The Frank H. Spedding Award Address: Studies of Rare Earth Intermetallic Compounds and Rare Earth Hydrides.- Materials Preparation.- From Infinity to Zero and Back Again to Infinity (From Mixed Rare Earths to Ultrapure Metals to Pseudo-Lanthanides).- Determination of the Effective Segregation Coefficient of Oxygen in Terbium During Zone Refining.- Electrowinning of Gadolinium Metal Below 1,000°C.- Zone Refining of High Purity Ce and Gd Metals.- Intermetallic Compounds in R. E.(Al,Ga)2? and R. E.(Cu,Ga)2 Alloys.- Equilibrium Relations Among Magnetic Phases in Mischmetal Cobalt Systems.- Mixed Halide Phases in the Chloride-Iodide Systems of Lanthanum and Gadolinium.- Preparation and Purification of GdCl3.- Solid-State Reactions of Some Lanthanide Orthophosphates with Sodium Carbonate.- Preparation and Thermal Studies of a Cerium (III) Sulfite-Sulfate-Hydrate.- Synthesis and Characterization of RE (Se2O5)NO3·3H2O, a New Series of Rare Earth Compounds.- Coordination Chemistry.- Binding of Lanthanides and Actinides by Polyelectrolytes.- The Trend of the Eu3+-Ligand Bonding in Covalent and Ionic Rare-Earth Compounds.- Study of Complex Formation of the Lanthanides by Means of Fluorescence Spectroscopy.- Magnetic Circular Dichroism (MCD) of Lanthanides: Study of the Eu3+ Ion in Aqueous Solution.- Solvent Effects on Erbium Chloride Complexation Reactions.- Complexes of the Heavier Lanthanoid Nitrates with Crown Ethersl).- Spectra and Redox Photochemistry of Crown Ether Complexes of Lanthanides.- New Approaches to the Study of Lanthanide/Actinide Chloride - Aluminum Chloride Vapor Phase Complexes.- Effect of Temperature on the Stability of Fluoro aComplexes of the Rare Earth Elements in Fluorite Bearing Model System.- Stability Constants of Rare-Earth Complexes with Some Organic Ligands.- Crystal Field Parameters for Eu(III) in Lanthanide Perchlorates with Hexamethylphosphoramide (HMPA).- Solvation of Eu (III) and Tb (III) Ions in Anhydrous CH3CN and DMF.- Yttrium Purification by Solvent Extraction.- Trigonal Primastic Versus Octahedral Coordination: The Crystal and Molecular Structures of Dy{S2P(C6H11)2}3 and Lu{S2P(C6H11)2}3.- Structural and Solid State Chemistry.- Crystal Chemistry of the Europium Pnictides.- Absorption Spectrophotometric and X-Ray Diffraction Studies of NdI3, NdOI and SmI3.- Solid State Chemistry in the Fluorites and Its Influence on the Spectroscopy.- New Anion-Excess, Fluorite-Related Superstructure Phases in LnF2-LnF3, CaF2-YF3 and Related Systems.- Structural Chemistry of Ternary Metal Borides: Rare Earth Metal-Noble Metal-Brown.- The Crystal Structure of PrOHSO4.- Oxidation of Praseodymia in Ternary Rare Earth Oxide Phases.- The Trivalent Behavior of Cerium. Implications for Cosmochemistry and Thermodynamics.- The Structures of Na3Ln(XO4)2 Phases (Ln = Rare-Earth, X = P, V, As).- Investigation of the Reactions of RE + RE2O3 Under High Pressures.- Polymorphism of the Rare Earth Digermanates and Disilicates Under High Pressure and Information Given by the Eu3+ Structural Probe.- Correlation of Optical and Paramagnetic Properties of Neodymium (4f3) in the Solid State.- Disordered Cations in Pseudo Spinels FeR2S4 (R = Yb, Lu, Sc).- Twins in LaSe2 and LaSe2?x and a Phase Transition in LaS2.- Valence Instabilities and Superconductivity.- Mössbauer Spectroscopy on Superconducting and Mixed Valent Europium Compounds.- Pressure Temperature Behavior of the Electronic Transitions in Sm4Bi3.- Mössbauer Studies of Er0.5Mo6Se8.- Superconductivity in the Yttrium Sesquicarbide System.- Superconductivity in La-Y-Mn Alloys.- The Anomalous Physical Properties of RESn3 and (LaRE)Sn3 Compounds and Alloys.- Physical Properties of Elements and Alloys.- 4f and Band Contribution to the Samarium Form Factor in Samarium Intermetallics.- On Various Anomalies in the Temperature Derivative of Transport Properties in RE Metallic Compounds.- Martensitic Transformation and Magnetic Structures Between the Sm-Type and the HCP Structures in Tb-Light Rare Earth Alloys.- ?-Ray Emission from Oriented Nuclei in a Multiaxis Nuclear Spin System: 166mHo165Ho.- Mirror Properties of Rare Earths by Electrons and Positrons.- The Vickers Microhardness and Pendulum Hardness of Polycrystalline Lanthanide Dicarbides.- Intermetallics.- Crystal Chemistry of Rare Earth - Transition Metal Compounds.- Atomic Volume Contraction in Rare Earth Nickel Intermetallics as a Function of Partial Coordination Number Coefficient.- Comparison Between the Magnetic Properties of Crystalline and Amorphous Rare Earth Transition Metal Alloys.- Electric Field Gradients and Exchange Interactions in Amorphous RE4Au Alloys.- Magnetic Excitations in TbFe2.- Magnetic Structures of the Mn-Rich Y6(Fe1?xMnx)23 Compounds.