Here: http://www.allaboutcircuits.com/vol_1/chpt_11/1.html
It says that PbO2 is "Lead Peroxide" (Peroxide is R1-O-O-R2), which would mean that the structure is somewhat like
/ Pb \
O - O
and assumes that Pb is in (II), 2+ state... where in fact the structure is O = Pb = O, which means the Pb is in (IV), 4+ state... so this is "Lead(IV) oxide" or "Lead dioxide" so naming it Lead Peroxide is incorrect: there is no peroxide group in it.
Thou the validity of this could be of course argued (a lot of people actually use this name and similar less correct names - lead superoxide, see http://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=49854910&loc=ec_rcs) we can't overlook the definition of peroxide as "A peroxide is a compound containing an oxygen-oxygen single bond." (source: wikipedia). So saying Lead(IV) oxide or Lead dioxide is in all ways more acceptable.
It says that PbO2 is "Lead Peroxide" (Peroxide is R1-O-O-R2), which would mean that the structure is somewhat like
/ Pb \
O - O
and assumes that Pb is in (II), 2+ state... where in fact the structure is O = Pb = O, which means the Pb is in (IV), 4+ state... so this is "Lead(IV) oxide" or "Lead dioxide" so naming it Lead Peroxide is incorrect: there is no peroxide group in it.
Thou the validity of this could be of course argued (a lot of people actually use this name and similar less correct names - lead superoxide, see http://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=49854910&loc=ec_rcs) we can't overlook the definition of peroxide as "A peroxide is a compound containing an oxygen-oxygen single bond." (source: wikipedia). So saying Lead(IV) oxide or Lead dioxide is in all ways more acceptable.