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With positron annihilation radiation onedimension angular-correlation device,it ismeasured that positron annihilation radiationone dimension angular-correlation curves ofpolycrystal sodium ion conductor Na_5Y_(1-x)Cr_xSi_4O_(12)(NYCS)system.After electronmomentum distribution curves arenormalized,linear parameters arecalculated.The parameters H,W and Sshow the change of Na~+ ion vacancyconcentration in NYCS series samples.Theresults show that parameters H,W and S ofone dimension angular-correlation curves ofthose samples vary greatly with Cr_2O_3contents.With Cr_2O_3 content increasing,Hand S parameters increase,but W decreases,and reaches extremes at x=0.05;then withCr_20_3 adding continually,parameters H andS decrease gradually,parameter W increasesgradually.This shows that,in addtion toCr_2O_3,the conductivity has close relation
With positron annihilation radiation on edimension angular-correlation device, it ismeasured that positron annihilation radiationone dimension angular-correlation curves of polycrystal sodium ion conductor Na_5Y_ (1-x) Cr_xSi_4O_ (12) (NYCS) system.After electronmomentum distribution curves are normalized, linear parameters arecalculated. The parameters H, W and Sshow the change of Na ~ + vacancy concentration in NYCS series samples. The results show that parameters H, W and S ofone dimension angular-correlation curves of substantially different sizes with Cr_2O_3contents.With Cr_2O_3 content increasing, Hand S parameters increase, but W decreases, and reaches extremes at x = 0.05; then with Cr_20_3 adding continually, parameters H and S decreasing gradually, parameter W increasesgradually.This shows that, in addtion toCr_2O_3, the conductivity has close relation