Structure and properties of solid La@C82 endofullerene polymerized under pressure 9.5 GPa and temperature 520–720 K

Polymeric structures on the basis of La@C 82 endofullerene were synthesized and investigated for the first time. Bulk samples of about 10 mg weight were obtained by static high-pressure-high-temperature treatment at 9.5 GPa and 520; 720 K. The structure of quenched samples was studied by powder X-ray diffraction and transmission electron microscopy. Several new crystalline structures were found and attributed to the formation of dimers, 2D- and 3D-polymeric structures. Magnetic susceptibility of synthesized samples was investigated in the temperature range 5-300 K.