アルカリ金属酸化物を含むホウリン酸塩ガラスの電気的性質と内部摩擦

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The internal friction, dynamic modulus of elastically (C') D. C. conductivity and dielectric properties in the glasses of 30 R_O-xB_2O_3-(70-x)P_2O_5 (R=Li,Na, K : x=0-70 mol%) system were measured. The temperature dependence of D. C. conductivity in 30 R_2O-xB_2O_3- (70-x) P_2O_5 system was described by the Rasch-Hinrichsen equation : σ= σ_0exp (-ΔH_<dc>/RT). The D. C. conductivity curve showed a maximum with a minimum activation energy at x=35 mol% when the same alkali oxide is contained. The D. C. conductivity was largest for Li followed by Na and then by K for a mixed borate content. The activation energy was smallest for K followed by Na and Li. The frequency at which the peak of dielectric loss appeared was lo west and increased for Na and K in the order started. The activation energy of dielectric loss was nearly equal to that of the D. C. conductivity. One or two internal friction peaks were observed in the temperature range from -100% to 350℃ at about 1 Hz. The peak at lower temperature was due to the motion of alkali ions, because the activation and the peak temperature changed with x in a way similar to those in the D. C. conductivity and dielectric loss. On the other hand, the peak at higher temperature was due to migration of non-bridging oxygen. The dynamic modulus of elasticity (G') on internal friction was calculated by considering the shape factor. G's in glasses of 30 Na_2O-xB_2O_3-(70-x) P_2O_5 were 1.5 to 4.0 GPa in the range x=0 to 70 mol%. G's showed a maximum at x=35 mol%. It was considered that BPO_4 unit analogous to SiO_2 were produced in the glass network.
1988-08-01

アルカリ金属酸化物を含むホウリン酸塩ガラスの電気的性質と内部摩擦

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