High-resolution Solid-state NMR Studies on Ceramics

Publisher Summary This chapter discusses the high-resolution solid-state nuclear magnetic resonance (NMR) studies on ceramics. Since chemical shift is the most important parameter in high-resolution solid-state NMR, almost all the works reviewed in this chapter are concerned with the local structures. Chemical shift parameters are the most important to identify the structural units. To extract the accurate values of the isotropic chemical shift, several techniques are used to narrow the resonance line. Various attempts have been made to establish empirical correlations between the chemical shifts and the structural parameters, especially Si-O-T angles, Si-O bond length, Si-T distances, cation-oxygen bond strengths, and group electronegativity. The chapter discusses the microstructures of highly refractory materials, most of which contain silicon (silicon carbide, silicon nitride, silica, etc.) and aluminum (alumina and related materials). Bioceramics are classified into bioinert and bioactive materials that are briefly discussed in this chapter.