- Magnetostriction in Some R6Fe23 Rare Intermetal1ic Compounds.- Transport and Magnetic Properties of the Gd(CoxNi1?x) Series (0 ? × ? 0.3).- Neutron Diffraction Study of Th2(Co,Fe)17.- Magnetic Behavior of TmAl2 at Low Temperatures.- Critical Behavior of Transport Properties in GdCd Compounds.- Magnetic Behavior of RCu4A1 (R = Rare Earth) Intermetallic Compounds II.- The Curie-Weiss Law and the Chemical Bond.- Magnetic Properties of Some Sm2?xRxCo17?yMny Intermetallic Compounds.- The Effect of an Yttrium-Oxide Dispersion on the Yield and ‘Memory’ Characteristics of Nitinol.- Semiconducting and Insulating Compounds.- Heat Capacities of Lanthanide Compounds, Their Morphology, Schottky, and Lattice Contribution.- Thermophysics of the Lanthanide Trihydroxides - Resolution of the Lattice and Schottky Contributions.- Thermophysics of the Lanthanide Trichlorides - Reanalysis of the Schottky Heat Capacity Contributionsa.- Magnetic Properties of the Pyrochlores (RE)2V2O7 (RE = Tm, Yb, Lu): New Ferro- and Ferrimagnetic Semiconductors.- Magnetic and Transport Properties of LaTiO3.- The Magnetic Structure of ErTiO3.- Magnetic Properties of Single Crystal NdF3 in the Liquid Helium Temperature Region.- Magnetic and Electrical Properties of the Rare Earth Oxynitrides Eu1?xNdxO1?xNx.- The Magnetic Structure of Ho11Ge8.75Si1.25, Determined by Neutron Diffraction.- Magnetic Susceptibilities of SmP, SmAs, SmSb, SmBi, and Their Solid Solutions with SmS.- Electrical Resistivity of (NdxGd1?x)3?y S4: Magnetic Effects.- Magnetic and Thermal Properties of Ce3?xS4.- Spectroscopy.- Refining the Parameters of the Refined Spin-Pairing Energy Description.- Resolution of Individual Electron Orbits for Solid State Atoms by Flux Quantum Analysis? Simple IIIB-Compounds and Phase Transition of Gadolinium (A3-A2).- Quasi Stationary States and the L? and L? Satellites of the Heavy Rare Earths.- Calculated Radiative and Nonradiative Transition Probabilities and Stimulated Cross-Sections of Selected Er3+ Lines in Oxide Glasses.- Eu-Rich EuO: Specific Optical Transitions.- Vibrational Spectra of Ternary Rare Earth Sulfides with CaFe2O4, Yb3S4, MnY2S4 and ZnGa2S4 Type Structures.- Group Theoretical Examination of the Far Infrared Spectra of Tm2 (SO4)3 • 8 H2O and TmCl3 • 6 H2O.- Radiative Transition Probabilities and Stimulated Cross- Sections of Nd3+ in 3Ga2S3•La2S3(GLS) and 3A?2S3•La2S3(ALS) Glasses.- Lanthanide Hydroxide Host Lattice Effects in the EPR Spectra of Gd3+ Ions.- Fluorescence and Phosphorescence Quenching of L-(?)-Tryptophan in DMSO by Eu3+.- Near Resonance Interactions Between Stark Components of the 6H5/2 and 4G5/2 States of Sm3+ in POCl3:SnCl4.- Oxidation of Cerium Studies by Photoelectron Spectroscopy.- Soft X-Ray Appearance Potential Spectroscopy of 70Yb.- Luminescence Processes in Nb-Doped YVO4.- Electroluminescence of Rare-Earth-Doped Cadmium Fluoride.- Sources and Applications.- Rare-Earth Permanent Magnets: Development Trends and Their Implications for the Industry.- The Diversity of Rare-Earth Mineral Deposits and Their Geological Domains.- Quality Control on an Industrial Scale at the La Rochelle Rare Earths Plant.- Trends in the Industrial Uses for Mischmetal.- Catalysis Using Rare, Earth Intermetallics.- The Hydrogenation of Ethylene over Lanthanum Transition Metal Perovskites.- A New Superionic Conductor: (LaO)AgS.- Stem Characterization of the Synthetic Rare Earth Minerals in Nuclear Waste “Supercalcine-Ceramics”.- Rare Earth Hafnium Oxide Materials for Magnetohydrodynamic (MHD) Generator Application.- Hydrides: Physical and Chemical Properties.- Magnetism of Hydrogenated Rare Earth Intermetallic Compounds.- Low Temperature Heat Capacity Studies on Hydrogen Absorbing Intermetallic Compounds.- Neutron Scattering Studies of Hydrides of the Laves Phase Rare Earth Compounds RFe2.- Kinetics of Desorption of Hydrogen from RFe2Hn Systems.- Decomposition Kinetics of Plutonium Hydride.- The Kinetics of Hydrogen Absorption by Rare Earth Intermetalics.- Thermodynamic and Structural Properties of LaNi5?xMnx Compounds and Their Related Hydrides.- The Effect of Group III A and IV A Element Substitutions (M) on the Hydrogen Dissociation Pressures of LaNi5?xM Hydrides.- Hydrogen Coordination Number, Volume, and Dissociation Pressure in LaNi5 Substituted Hydrides.- New Hydridic Rare Earth Compounds.- Lasers.- Suggestions for New Four-Level Lasers.- Magnetic Properties of the Mini-Laser Material: The Chloroapatite of Neodymium.- Necessary Numerical Criteria for Some Physical Properties of Low-Quenching Neodymium Materials.- Stark Level Identification of the 2.8 ?m Laser Transition in Er:YLF.- Dual Wavelength Laser Operation in Ho,Er:YLF.- Author Index.