Electrical conductivity and dielectric constant of samarium phosphate glasses
The first measurements of the d.c. electrical conductivity and the low-frequency (static) dielectric constant of samarium phosphate glasses (in the composition range 5 to 25 mol% Sm2O3) are reported. A break in the slope of the Arrhenius plot divides the conductivity data into two temperature regime...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Taylor & Francis
1989
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| Online Access: | http://psasir.upm.edu.my/id/eprint/39563/ http://psasir.upm.edu.my/id/eprint/39563/1/Electrical%20conductivity%20and%20dielectric%20constant%20of%20samarium%20phosphate%20glasses.pdf |
| Summary: | The first measurements of the d.c. electrical conductivity and the low-frequency (static) dielectric constant of samarium phosphate glasses (in the composition range 5 to 25 mol% Sm2O3) are reported. A break in the slope of the Arrhenius plot divides the conductivity data into two temperature regimes, the conductivity mechanism at low temperatures having a lower activation energy than that at higher temperatures. An increase of Sm2O3 glass modifier content results in a decrease in the absolute value of the conductivity. The data are consistent with small-polaron transport and hence small-polaron theory has been used to establish the characteristic energies of the carriers. The dielectric constants range from 5.4 for a glass containing 5mol% Sm2O3 to 8ยท1 for that with 2Smol% Sm2O3; the temperature dependences of the dielectric constants are linear and positive, as is usual for glasses. |
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