Accession Number : AD0612384

Title :   NUCLEAR MMAGNETIC RESONANCE IN BORON TRIOXIDE AT ELEVATED TEMPERATURES,

Corporate Author : HARRY DIAMOND LABS WASHINGTON D C

Personal Author(s) : McDade,James C.

Report Date : 15 JAN 1965

Pagination or Media Count : 57

Abstract : The magnetic resonance of the B11 nucleus in vitreous boron trioxide was observed at 10 Mcps and at temperatures ranging from room temperature to 800C. The resonance line narrows with increasing temperature to about 600C, above which it broadens again. The narrowing below the glass-transition temperature T sub g is attributed to lattice vibrations; that above T sub g, to molecular rotation. The broadening above 600C is ascribed to the decrease in the life time of the energy states. Theory is given relating the line width to the molecular motion of the liquid. There is no evidence for a proposed change in molecular structure. (Author)

Descriptors :   (*NUCLEAR MAGNETIC RESONANCE, GLASS), (*BORON COMPOUNDS, OXIDES), (*GLASS, NUCLEAR MAGNETIC RESONANCE), HIGH TEMPERATURE, TRANSITION TEMPERATURE, NUCLEAR ELECTRIC MOMENTS, NUCLEAR SPINS, RELAXATION TIME, RADIOFREQUENCY SPECTROSCOPY, MOLECULAR STRUCTURE, CORRELATION TECHNIQUES, PERTURBATION THEORY, NUCLEAR ENERGY LEVELS, CHEMICAL BONDS, MOLECULAR PROPERTIES

Distribution Statement : APPROVED FOR PUBLIC RELEASE