Abstract
Glasses with composition V 2 O 5 – BaO – MO – B 2 O 3 ( MO = SiO 2 , GeO 2 , P 2 O 5 ) were studied using AC impedance analyzer. The measurements show that conductivities increase with V 2 O 5 contents, and the P 2 O 5 containing glasses have higher conductivities. The electric modulus was analyzed based on the Kohlrausch–Williams–Watts (KWW) relaxation function, φ ( t ) = exp [ - ( t / τ 0 ) 1 - n ] . The exponent n increases with V 2 O 5 content. In addition, as the temperature approaches glass transition temperature, n increases with temperature. The results are interpreted in terms of Ngai's coupling model when applied to polaron conductivity relaxation.
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