الفهرس | Only 14 pages are availabe for public view |
Abstract In the present ’Work the possible applications of a series of semiconducting calcium borate glasses containing ir-on oxide as memory and switching devices, as meta1-g1ass-meta1 devices, and as op t acaI mass memories are in’vestigated. The d. c. & a.c. electrlcal reslstivitles, dielectric constant, dielectric loss, and optlcal properties of the glass system are reported in order to reach concluslve conduction models of the system to apply it to interpret the behavior of the studied applications. The glass series contains different iron concentrations in the system of molar compositlon (70-x) B203 - 30 CaO-xFe203. The reported electronlC properties are measured from 770K to 8000K in the frequency range of 20 cIs to 900 MC/s. The optical absorption measurements are in the range 400 - 4000 cm (25- 2.5 ~m) at room temperature. The work has proved that our glass system is a semlconducting one, and that the glasses are electronlcally cond cting, The experimental results of the electronic properties support the idea of having the following models of conduction: al a hopping conduction mechanism, for the glasses containing less than 20 mole % Fe203, (b) a trap-llmited band conduction mechanism together wlth a hOPPlng conduction mechanism for the glasses having Fe203 mole % between 20 and 30%, (c) a diffusive conduccion mechanism together w~th a hopping conduction mechanism for the glasses containing more than 30 mole % Fe203, |