• Benoit Glorieux

Articles written in Bulletin of Materials Science

• Er3+–Al2O3 nanoparticles doping of borosilicate glass

Novel borosilicate glasses were developed by adding in the glass batch Er3+–Al2O3 nanoparticles synthetized by using a soft chemical method. A similar nanoparticle doping with modified chemical vapour deposition (MCVD) process was developed to increase the efficiency of the amplifying silica fibre in comparison to using MCVD and solution doping. It was shown that with the melt quench technique, a Er3+–Al22O3 nanoparticle doping neither leads to an increase in the Er3+ luminescence properties nor allows one to control the rare-earth chemical environment in a borosilicate glass. The site of Er3+ in the Er3+–Al2O3 nanoparticle containing glass seems to be similar as in glasses with the same composition prepared using standard raw materials. We suspect the Er3+ ions to diffuse from the nanoparticles into the glass matrix. There was no clear evidence of the presence of Al2O3 nanoparticles in the glasses after melting.

• Synthesis, structure and luminescence properties of phosphates A$_{1−3x}$Eu$_x$Zr$_2$(PO$_4$)$_3$ (A—alkali metal)

The solid solution row A$_{1−3x}Eu$^{3+}_x$Zr$_2$(PO$_4$)$_3$, where$A= Na$, K, Rb, Cs and x ranging from 0 to 0.25 was obtained by methods based on sol–gel processes in the presence of the salting-out agent, C$_2$H$_5$OH. The formation of phases of the structural type NaZr$_2$(PO$_4$)$_3$(NZP) and their crystallization in the crystal forms belonging to the space group$R\bar{3}c$($0 \le x \le 0.1$) and$P\bar{3}c$($x = 0.25$) were determined. Morphotropic transition occurred. Trivalent europium was included as a local probe. Its electric and magnetic dipole was used to characterize the substitutionrule and the localization of this cation in the structure, which is in agreement with the structural characterization. It appears that europium is located in the M1 and M2 sites as a function of the Eu$^{3+}\$ concentration.

• # Bulletin of Materials Science

Volume 44, 2021
All articles
Continuous Article Publishing mode

• # Dr Shanti Swarup Bhatnagar for Science and Technology

Posted on October 12, 2020

Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020