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9.6 Raman Spectra of the High-Temperature Phase of Polycrystalline NaBF496

9.7 A New Method for Synthesis of NaBF3OH98

9.8 Solubility of BF3 Gas in Fluoride Melts98

9.9 Equilibrium Phase Relationships in the System RbF-RbBF4100

9.10 Activities in Alkali Fluoride-Fluoroborate Mixtures100

9.11 High-Temperature Crystal Structure and Volume of Sodium Tetrafluoroborate

and Related Compounds101

9.12 Hydrogen Permeation through Oxide-Coated Metals103

10. PHYSICAL CHEMISTRY OF MOLTEN SALTS107

10.1 Thermodynamics of LiF-BeF2 Mixtures from EMF Measurements of Concentration Cells107

10.2 Equilibrium Phase Relationships in the System LiF-BeF2-CeF3109

10.3 Electrical Conductivity of Molten and Supercooled NaF-BeF2 (40-60'Mole %)109

10.4 Glass Transition Temperatures in the NaF-BeF2 System110

10.5 Raman Spectra of BeF42- in Molten LiF and NaF to 686°C112

10.6 Bubble Formation by Impingement of a Jet Stream on a Fluid Surface115

10.7 The Solubility of Hydrogen in Molten Salt115

10.8 Enthalpy of UF4 from 298 to 1400K117

10.9 Absorption Spectroscopy of Molten Fluorides: The Disproportionation

Equilibrium of UF3 Solutions118

10.10 The Oxide Chemistry of Pa4+ in the MSBR Fuel Solvent Salt119

10.11 The Redox Potential of Protactinium in MSBR Fuel Solvent Salt120

10.12 The Crystal Structures of Complex Fluorides122

10.12.1 The Crystal Structure of CsU6F25122

10.12.2 The Crystal Structure of α-KTh6F25122

10.12.3 The Crystal Structure of Li2MoF6122

10.12.4 The Crystal Structure of RbTh3F13124

10.12.5 The Crystal Structure of Rb5Zr4F21125

10.12.6 Discussion125

10.13 Noncrystalline BeF2 at 25°C: Structure and Vibrational Motion125

10.14 Relationshic between Entropy and Sonic Velocity in Molten Salts126

10.15 A Reference Electrode System for Use in Fluoride Melts127

11. CHEMISTRY OF MOLTEN-SALT REACTOR FUEL TECHNOLOGY129

11.1 Extraction of Rubidium and Cesium from MSBR Fuel Solvent into Bismuth by

Reduction with Lithium at 650°C129

11.2 Distribution of Thorium between MSBR Fuel Solvent and Bismuth

Saturated with Nickel and Thorium at 650°C130

11.3 Bismuth-Manganese Alloys as Extractants for Rare Earths from MSBR Fuel Solvent131

11.4 Removal of Solutes from Bismuth by Fractional Crystallization131

12. DEVELOPMENT AND EVALUATION OF ANALYTICAL METHODS FOR

MOLTEN-SALT REACTORS134

12.1 Electroanalytical Studies of Titanium(IV) in Molten LiF-NaF-KF (46.5-11.5-42.0 Mole %)134

12.2 Reference Electrode Studies in Molten NaBF4135

12.3 Electrochemical-Spectral Studies of Molten Fluoride Salt Solutions136

12.4 Spectral Studies of Molten Fluoride Salts136

12.5 Analytical Studies of the NaBF4 Coolant Salt137

12.6 In-Line Chemical Analysis138

PART 4. MATERIALS DEVELOPMENT

13. EXAMINATION OF MSRE COMPONENTS139

13.1 Examination of a Graphite Moderator Element139

13.2 Auger Analysis of the Surface Layer on Graphite Removed from the Core of the MSRE143

13.2.1 Auger Electron Spectroscopy144

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