钠快离子导体Na_(1+x)Zr_(2-y)Ti_ySi_xP_(3-x)O_(12)系统的研究Ⅲ

STUDY ON FAST ION CONDUCTORS Na_(1+x)Zr_(2-y)Ti_ySi_xP_(3-x)O_(12) SYSTEM Ⅲ.

通过高温固相反应合成了Na_(1+x)Zr_(2-y)Ti_y,Si_xP_(3-x)O_(12)系统y=1,x=0-2.0的一系列合成物.其合成反应温度低于Zr-NASICON的合成温度.研究了系统的相变关系以及电导率、电导激活能与化学组成的关系.研究了系统合成物对水的稳定性.结果表明y=1.0,x=0.9的合成物的电导性能最好,对水的反应性也较小,其电导率在室温时为3.64×10^(-4)(Ω·cm^(-1)),在623K时为1.25×10^(-1)(Ω·cm)^(-1),其激活能为26.35kJ/molc(0.27cV)(473-673K).

Na1+xZr2_yTiySixP3-xO12(x = 0-2,y= 1) fast ion conductors were prepared by solid state reaction. The reaction temperature of the Ti-Zr-NASICON is lower than that of Zr-NASICON. The phase relationship has been identified by X-ray diffraction. The conductivities of Ti-Zr-NASICON were measured by a.c. impedance technique from 298K to 673K, the results showed that the best one is the initial composition with x = 0.9, y = 1.0, its conductivity is 1.25× 10-1(Ω · cm)-1 at 623K and its activation energy is 26.35kJ/ mo1c(473-673K).The reactivity with water for the Ti-Zr-NASTCON was investigated, Ac results indicated that the initial composition x = 0.9, y= 1.0 has lower reactivity with water.