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. 2016 Oct 6;6:34765. doi: 10.1038/srep34765

Figure 4.

Figure 4

(a) The 3QZ MAS NMR spectrum of 10% B-TiO2−x recorded with a extremely short recycle delay of 3.0 ms (3QZ_3 ms). The 3QZ MAS NMR spectrum of 10% B-TiO2−x recorded with an adequate recycle delay of 2 s, is shown in Fig. 4a, insert, upper (3QZ_2 s). To selectively detect the signals with relatively large quadrupolar interactions, the 3QZ-FAM MAS NMR spectrum of 10% B-TiO2−x is recorded with an adequate recycle delay of 2 s and shown in Fig. 4a, insert, down (3QZ_2 s (FAM)). (b) Experimental (in black) and simulated (in red) 1D 11B MAS spectra together with the deconvoluted spectra corresponding to various B environments. (c) Spin-lattice relaxation (T1) curves extracted from saturation recovery T1 measurements for the different B sites in 10% B-TiO2−x. (d) Schematic illustration of the five B sites.