The phosphosilicate gels derived from the mixture of 2-(diethoxyphosphoryl)
ethyltriethoxysilane (DPTS) and tetraethoxysilane (TEOS) showed a high prot
on conductivity after a heat treatment at 450 degreesC. The high conductivi
ty was brought by the generation of large amounts of isolated orthophosphor
ic acid in the gels due to the thermal decomposition of DPTS.