Pyrolytical boron nitride as a window material for high power microwave electron devices

The leading manufacturers of the vacuum microwave devices use alumina and beryllia ceramics as the main materials for the input-output window barriers. At present, aluminum nitride is considered as a possible alternative to these traditional materials. Meanwhile a well-known pyrolytical boron nitride (PBN) seems to be a material, which remains underestimated by the major part of ED developers. Some of its principally substantial properties are shown in the table in comparison with the properties of the materials mentioned above and CVD diamond.