Models and polyborazine precursors for boron nitride ceramics

Synthesis of Silylborazines and Their Utilization as Precursors to Silicon-Containing Boron Nitride⋆

“…A view of the molecule is shown in Figure 1 and selected bond lengths and angles are given in Table 1. As expected, the B 3 N 3 ring is planar and the (Me 3 Si) 3 Si group occupies an exo position bonded to B(1 [28] . The terminal BϪSi bond length, 2.097(4) Å , is somewhat unique.…”

Catalytic ammonolytic sol–gel preparation of a mesoporous silicon aluminium nitride from a single-source precursor

“…The sol-gel technique is an attractive approach for preparing micro/ mesoporous oxide materials as powders, membranes and filters with high purity and homogeneity due to its flexibility and low temperature preparation of sols and gels [3]. A number of sol-gel processes to prepare highly porous nonoxide ceramics have also been reported, e.g., boron nitride [4][5][6][7][8], metal (carbo)nitrides [9][10][11][12][13][14], silicon carbonitride [15][16][17][18][19][20][21] and boron carbonitride [22,23]. A sol-gel process in an ammono-system has been used to prepare polymeric boron-, titano-and tantalo-silazanes by controlled co-ammonolysis of the elemental alkylamides [24].…”

Anisotropic Hexagonal Boron Nitride Nanomaterials: Synthesis and Applications

“…BN aerogels formed by critical point drying of poly(2,4,6-borazinylamine) gels and heated to 1000 ºC exhibit low density, are highly porous, and have surface areas of ~400 m 2 /g [69]. Porous BN materials with surface areas of 437-712 m 2 /g also were generated using similar polymeric precursors [114][115][116]. 4 .…”