Post subject: Czochralski blue sapphire UV fluorescence
Posted: Mon Jan 09, 2023 3:25 am
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Joined: Tue Aug 16, 2022 6:13 pm Posts: 17
Does anyone happen to have some Czochralski available to test its LW/SW UV reaction, particularly blue?
I've googled a lot and can't seem to find much of anything about it. My initial guess would be similar to other melt processes (LW inert, SW chalky whitish blue/green) but just want to make sure.
Post subject: Re: Czochralski blue sapphire UV fluorescence
Posted: Mon Jan 09, 2023 1:39 pm
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Joined: Sun Oct 16, 2005 12:22 pm Posts: 21602 Location: San Francisco
The reaction you describe has been reported as diagnostic in Czochralski pink sapphires colored with titanium not chromium. (G&G Fall 1995, Dr. Mary Johnson) Blue? I find no specific information on that. Perhaps you can contact this vendor and ask: https://www.gemsngems.com/product-categ ... -sapphire/
Post subject: Re: Czochralski blue sapphire UV fluorescence
Posted: Wed Jan 11, 2023 3:51 am
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Joined: Tue Aug 16, 2022 6:13 pm Posts: 17
Mr Challener responded and said their Czochralski appears inert to UV, very interesting.
I'll keep my eye out for other people I can ask because gemstones.com lists the response as "Variable." Don't know if that's a generic placeholder or it will vary by manufacturer. I know most hydrothermal and a lot of flux are similarly inert.
After I discovered a blue sapphire that fluoresces red under LWUV I've been looking into these reactions
To be clear that was with a 365nm peak source. I will try with classic sw sometime. Titanium sapphire is fun. Its peak excitation and emission are shifted vs chromium sapphire, so it absorbs blue and emits a little red and (mostly) infrared
Post subject: Re: Czochralski blue sapphire UV fluorescence
Posted: Thu Jan 19, 2023 3:24 am
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Joined: Tue Aug 16, 2022 6:13 pm Posts: 17
Alright, I got it in today!
365nm LWUV: Inert.
254nm SWUV: Chalky bluish white, weak to moderate.
So it does respond similarly to flame fusion.
Fluorescence certainly isn't diagnostic, but LW inert / SW chalky blue or chalky green seems to be the rule of thumb for Verneuil, Czochralski, and flux.
Oh yeah I forgot to post my results. All my titanium sapphire did show chalky blue. My czochralski blue had zones of blue fluorescence but was mostly not very responsive.
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