分散第二相γ-Al2O3对β-Li2SO4离子导电性的影响

本文研究了分散第二相γ-Al₂O₃对β-Li₂SO₄离子导电性的影响。β-Li₂SO₄(γ-Al₂O₃)的电导率随γ-Al₂O₃含量的增加而提高,到γ-Al₂O₃为50mol％时达到极大。当温度为253℃时,β-Li₂SO< 关键词：

EFFECT OF DISPERSED α-Al2O3 SECOND PHASE PARTICLES ON THE IONIC CONDUCTION OF β-Li2SO4

The effect of dispersed second phase particles of γ-Al₂O₃ on the ionic conduction of β-Li₂SO₄, has been studied. The electrical conductivity of β-Li₂SO₄ (γ-Al₂O₃) increases remarkably with the addition of γ-Al₂O₃. The maximum increment appears at about 50 mol%γ-Al₂O₃. The conductivity of β-Li₂SO₄ (50mol% γ-Al₂O₃) is four orders of magnitude higher than that of pure β-Li₂SO₄ at 253℃. On the other hand, the conductivity in α-Li₂SO₄ containing γ-Al₂O₃ decreases. The conductivity of β-Li₂SO₄ (γ-Al₂O₃) prepared in the condition of 70-80% relative humidity increases monotonically with γ-Al₂O₃ content. The additional small peaks of ⁷Li NMR absorption spectral in these specimens were found to be more obviously with the increasing of γ-A1₂O₃ content. The obsorption water layers on surfaces of γ-A1₂O₃ particles are responsible for this phenomina. It is also found that quenching of the sintered β-Li₂SO₄ (30mol%γ-A1₂O₃) pellet has evident effect on conductivity. The conductivity of quenched specimen is two orders of magnitude higher than that of the unquenched.