prov:value
| - Specifically, it is preferred to make the lower auxiliary electrode 19 from a metal material such as Al or Al alloy, and make the upper auxiliary electrode 17 from a non-metal material such as silica, alumina, Si nitride, Cr nitride, Ta nitride or W nitride. [0147] The lower auxiliary electrode 19 and the upper auxiliary electrode 17 are made from, for example, Al and Cr, respectively, and Cr is e
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