Accession Number : AD0617573

Title :   NMR STUDIES OF HYDRATED SODIUM TETRABORATE MINERALS. II. NA 23 SITES IN BORAX AND TINCALCONITE,

Corporate Author : MCMASTER UNIV HAMILTON (ONTARIO)

Personal Author(s) : Cuthbert,J. D. ; Petch,H. E.

Report Date : 01 MAY 1963

Pagination or Media Count : 7

Abstract : The quadrupolar splitting of the Na23 nuclear magnetic resonance signal was studied in single crystals of borax, Na2B4O7.10H2O, and tincalconite, Na2B4O7.5H2O, placed in magnetic fields of 7536 and 5645 G, respectively. The resonance spectra show that the sodium atoms in both minerals occupy special positions with two unique sites in borax and three in tincalconite. The electric quadrupole coupling constants eqQ/h and asymmetry parameters at these sites were determined. The orientations of the principal axes of the electric field gradient tensors for these sites and their symmetryrelated sites were also determined. (Author)

Descriptors :   (*SODIUM COMPOUNDS, BORATES), (*BORATES, NUCLEAR MAGNETIC RESONANCE), (*SODIUM, NUCLEAR MAGNETIC RESONANCE), (*NUCLEAR MAGNETIC RESONANCE, BORATES), MINERALS, HYDRATES, SINGLE CRYSTALS, QUADRUPOLE MOMENT, SYMMETRY(CRYSTALLOGRAPHY), ELECTRIC FIELDS, TENSOR ANALYSIS, CANADA

Distribution Statement : APPROVED FOR PUBLIC RELEASE