Crystalline Aluminium Borates with the Mullite Structure: A 11B and 27Al Solid-State NMR Study

Characterization of the glass-to-vitroceramic transition in yttrium aluminum borate laser glasses using solid state NMR

“…These resonances can be attributed to the two fivefold coordinated aluminum sites. All isotropic chemical shifts and quadrupolar coupling parameters obtained by evaluating the TQ MAS NMR spectrum in the previously described manner are listed in Table 3, in good agreement with literature data, regarding previous 27 Al NMR measurements on samples denoted as Al 18 B 4 O 33 [31][32][33][34][35]. Based on these parameters the rather complicated MAS NMR spectrum can be simulated (Fig.…”

QuadFit—A new cross-platform computer program for simulation of NMR line shapes from solids with distributions of interaction parameters

“…The high field data allows information about the positions of any singularities whilst the low field data is very sensitive to the centre and width of distributions of the quadrupolar interaction. This is an example of atomic disorder with XRD data (especially powder data) finding it difficult to provide the distribution of the aluminium and boron over the different sites, whereas combined 11 B and 27 Al NMR data was effective at identifying the different sites and how their occupancy changes with composition [19].…”

“…27 Al MAS NMR spectra and simulations of mullite-structured Al 5 BO 9 at: (A) 8.45 T, (B) 14.1 T and (C) 18.8 T. For experimental details see[19].…”

Nanostructures from Zirconium Diboride and Alumina Ceramics

“…Based upon the literature, EDS, and FFT's of TEM images, the composition of the rectangular nanotubes appears to be zirconium‐rich boron‐mullite. The boron‐mullite structure can accommodate significant variation in composition, 46 especially under nonequilibrium conditions. The most similar nanostructures reported previously were single crystals of mullite 24 and aluminum borate 7,25,26 .…”