J. MATER. CHEM., 1994, 4(5), 775 CORRIGENDA Corrigendum to Effects of Sintering Conditions on Hydroxyapatite for Use in Medical Applications: A Powder Diffraction Study Isaac Abrahams, Department of Chemistry, Queen Mary and Westfield College, University of London, Mile End Road, London, UK El4NS, Jonathan C. Knowles, IRC in Biomedical Materials, Queen Mary and Westfield College, University of London, Mile End Road, London, UK El 4NS J. Mater. Chem, 1994,4,185. Please note that the footnote on p. 186 should read: t Supplementary data available (SUP 57007,40 pages); details from Editorial Office. Corrigendum to Preparation and Characterization of a Sodium Insertion Compound of Hydrogen Molybdenum Bronze, Na0.*5(H20)y[H0.21 MOO31 Kazuo Eda, Noriyuki Sotani, Department of Chemistry, faculty of Science, Kobe University, Nadu-ku, Kobe 657, Japan, Flumikazu Hatayama, School of Medical Sciences, Kobe University, Tomogaoka, Suma, Kobe 654-07, Japan, Masakazu Kunitomo, Toshiro Kohmoto, Department of Physics, Faculty of Science, Kobe University, Nadu-ku, Kobe 657, Japan J. Mater. Chem, 1994, 4, 205. Please note that the footnote on p. 205 should read: 1'Supplementary data available (SUP 57006, 2 pages); details from Editorial Office.