Editor:C. N. R. Rao (Nehru Centre for Ad Research, C. N. R. Rao, Achim Müller, Anthony K. Cheetham, India) Rao, C. N. R. (Nehru Centre for Advanced Scientific Research, Bangalore, Germany) Muller, Achim (Department of Inorganic Chemistry, University of Bielefeld, USA) Cheetham, Anthony K. (Materials Research Laboratory, University of California, Santa Barbara