Solids Congresses 22 Effect of radiation on 10 Materials 10 Thermal properties 9 Crystallography 8 Energy-band theory of solids 8 Optical properties 8 Electric properties 5 Semiconductors 5 Amorphous substances 4 Chemical reactions 4 Crystals 4 Heat 4 Magnetic properties 4 Spectra 4 Surfaces 4 Surfaces (Technology) 4 Bibliography 3 Chemistry, Physical and theoretical 3 Conduction 3 Defects 3 Diffusion 3 Electric conductivity 3 Electrons 3 Gases 3 Matter 3 Periodicals 3 Plasma (Ionized gases) 3 Quantum theory 3