Accession Number : AD0715463

Title :   Magnetic Resonance Studies of the Structure of Glasses.

Descriptive Note : Final rept. 1 Jun 59-31 Aug 70,

Corporate Author : BROWN UNIV PROVIDENCE R I DEPT OF PHYSICS

Personal Author(s) : Bray,Philip J.

Report Date : DEC 1970

Pagination or Media Count : 6

Abstract : Nuclear magnetic resonance techniques have been used to study atomic arrangements and chemical bonds in glasses. The principal results are as follows: (1) NMR distinguishes between BO3 and BO4, configurations; quantitative measures of each configuration in the glass can be made. (2) The 'borate anomaly' is not related to the number of four-coordinated borons in the glasses. (3) BO3 units with all bridging oxygens can be distinguished from BO3 units with one or two nonbridging oxygens. (4) Lead-oxygen configurations in lead borate and lead silicate glasses have been determined as a function of the glass composition. (5) Vanadium-oxygen configurations in V2O5-P2O5 glasses, thallium-oxygen configurations in Tl2O-B2O3 glasses, and tellurium-oxygen configurations in TlO2-V2O5 glasses have been determined as a function of composition. (6) Local diffusion of alkali ions in glasses at or near room temperature have been discovered. (7) Theoretical analysis and computer programs have been devised to simulate NMR spectra for comparison with experimental spectra. (Author)

Descriptors :   (*GLASS, CHEMICAL BONDS), (*BORATES, *NUCLEAR MAGNETIC RESONANCE), LEAD COMPOUNDS, VANADATES, PHOSPHATE GLASS, DIFFUSION, IONS

Subject Categories : Ceramics, Refractories and Glass

Distribution Statement : APPROVED FOR PUBLIC RELEASE