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Neutron Diffraction Study of Ca0.8Bi1.2O2.6 with Anti-α-AgI Structure

✍ Scribed by K. Gruber; P. Hofer; M. Trömel; H. Fuess; M. Pinot

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
130 KB
Volume
108
Category
Article
ISSN
0022-4596

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✦ Synopsis

Powder neutron diffraction of (\mathrm{Ca}{0.8} \mathrm{Bi}{1.2} \mathrm{O}_{2.6}) at (8 \mathrm{~K}) reveals a pseudocubic order-disorder structure, space group (R 3 m, a=) (424.6 \mathrm{pm}) and (\alpha=90^{\circ}). The average structure is of anti- (\alpha-\mathrm{AgI}) type, space group (\operatorname{Im} 3 \mathrm{~m}). Bismuth and calcium atoms are randomly distributed in (2a) with (0,0,0), oxygen atoms in ((24 g)) with (x, 0), (\frac{1}{2}, x=0.322). Antiglass disorder was established by high Debye-Waller parameters at low temperatures and extremely broad bands in the Raman spectrum. O 1994 Academic Press, Inc.

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