By Norman Brown, Mark F. Parrish (auth.), Adli Bishay (eds.)
ISBN-10: 1461345383
ISBN-13: 9781461345381
ISBN-10: 1461345405
ISBN-13: 9781461345404
It is mostly permitted that. fused BZ03 consists of B0 three triangles. those triangles are joined togetner randomly, forming l the glass community. I.R. reviews and x-ray diffraction stories on natural BZ03 glass indicated truly that those triangles are joined jointly forming boroxole teams. those teams are joined jointly forming the random community. it's also authorised that addition of alkali oxides to boron oxide ends up in a glassy community in \
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Extra info for Recent Advances in Science and Technology of Materials: Volume 2
Example text
W. PARKINSON, M. J. KELLY, AND I. O. SALYER whether the decreasing apparent conductivity following irradiation is actual charge transport by mobile charge carriers or merely reorientation of radiation-generated dipoles similar to the dielectric polarization prior to exposure to ionizing radiation. Furthermore, if post-irradiation conductivity is true charge transport, is the nature of the mobile carriers ionic or electronic? Both of these questions can be answered by the behavior of the apparent conducivity upon removing (short circuiting), and reversing the applied potential, and by repeated measurements.
The measured capacitance of the specimens, C, was used with the apparent resistance, derived from the amplifier output, Rx, 32 W. W. PARKINSON, M. J. KELLY, AND I. O. SALYER to calculate the conductance-capacitance ratio, Elc, and Elc = llRxC = crlee o • Then the apparent conductivity of the specimen, cr, can be calculated by multiplying Elc by the product of the dielectric constant, e, and the permittivity of space, eo. 1 x 10-13 f/cm. In the measurement of specimens both before and after irradiation, the apparent conductance decreases with time owing to dielectric polarization.
GEN. CONDUCTION ~ AT 92,000 ~, ~ " , -7 10 TIME (sec) Fig. 3. Typical Behavior of Conductivities of High-Purity Polystyrene Upon Short Circuiting or Reversing Applied Potential. 38 W. W. PARKINSON, M. J. KELLY, AND I. O. SALYER lower radiation--generated conduction made it difficult to discern the decayed radiation-induced conductivity superimposed upon the initial dielectric charging. If the post-irradiation conductivity were dielectric charging of radiation-generated polar species, the apparent conduction upon reversal of applied potential at 90,000 sec would be approximately twice the initial value of post-irradiation conduction, unless a decrease or decay of dipoles is assumed.
Recent Advances in Science and Technology of Materials: Volume 2 by Norman Brown, Mark F. Parrish (auth.), Adli Bishay (eds.)
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