Kinetic fragility and structure of lithium borophosphate glasses analysed by 1D/2D NMR.

The macroscopic and high temperature properties of lithium borophosphate glasses were determined in this contribution. Our data, obtained on 50Li2 O-xB2 O3 -(50-x)P2 O5 glasses, confirm a continuous and linear increase of the glass transition temperature with the B/P substitution but show a two-domain evolution of the kinetic fragility with a steep decrease in the low B2 O3 region (0 ≤ x ≤ 10) followed by a moderate increase for higher B2 O3 contents. In order to understand this different behaviour, the glass structure was investigated in detail using 1D and 2D11 B/31 P correlation solid state nuclear magnetic resonance. The local and medium orders of borate units were determined by 1D MAS-NMR, 2D11 B DQSQ- and11 B(31 P) D-HMQC NMR experiments. The latter NMR technique was also used to deeply interpret the 1D31 P MAS-NMR spectra. Altogether the data allow (i) highlighting of the presence of four borate and seven phosphate units, (ii) evaluation of the number of homopolar POP and mixed POB linkages, and (iii) contribute to a better understanding of the Tg and kinetic fragility evolution.