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Tellurite And Fluorotellurite Glasses For Active And Passive

Tellurite And Fluorotellurite Glasses For Active And Passive

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7. Surface properties; MDO 292<br />

20 µm<br />

(a) 60 sec. (b) 120 sec.<br />

(c) 180 sec. (d) 240 sec.<br />

Fig. (7.25): Optical micrographs of glass MOD012 (75TeO2-10ZnO-10Na2O-5GeO2 mol.<br />

%), after (a) 60, (b) 120, (c) 180, and (d) 240 sec. immersion in a 3M solution of H2SO4<br />

at 15°C (all micrographs the same scale).<br />

Again, this etchant (H2SO4) was poor; however the etch was not as severe as the NaOH.<br />

Fig. (7.26) shows optical micrographs of glass MOD012 (75TeO2-10ZnO-10Na2O-<br />

5GeO2 mol. %), after 60, 120, 180, and 240 sec. immersion in a 1M solution of HCl at<br />

15°C (see section 7.1.2.1 for further experimental details).

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