| 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 one, or two or more kinds of elements selected from the group consisting of Y, La, Ce, Pr, Nd, Pm, and Sm. The concentration of Y is from 5 to 10,000 ppm in the case of containing Y, the concentration of La is from 5 to 15,000 ppm in the case of containing La, the concentration of Ce, Pr, Nd, Pm, and Sm is from 5 to 16,000 ppm in the case of containing Ce, Pr, Nd, Pm and Sm respectively.
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