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Tellurite And Fluorotellurite Glasses For Active And Passive

Tellurite And Fluorotellurite Glasses For Active And Passive

Tellurite And Fluorotellurite Glasses For Active And Passive

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8. Fibre drawing; MDO 344<br />

Fig. (8.9): ESEM micrograph of crystals near the surface in glass fibre of composition<br />

MOF005ii (70TeO2-10Na2O-20ZnF2 mol. %), mounted length-ways in epoxy resin, and<br />

cross-sectioned.<br />

It can be seen from this figure that most of the crystals were 10-20 µm from the fibre<br />

surface, and around 2 µm in diameter. There appears to have been three types of crystals<br />

present in the glass: (i) triangular, (ii) snowflake, and (iii) cross (can be more clearly seen<br />

in later figures). These could have been different crystalline phases, or the same, but<br />

different morphologies have arisen by artifact, thus after polishing, and this can give a<br />

false idea of orientation of the crystals in the glass.<br />

Fig. (8.10) shows an ESEM micrograph of the surface of the glass fibre of<br />

composition MOF005ii (70TeO2-10Na2O-20ZnF2 mol. %). The fibre was mounted on a<br />

carbon tab.<br />

Glass<br />

Crystals<br />

Fibre surface<br />

Epoxy

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