Selenium Xtal Structure?

B. DeBoer deboerbb at epix.net
Sun Jun 23 22:29:27 EST 2002


Nope, You can't do any better from the ICSD, at least up to the 2001/1
release. From a rather fast look at the ICSD entries, your Phys. Rev.
reference looks best for both Se & Te.  There was mention of crystals
grown from the vapor in vacuum or with iodine, so there are alternatives
to hot aniline. Unless your proposed Eotvos experiment requires paired
crystals of the same substance but opposite chirality (sorry, didn't
read it thoroughly), what amount a mass of stretched DNA fibers?

Uncle Al wrote:
> 
> Please post reply, or use the e-mail address listed at
> http://www.mazepath.com/uncleal/eotvos.htm
> 
> Uncle Al needs a modern, very small "R" x-ray crystal structure for
> gray selenium near ambient temp.  Is there anything better than
> 
> J. Phys. C 8 L445 (1975)
> J. Phys. Chem. Solids 35 1089 (1974)
> J. Appl. Cryst. 4 333 (1971)
> 
> e.g., in the ICSD?
> 
> I need the space group (152 or 154); a,b c unit cell dimensions; and
> the unit cell fractional x-coordinate (if y=0.0 and z=1/3 do not
> obtain, those too).
> 
> Thank you!
> 
> The same for tellurium would also be appreciated.
> 
> Phys. Rev. 16 4404 (1977)
> Acta Cryst. C 45(6) 941 (1989)
> 
> Can we do better?
> 
> --
> Uncle Al
> http://www.mazepath.com/uncleal/
>  (Toxic URL! Unsafe for children and most mammals)
> "Quis custodiet ipsos custodes?"  The Net!





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