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The macroscopic and high temperature properties of lithium borophosphate glasses were determined in this contribution. Our data, obtained on 50Li 2 O-xB 2 O 3 -(50-x)P 2 O 5 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 B 2 O 3 region (0 ≤ x ≤ 10) followed by a moderate increase for higher B 2 O 3 contents. In order to understand this different behaviour, the glass structure was investigated in detail using 1D and 2D 11 B/ 31 P correlation solid state nuclear magnetic resonance. The local and medium orders of borate units were determined by 1D MAS-NMR, 2D 11 B DQSQ- and 11 B( 31 P) D-HMQC NMR experiments. The latter NMR technique was also used to deeply interpret the 1D 31 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 T g and kinetic fragility evolution.

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