层状α-氢型磷酸氢锆混合二氧化硅的交流电导

1 引言无定形和多晶粉末层状α-水合磷酸氢锆是一种固体质子电解质.多晶粉末层状α-水合磷酸氢锆的电导率随结晶度的提高而明显降低,但是其电导表观活化能相同而和结晶度无关.电导主要是由质子沿着微晶的水合表面迁移所致.因此,增大水合表面有可能提高多晶粉末层状α-磷酸氢锆的电导率.α-磷酸氢锆的层状结构由层间的磷氧基形成氢键

Alternating Current Conductivity of α-Zirconium Phosphate Mixed with Fumed Silica in Hydrogen Form

α-layered zirconium phosphate was obtained by direct precipitation method. Composites formed by α-zirconium phosphate and fumed silica were prepared by dispersing predetermined molar ratios of polycrystalline α-zirconium phosphate and fumed silica in water. Admittance measurement of the samples was made in a sealed cell connected to a Hewlett Packard 4192A impedance analyzer in the frequency range from 5 Hz to 1 MHz. All of the samples with varing molar ratios of α-zirconium phosphate to silica at 60%, 40% relative humiditites have the same approximate Arrhenius activation energies, around 48 kJ·mol~(-1), that means the charge transport mechanism was maintained after mixing fumed silica into α-layered zirconium phosphate.