ELECTRICAL CHARACTERIZATION OF Na&lt;SUB&gt;2&lt;/SUB&gt;O-CaO-P&lt;SUB&gt;2&lt;/SUB&gt;O&lt;SUB&gt;5&lt;/SUB&gt;-SiO&lt;SUB&gt;2&lt;/SUB&gt;-Al&lt;SUB&gt;2&lt;/SUB&gt;O&lt;SUB&gt;3&lt;/SUB&gt; GLASS
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