Method for producing plasma display panel

A method for manufacturing a plasma display panel having a discharge space, and a protective layer confronting the discharge space, wherein

• the protective layer contains at least a first metal oxide and a second metal oxide, and has at least one peak in an X-ray diffraction analysis,
• the peak exists between a first peak of the first metal oxide in the X-ray diffraction analysis, and a second peak of the second metal oxide in the X-ray analysis,
• the first peak and the second peak show the same surface orientation as a surface orientation of the peak,
• the first metal oxide and the second metal oxide are two kinds selected from a group consisting of a magnesium oxide, calcium oxide, strontium oxide, and barium oxide,
• the method comprising:
• exposing the protective layer to the reducing organic gas by introducing a gas containing a reducing organic gas into the discharge space;
• exhausting the reducing organic gas from the discharge space;
• and
• enclosing a discharge gas to the discharge space.