Accession Number:

ADA426595

Title:

Laser Heated Gradient NMR Studies of Ceramic Liquids

Descriptive Note:

Final rept. Jun 2003-May 2004

Corporate Author:

ARIZONA STATE UNIV TEMPE DEPT OF PHYSICS

Personal Author(s):

Report Date:

2004-05-01

Pagination or Media Count:

8.0

Abstract:

We report progress in two areas of research on NMR of ceramic liquids the synthesis and characterization of new materials along La-monazite - aluminaCaO joins, and the 27Al NMR measurement of incoherent Al motions in aluminum-containing ceramic melts. The addition of La-monazite to molten alumina or to molten C12A7 produces an increase in tetrahedral bonding in the liquid, as evidenced by the change of 27Al chemical shift to higher 4-fold values. The increase is not as strong, however, as that produced by the addition of CaO itself. Rates of incoherent, diffusive motions of Al in molten alumina have been measured by pulsed gradient NMR, from melting to 2550 Centigrade, and found to be very high. They are attributable to bulk motions such as random thermal convection currents, but their origin remains an active area of study.

Subject Categories:

  • Properties of Metals and Alloys
  • Ceramics, Refractories and Glass

Distribution Statement:

APPROVED FOR PUBLIC RELEASE