Talk:Barium borate
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It says in the introduction: "high-temperature α phase and low-temperature β phase" but in the first section: "the low-temperature alpha phase converts into the beta phase upon heating to 925 °C" My understanding is that the former is correct. Is that right? — Preceding unsigned comment added by Oliford (talk • contribs) 07:46, 15 February 2012 (UTC)
- Corrected, thanks (something got mixed up while merging two articles). Yes, beta is low-T phase. Materialscientist (talk) 07:56, 15 February 2012 (UTC)
Do you know if the α and β have the same indices and Sellmeier coefficients? We have different coefficients for α and β but the coefficients for β seem to match the behavior of some samples in our lab, which were ordered as α-BBO. The supplier insists that the indices are 'nearly' the same.
These are the coefficients I have from a few sources. n^2 = a1 + a2/(l^2 - a3^2) - a4*l^2.
Beta, from United Crystals: (These agree with our measurements, and we think we have α-BBO)
| a1 | a2 | a3 | a4 | |
|---|---|---|---|---|
| no | 2.7359 | 0.01878 | 0.01822 | 0.01354 |
| ne | 2.3753 | 0.01224 | 0.01667 | 0.01516 |
Alpha from AG Optics:
| no | 2.7471 | 0.01878 | 0.01822 | 0.01354 | |
| ne | 2.3753 | 0.01224 | 0.01667 | 0.01516 | <--- Looks like these are from Beta |
Alpha. I'm not sure of the original source for these, but they came to us via CMOD of MIT:
| no | 2.7471 | 0.01878 | 0.01822 | 0.01354 |
| ne | 2.3174 | 0.01224 | 0.01667 | 0.01516 |
Can anyone shed any light on this?
Oliford (talk) 05:22, 28 February 2012 (UTC)
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