Hi, all:
Did anyone test B content in Pyrex glass with EPMA?
Based on Pyrex data, the glass should have around 13% B2O3.
The B is peaked from a B standard, LED2 peak at 191.98 with around 2000 cps. However, at this B peak position, there is barely any counts for B in a pyrex glass (C coated). At 15 KV, 10 nA, and 10 seconds, the B counts are 68 on pyrex glass and peak scan from 180 to 210 can not find any peak.
The EPMA data for this pyrex glass is SiO2 79.5%, Al2O3 2.4%, and Na2O 3.9-4.2%, with total near 87% (both F and Cl are included in analysis, and B is not include in analysis). This is almost same as the reported pyrex code 7740 glass without B2O3.
Any suggestion? Is the B x-ray absorbed by anything in the pyrex glass?
Minghua Ren
UNLV geoscience
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