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- W2040796554 abstract "Abstract Potassium borosilicate compositions with Q = SiO2/B2O3 = 0.3–2.3 in two series with R = K2O/B2O3 = 0.2 and 0.5 are studied by impedance measurements in the frequency range 101–106 Hz. The data are analysed by evaluation of the electrical modulus M ∗ based on the non-exponential relaxation function φ(t) = exp[−(t/τ0)b]. For the mean values of the relaxation times, 〈ln τ〉, and their standard deviations, D(ln τ), the parameters of the relations 〈 ln τ〉 = 〈 ln τ ∗ 〉−〈H ∗ 〉/RT and D( ln τ) = D( ln τ ∗ ) + D(H ∗ )/RT are determined. For R = constant the mean values of b are proportional to 〈 ln τ ∗ 〉 and D( ln τ ∗ ) but all three quantities are inversely proportional to the SiO2/B2O3 ratio, the non-bridging oxygen (NBO), and freely movable potassium ion concentration, respectively. For R = 0.5 far below Tg the values of b increase in proportion to the temperature but for R = 0.2 including the transition range the values of b decrease with rising temperature. The activation enthalpies Hκ0 and H〈τ〉 increase with rissing SiO2/B2O3 ratio in both series. D(H ∗ ) is in the range 0.03 ∗ )/〈H ∗ 〉 . For all six compositions the difference Hκ0 − H〈τ〉 is approximately D(H ∗ ) . Therefore a model is proposed that is characterized by an activation enthalpy profile of H 〈τ〉 ±D(H ∗ ) for the relaxation process and H κ 0 = H 〈τ〉 + D(H ∗ ) for the conduction process. 2D(H ∗ ) is regarded as the mean activation enthalpy of the reorientation process of potassium ions around an anion complex with NBO between non-equivalent positions of stability." @default.
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- W2040796554 date "1984-11-01" @default.
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- W2040796554 title "Effect of composition on electrical relaxation in potassium borosilicate glasses" @default.
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- W2040796554 doi "https://doi.org/10.1016/0022-3093(84)90002-4" @default.
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