17O solid-state NMR studies of oxygen-containing catalysts
Abstract Oxygen-containing catalysts have a broad range of applications, and it is important to understand the structure–property relationships of these materials. In the past 30 years, 17O NMR spectroscopy, which is sensitive to the local structure of oxygen, has been used to study various catalysts, including non-framework oxides, zeolites, heteropoly acids, layered double hydroxides (LDHs) and metal-organic frameworks (MOFs). The results from these studies have provided rich information on the structure and interactions of oxygen catalysts. This review summarizes significant progress in 17O solid-state NMR studies of oxides and related catalysts.
The lattice parameters in optical damage resistant crystal LiNbO3-In were measured for the first time using the X-ray powder method with an internal standard, which provides a high accuracy of the results. The lattice parameters vs. In concentration were obtained in the concentration range from 0.24 to 3.2 at % In in the crystal. The results are discussed in the framework of currently accepted model of the LiNbO3 intrinsic defect structure.