use of metal templates for microcavity formation in alumina
use of metal templates for microcavity formation in alumina
use of metal templates for microcavity formation in alumina
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Al2O3<br />
Figure 4.17. SEM micrographs <strong>of</strong> cross section <strong>of</strong> alum<strong>in</strong>a (CT3000SG ) sample<br />
conta<strong>in</strong><strong>in</strong>g Ti wire. Notice the diffusion <strong>of</strong> Ti +4 from top to bottom away<br />
from the wire <strong>in</strong>to the bulk <strong>of</strong> alum<strong>in</strong>a. The amount <strong>of</strong> porosity <strong>in</strong>creases<br />
from bottom to top due to Kirkendal effect. An <strong>in</strong>termediate phase <strong>of</strong><br />
Al2TiO5 <strong>for</strong>med <strong>in</strong> the middle.<br />
Figures 4.18, 19, 20, 21 and 22 displays belong to the EDS l<strong>in</strong>e analysis results<br />
<strong>of</strong> the different alum<strong>in</strong>a samples conta<strong>in</strong><strong>in</strong>g Ti wire. As can be seen from Figure 4.15 ,<br />
EDS l<strong>in</strong>e analysis <strong>of</strong> samples occurred <strong>in</strong> a flat l<strong>in</strong>e from A to B. Accord<strong>in</strong>g to EDS<br />
analysis, it is observed that Al is present as Al2O3, Ti is present as TiO2 and the<br />
compound <strong>for</strong>med between the two is Al2TiO5 (pseudobrookite structure).<br />
Accord<strong>in</strong>g to EDS analysis <strong>of</strong> these samples, firstly, the concentration pr<strong>of</strong>ile <strong>of</strong><br />
Ti is higher than that <strong>of</strong> Al. Dur<strong>in</strong>g s<strong>in</strong>ter<strong>in</strong>g, due to Ti +4 ions diff<strong>use</strong>s <strong>in</strong>to Al2O3 and<br />
the concentration pr<strong>of</strong>ile change <strong>in</strong> the opposite direction. Secondly, the concentration<br />
content <strong>of</strong> Al is higher than Ti.<br />
Al2TiO5<br />
TiO2<br />
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