Preparations and characterizations of novel graphite-like materials and some high oxidation state fluorine chemistry

摘要

Novel graphite-like materials, BC(sub x) (6>x(ge)3), have been prepared using BCl(sub 3) and C(sub 6)H(sub 6) at 800--1000C, and C(sub x)N (14>x(ge)5) have been synthesized using C(sub 5)H(sub 5)N and Cl(sub 2) at 680C--986C. Bulk and thin film characterization were used to study the structure and bonding in these solids. C(sub 8)K(NH(sub 3))(sub 1.1) was prepared by reacting C(sub 8)K with gaseous NH(sub 3). The carbon sub-lattice is hexagonal: a = 2.47 (Angstrom), c = 6.47 (Angstrom). The smaller a parameter and lower conductivity are attributed to smaller electron transfer from K to the conduction band solvation of K by NH(sub 3). A simplified liquid phase method for synthesizing Li-graphite intercalation compounds has been developed; synthesis of a lamellar mixed conductor, C(sub x)(sup +)Li(sub 2)N(sup (minus)), has been attempted. Stability and conductivity of (BN)(sub 3)SO(sub 3)F have been studied; it was shown to be metallic with a specific conductivity of 1.5 S(center dot)cm(sup (minus)1). Its low conductivity is attributed to the low mobility of holes in BN sheets.