Thermal transformation of different halloysite types probed by in situ X-ray absorption spectroscopy
Yifan Pan·Erwan Paineau·Delphine Vantelon·Claire Goldmann·Alexandra Courtin·Pascale Launois·Emmanuel Joussein·Stéphan Rouzière
Halloysite (HAL) is a natural dioctahedral 1:1 clay mineral ubiquitous in soils and weathered rocks, where it occurs in a variety of particle shapes from cylindrical to prismatic nanotubes and occasionally spheroidal particles. Much less attention has been paid to the thermal transformation of halloysite than to its planar polymorph, kaolinite. This study investigates the morphological and structural variability of HAL samples from different geological sources and their thermal transformation be