Date: Fri, 12 Jan 2001 09:48:49 -0600 (CST)
From: Yvonne Leduc 
Subject: Re: low temp. measurements
To: standa.danis@atlas.cz
Cc: s.t.xtal_l@ill.fr

Dear Mr. Danis,

Cryoguard has a product that irreversibly changes colour at 4 low
temperatures between -40C to -120C.  You can read more on their website at:

www.cryoguard.com

What kind of material is in the product, I don't know, and it's probably a
secret.

Yvonne Leduc
Univ of Saskatchewan
Canada


>Dear coleagues,
>
>	I need help. I would like to check the temperature sensor in a
>low temperature chamber. Do you know any materials (metals or
>inorganics compound) with known low temp. behavior - temperature
>dependence of lattice constants or transitions at low T?
>
>Best Regards,
>
>Mr.S.Danis
>Physical and chemistry laboratory
>Glazura
>Roudnice nad Labem
>Czech Republic

Date: Fri, 12 Jan 2001 17:21:29 +0100
To: standa.danis@atlas.cz
From: Sax Mason [mason@ill.fr]
Subject: Re: low temp. measurements
Cc: s.t.xtal_l@ill.fr

Dear S Danis
some known single crystal phase transitions (some magnetic...)  are
U(iii) phosphide 22K & 125K
TbVO4 33K
MnF2 67.47
FeF2 78.38
KMnF3 81.88,91 & 187
KH2PO4 122.4K

Some  I have tested at ILL & I have literature references
For neutron single crystal - my interest - problem may be to get 
suitable sample.
For X-rays or powder, presumably easier.

Sax Mason