Accession Number:

AD0650740

Title:

DIFFUSION IN ORGANIC CRYSTALS

Descriptive Note:

Semi-annual Technical Report, 1 Oct 1966-31 Mar 1967

Corporate Author:

FRANKLIN INST RESEARCH LABS PHILADELPHIA PA CHEMISTRY DEPT

Personal Author(s):

Report Date:

1967-03-31

Pagination or Media Count:

43.0

Abstract:

Further self-diffusion studies were carried out on anthracene crystals at high temperature. A comparison was made between crystals grown from the vapor, the melt and commercially supplied melt-grown crystals in which it was found that the secondary or fast diffusion process increased in the order vapor-grown melt-grown commercial melt-grown. A thorough investigation was made into the purity and perfection of a large melt-grown anthracene crystal. Segregation coefficients were obtained for hole and electron traps introduced by thermal decomposition in the melt. An exhaustive study was made on the growth of anthracene crystals from the vapor phase as a function of purification technique, ambient growth atmosphere, growth temperature, supersaturation and the effect of light. The best crystals obtained by this technique gave carrier lifetimes a factor of 5 lower than the best melt-grown crystals. An attempt was also made to examine the physical substructure of anthracene by electron microscopy.

Subject Categories:

  • Physical Chemistry
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE