| 摘要 |
A MgO vapor deposition material, which is used to form a protective film of a plasma display panel, comprises pellets having MgO purity of 98% or more and relative density of 90% or more. The pellets contain only a Sc element as a rare earth element. The concentration of the Sc element is from 5 to 5,000 ppm, preferably from 10 to 3,000 ppm, and more preferably from 20 to 2,000 ppm.
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