Alteration of Synthetic Fluor-tetrasilicic Mica[KMg_2.5(Si₄O₁₀F₂)] by NaB(C₆H₅)₄ Treatment

Abstract

Five speeies of hydreus mQlybdenum trioxide were prepared under various conditions and investigated by DTA, -TGA, X-ray diffractemetry, IR and NMR spectrometries to tsvet detailed infermations regarding structures and their thermal behaviors.
Th-ree ef these five hydrous oxides were confirmed to be hydrates of trioxide (yelEew dihydrate sample A, yellow monohydratet sample B and white menohydrate sample D). Sftinple A transformed te sample B at 105 C by liberating one moleeule of water. Sffmple B transf6rmed to MoOg, having a rhombie crystal structure, (rhombie MoOa) at 165 C by liberating residual one mQlecule of water, Sample D also transformed to rhombic MoOg threugh amerpheus trioxide and hexagonal MeOs by elevation of temperetture.
The remaining two were comfirmed tobetrioxide hydrous rhombic MoO3 sample C and hydrous hexagenal MeOs sample E, Sample C, which had a rhombic crystal stru6ture, svas Rrgpa.red by tre-ating sample A with hot water at about 70K fer several hours.lt was gradually dehyclrated byheating from room temperature to about 400C without any struetural transformation, Sgemple E, which had a hexagonal erystal strueture, x, vas prepared by the hydrelysis of pampatonium parenmelybdmte in 2N3 mole eseidic solution at about70eeC, lt wMs ulso dehydrated by heating frem room temperature to about 400C without showing any change in stiucture. Transfermthtion te rhembic MoOs toek plaeeat420di-w i30 C, This he agonal MoOi was newlyfound meta-stable exide, These two oxides were eonsidered to ceclude water in interstititil position of crystal lattice,