SPIN NETWORKS CAMPO CRISTALINO 1 COUPLING CONSTANTS 1 CRISTALES 1 CRYSTAL FIELD 1 CRYSTALS 1 Calculation of the spin-lattice coefficients of Gd3+ in caF2 using a point-charge model for the crystalline fieId 1 ELECTROMAGNETIC FIELDS 1 ELECTRON SPIN RESONANCE 1 HAMILTONIANS 1 IONIC CRYSTALS 1 Interacción spin-red en iones de tierras raras 1 MECANISMO DE BLUME-ORBACH 1 PARAMAGNETIC RESONANCE (ELECTRON) 1 RARE EARTHS 1 RED DE ESPÍN 1 REDES DE SPIN 1 RESONANCIA PARAMAGNETICA (ELECTRON) 1 STRESS ANALYSIS 1 STRESS INTENSITY FACTORS 1 Second and fourth order spin-lattice coefficients for Gd 3+ in theoria 1 Temperature dependenc:e of the spin-lattic:e interaction for Gd3+ in CaF2 and CdF2 1