AgCuO2—Synthesis, Crystal Structure, and Structural Relationships with CuO and AgIAgIIIO2

✍ Scribed by J. Curda; W. Klein; M. Jansen

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 401 KB
• Volume: 162
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2001.9255

✦ Synopsis

The new silver cuprate AgCuO 2 was synthesized by applying a low-temperature route. AgCuO 2 precipitates as a microcrystalline black and thermally labile powder from concentrated aqueous solutions of copper and silver nitrate under alkaline and oxidizing conditions. Using the positional parameters of AgAgO 2 as a starting set, Rietveld re5nements have been performed using X-ray and neutron powder data (P2 1 /c, a ‫؍‬ 5.8657(3), b ‫؍‬ 2.8062(2), and c ‫؍‬ 6.0770(3) A > , ‫؍‬ 108.106(4)3, Z ‫؍‬ 2, R p ‫؍‬ 6.61%, R wp ‫؍‬ 5.00% for joint re5nement). The crystal structure consists of chains of ladder-like CuO 4 rectangles running along [010], interconnected by AgO 2 dumbbells. For physical and crystal chemical reasons the oxidation states ؉ I for silver and ؉ III for copper, respectively, have been assigned. Similar to AgAgO 2 and CuO the metal cations form a fcc structure with oxygen at positions slightly displaced from the centers of the octahedral vacancies. The small di4erences from the AgAgO 2 structure can be traced back to a di4erent o4-center position in the octahedral void.