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Synthesis and Structure of Cobalt (II) Oxide Halides—Sr2CoO2X2 (X=Cl, Br)

✍ Scribed by Christopher S Knee; Mark T Weller

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
165 KB
Volume
168
Category
Article
ISSN
0022-4596

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✦ Synopsis

The first layered cobalt (II) oxide halides, Sr 2 CoO 2 Cl 2 and Sr 2 CoO 2 Br 2 , have been synthesized and their structures determined from Rietveld refinement of powder X-ray data. The materials are structural analogues of the K 2 NiF 4 cuprate phase Sr 2 CuO 2 Cl 2 , crystallizing in space group I4=mmm: The compounds contain CoO 2 square planes separated by SrX layers (X=Cl;Br). The bromide material displays the expected increase in cell dimensions, i.e., for Sr 2 CoO 2 Cl 2 , a ¼ 4:06251ð5Þ ( A, c ¼ 15:1251ð3Þ ( A and for Sr 2 CoO 2 Br 2 , a ¼ 4:08891ð7Þ ( A, c ¼ 16:4077ð4Þ ( A.

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