title: Nuclear quadrupole coupling parameters and structural nature of the nonlinear optical material Li2B4O7 by NMR.
abstract: The structural nature underlying the nonlinear optical (NLO) properties of Li2B4O7 is characterized by nuclear magnetic resonance (NMR). The rotation patterns of (11)B NMR were measured. We observed sixteen different spectra which were divided into two groups, corresponding to two types of boron atoms, 4-coordinated B(1) and 3-coordinated B(2), which have different boron-oxygen rings and lie at chemically inequivalent sites. From these results, the quadrupole parameter and the principal axis of the electric field gradient (EFG) tensor were determined for the two borons.
authors.affiliation: Department of Science Education, Jeonju University, Jeonju 560-759, South Korea. Electronic address: aeranlim@hanmail.net.
authors.forename: Ae Ran
authors.initials: AR
authors.lastname: Lim
authors.affiliation: Electrics and Telecommunications Research Institute, Daejeon 305-700, South Korea.
authors.forename: In Gyoo
authors.initials: IG
authors.lastname: Kim
keywords: Boron; Li(2)B(4)O(7); NMR; Nonlinear optical material; Quadrupole parameter