molar ratios of B/Si using ethanol as mutual solvent. Then, samarium nitrate,
water and HCl is added under agitation to carry out the doping, hydrolysis and
condensation reactions. The gelation process is promoted by two different
routes, in acid and basic media. By doing this, the samples gelled after 1 day in
both routes. Then, the gels are dried in air during 1 week after which transparent
and crack-free monoliths are obtained. The resulting monoliths are annealed in
atmospheres of oxygen, hydrogen, and nitrogen to promote their activation and
densification after which the Sm-doped borosilicate glasses are obtained. The
XRD analysis shows that Sm-doped borosilicate glasses are amorphous. The
analysis by means of SEM and XPS confirms the presence of Si, B, and Sm. The
TGA-DSC results show that the increase of B/Si ratio decreases both the Tg and