Pure diamond should do the trick. Or you could try: High-Quality Carbon-Doped Boron Nitride Membrane for X-Ray Lithography Mask
Akihiko Kishimoto, Masahiko Sakakihara1, Tetsurou Kawai1, Hiroaki Oizumi, Shinji Kuniyoshi2, Sadae Yamaguchi3 and Kozo Mochiji Central Research Laboratory, Hitachi, Ltd., Kokubunji, Tokyo 185 1Magnetic and Electronic Materials Research Laboratory, Hitachi Metals, Ltd., Kumagaya, Saitama 360 2Semiconductor Design and Development Center, Hitachi, Ltd., Kodaira, Tokyo 187 3Institute for Materials Research, Tohoku University, Sendai, Miyagi 980 (Received December 14, 1991; accepted for publication March 26, 1992) Carbon-doped BN (BNC) membrane was fabricated by low pressure chemical vapor deposition (LPCVD) at a high temperature (750°C). Here, CH3NH2 was used as the reactive gas instead of NH3. The newly developed BNC has tensile stress and is transparent to visible light. A very small hydrogen content (3.3%) leads to the construction of strong atomic networks of B, N, and C, as well as to highly improved radiation stability. On Sat, Jun 5, 2010 at 5:43 PM, James Holton <[email protected]> wrote: > Several people now have pointed me to the "special glass" capillaries > available from Hampton, Charles Supper, and apparently manufactured by > Hilgenberg. > http://hamptonresearch.com/product_detail.aspx?cid=19&sid=110&pid=323 > http://www.charles-supper.com/en/page/product.cfm?idProduct=15 > http://www.hilgenberg-gmbh.com/en/products/mark-tubes/?0= > The last web page mentions that their glass type 0140 is "Lindemann glass". > However, Richard Gillilan was erudite enough to find the composition of > "Lindemann glass" in the "Glass Engineering Handbook" (E. B. Shand): > 82.1% B2O3, 15.3% LiO2, and 2.6% BeO. > > And by my calculations the attenuation coefficient of this stuff should be > 21.8 and 2.4 cm^-1 at Cu K-alpha and Mo K-alpha (respectively) assuming it > has the density of B2O3 (~2.5). This is a lot lower than the values quoted > for Hilgenberg's "0140" glass on their website: 97.4 and 10.5 cm^-1, which > could only be explained if the glass density was ~11 g/cm^3 (about that of > metallic lead). > > So, I think either the data on the glass are misquoted or the stuff > Hilgenberg is selling is not actually the "Lindemann glass" that Richard > found. > > I inquired with one glass manufacturer if they could make it, but they came > back that they didn't want to touch anything with "Be" in it, even at 2.6%. > Not sure how they feel about emeralds.... > > Nevertheless, it looks like "true" Lindemann glass is relatively soluble in > water, so it will not make for the good x-ray transparent, optically > transparent and water-tight window I had hoped. > > -James Holton > MAD Scientist > > James Holton wrote: >> >> Does anyone know the formula or supplier of what was once called >> "Lindemann glass"? It is a silicon-free high-boron glass that has no >> elements in it heavier than oxygen. Used to be used to make clear x-ray >> windows, but now I can't find anyone who sells it. >> >> -James Holton >> MAD Scientist >
