Portal de Periódicos da CAPES

Raman studies of lithium borophosphate glasses

1989; Elsevier BV; Volume: 112; Issue: 1-3 Linguagem: Inglês

10.1016/0022-3093(89)90510-3

1873-4812

JIN YI-FEN, Xiangsheng Chen, HUANG XI-HUAI,

Phase-change materials and chalcogenides

In the past few years, studies of the changes in Raman spectra and ionic conductivity in some glasses in silicate, borate and phosphate systems showed that the ionic conductivity of the glass was mainly dependent on the total number of active ions Li+ or Na+, but there was also an effect of the glass structure on conductivity. When Al3+ and/or B3+ ions were present in the glass in the form of AlO4 and BO4 and the excess negative charge on them was compensated by the active cation ion, the glass would have higher ionic conductivity. A detailed investigation of the Raman spectra of Li2OB2O3P2O5 glasses has shown that besides phosphate groups, such as metaphosphate (PO3)nn−, tetraphosphate (P4O13)6−, triphosphate (P3O10)5− and pyrophosphate (P2O7)4−,a nd borate groups, such as diborate (B4O7)2− and chain-type metaborate (BO2)−, there may also be different of kinds of phosphate groups containing BO4 units, (BOP)0 and (BOP)−, groups present in this glass system. The active ability of Li+ ions present in (B4O7)2–, phosphate groups with BO4 units and BO4 units and (BOP)− groups is higher than those present in various phosphate groups with non-bridging oxygen(s).