The Design, Syntheses, and Application of Group 13 Molecular and Polymeric Precursors to Advanced Ceramics

2002 ◽  
pp. 168-180
Author(s):  
Mark J. Pender ◽  
Kersten M. Forsthoefel ◽  
Larry G. Sneddon
Keyword(s):  
Advanced Ceramics ◽  
Group 13 ◽  
Polymeric Precursors

Development of Crystallinity in Turbostratic Boron Nitride Derived from Polymeric Precursors

1991 ◽  
Vol 49 ◽  
pp. 954-955
Author(s):  
X. Qiu ◽  
A. K. Datye ◽  
T. T. Borek ◽  
R. T. Paine
Keyword(s):  
Thermal Treatment ◽  
Boron Nitride ◽  
Diffraction Pattern ◽  
Polymeric Precursors ◽  
Polymer Precursors ◽  
Diffuse Ring

Boron nitride derived from polymer precursors is of great interest for applications such as fibers, coatings and novel forms such as aerogels. The BN is prepared by the polymerization of functionalized borazine and thermal treatment in nitrogen at 1200°C. The BN powders obtained by this route are invariably trubostratic wherein the sheets of hexagonal BN are randomly oriented to yield the so-called turbostratic modification. Fib 1a and 1b show images of BN powder with the corresponding diffraction pattern in fig. 1c. The (0002) reflection from BN is seen as a diffuse ring with occational spots that come from crystals of BN such as those shown in fig. 1b. The (0002) lattice fringes of BN seen in these powders are the most characteristic indication of the crystallinity of the BN.

Special Interest Group 13 (Swallowing and Swallowing Disorders)

ASHA Leader ◽  
2012 ◽  
Vol 17 (5) ◽  
Author(s):  
Debra Suiter ◽  
Laurie Sterling ◽  
Lynne Brady Wagner
Keyword(s):  
Interest Group ◽  
Special Interest ◽  
Swallowing Disorders ◽  
Special Interest Group ◽  
Group 13
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