NASA TN D-6980 APPLICATION OF THERMODYNAMICS TO SILICATE CRYSTALLINE SOLUTIONS
i FOREWORD iii ACKNOWLEDGMENTS v SYMBOLS ix 1 THERMODYNAMIC RELATIONS IN CRYSTALLINE SOLUTIONS 1 2 THERMODYNAMIC STABILITY OF A SOLUTION 11 3 COMPOSITION OF COEXISTING PHASES 15 4 MEASUREMENT OF COMPONENT ACTIVITIES BY ANALYSIS OF PHASE DIAGRAMS 25 5 MEASUREMENT OF COMPONENT ACTIVITY USING COMPOSITION OF COEXISTING MINERALS 35 6 ORDER-DISORDER IN Fe-Mg SILICATES 39
Cation distributions in multisublattice ionic crystals and applications to solid solutions of ferrimagnetic garnets and spinels
Abstract An equilibrium expression of cation transfer among oxygen-coordination lattice sites is given which takes into account the solid solution concentration parameters and the stoichiometric restrictions in multisublattice crystals. Some energy considerations are made about cation site preferences in ionic crystals. Ionic distributions in sublattices are inferred. Comparison of derived distribution expressions for some magnetic garnet and spinel solid solutions is made with experimental magnetic moments from literature.
Catalytic removal of tert-butyldimethylsilyl (TBS) ether by PVP-I
Abstract A mild, efficient and rapid protocol the deprotection of alcoholic TBDMS ethers using PVP-1 as catalyst in methanol, the procedure of deprotection of various TBDMS ethers were found to be very convenient, easy work-up, high yielding.