title: 11B nuclear magnetic resonance in boron-doped diamond.
abstract: This review summarizes recent results obtained by11B solid-state nuclear magnetic resonance (NMR) on boron-doped diamond, grown by the high-pressure high-temperature (HPHT) or chemical vapor deposition techniques. Simple single-pulse experiments as well as advanced two-dimensional NMR experiments were applied to the boron sites in diamond. It is shown that magic-angle spinning at magnetic fields above 10 T is suitable for observation of high-resolution11B spectra of boron-doped diamond. For boron-doped HPHT diamonds, the existence of the excess boron that does not contribute to electrical conductivity was confirmed and its11B NMR signal was characterized. The point-defect structures (B+H complexes and -B-B-/-B-C-B- clusters), postulated previously for the excess boron, were discarded and graphite-like structures were assigned instead.
authors.affiliation: National Institute for Materials Science, 3-13 Sakura, Tsukuba, Ibaraki, 305-0003, Japan.
authors.forename: Miwa
authors.initials: M
authors.lastname: Murakami
authors.affiliation: National Institute for Materials Science, 3-13 Sakura, Tsukuba, Ibaraki, 305-0003, Japan.
authors.forename: Tadashi
authors.initials: T
authors.lastname: Shimizu
authors.affiliation: National Institute for Materials Science, 3-13 Sakura, Tsukuba, Ibaraki, 305-0003, Japan.
authors.forename: Masataka
authors.initials: M
authors.lastname: Tansho
authors.affiliation: International Center for Materials Nanoarchitectonics, 1-2-1 Sengen, Tsukuba, Ibaraki, 305-0047, Japan.
authors.forename: Yoshihiko
authors.initials: Y
authors.lastname: Takano
keywords: 11B NMR; boron-doped diamond; two-dimensional NMR