In situ X-ray diffraction observation of two-step fullerene coalescence in carbon peapodsC. Bousige, S. Rols, E. Paineau, S. Rouzière, C. Mocuta, H. Kataura and P. LaunoisEPL, 103 6 (2013) 66002DOI: https://doi.org/10.1209/0295-5075/103/66002