Effect on the Properties of SiO_2 Nanoporous Transparent-Wave/Heat-Insulation Materials Doped With Al_2O_3

Al 2 O 3 doped SiO 2 nanoporous transparent-wave / heat-insulation materials were prepared by sol-gel method. The effects of Al2O3 to the thermal stability,dielectric and insulation properties were investigated. It was showed that the thermal stability enhanced by the doping of Al2O3,which hindered the sintering of SiO2 particles. The dielectric constant fits the Lichtenecker's equation. The influence of Al2O3 to the insulating properties was eliminated maximatily by multi-layer structure.