高岭石和NaZr_2P_3O_（12）为基的矿物快离子导体

Mineral Fast Ion Conduetors Based on the Kaolinite and NaZr 2P 3o 12

利用天然矿物高岭石为原料，采用高温固相应制备了Ｎａ１＋２ｘＡｌｘＺｒ２－ｘＳｉｘＰ３－ｘＯ１２系统的矿物快离子导体材料．Ｘ射线衍射表明，该材料具有Ｎａｓｉｃｏｎ型的骨架结构，２９８～６７３Ｋ离子电导率为００１～１ｍＳ／ｃｍ，激活能４０５３～５２１１ｋＪ／ｍｏｌ，当ｘ＝０５时呈现最高电导率，在６７３Ｋ时其电导率达到２５ｍＳ／ｃｍ。

Natural mineral kaolinite has been used as a starting material for the preperation of mineral fast ion conductors of Na 1+2x Al xZr 2-x Si xP 3-x O 12 system by high temperature solid phase reaction,X-ray diffraction analysis indicates that the above mineral fast ion conductors possess the framework structure like Nasicon.The conductivities and activation energies are measured by AC impedance technique from room temperature to 673K.The results show that the best one is the initial composition x=0 5,i.e.Na 1+2x AlxZr 2-x Si xP 3-x O 12 with the conductvity of 2 5mS/cm at 673 K and its activation energy is 40 53J/mol.There are 0 01～1mS/cm of conductivities and 40 52～52 11kJ/mol of activation energies for the most compositions of Na 1+2x AlxZr 2-x Si xP 3-x O 12 system at the temperature of 298～673K.