The mechanism of intercalation in high Tc superconductors is presented
and the microstructure of intercalated materials is studied by Raman
microspectroscopy for IBr in Bi2Sr2CaCu2O8 Presence of I2Br- is shown
and the results are in agreement with a P4/mmm structure. An increasin
g of Tc onset of 15 K is also found.