Structural Study of Interlayer Zr Particles in Exchanged and Pillared Beidellite J. Miehé-Brendlé, L. Khouchaf, J. Baron and M.-H. Tuilier J. Phys. IV France, 7 C2 (1997) C2-951-C2-952 DOI: 10.1051/jp4:1997297