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Sr4Ru3.05O12: A New Member of the Hexagonal Perovskite Family

✍ Scribed by C Renard; S Daviero-Minaud; M Huvé; F Abraham

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
842 KB
Volume
144
Category
Article
ISSN
0022-4596

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✦ Synopsis

Sr 4 Ru 3.05 O 12 crystals have been synthesized under hydrothermal conditions (500°C, 1800 bars). The crystal structure was determined by X-ray single-crystal diffraction. The unit cell is hexagonal and presents a superstructure (a s ‫؍‬ (3a b ‫؍‬ 9.641(2) A s and c s ‫؍‬ c b ‫؍‬ 18.186(5) A s . The average structure has been determined (P6 3 mc space group, a b ‫؍‬ 5.566(4) A s , c b ‫)5(681.81؍‬ A s , and Z ‫؍‬ 2). The structure refinement converged to R ‫؍‬ 0.057 and R w ‫؍‬ 0.032 for 186 independent reflections. The crystal structure is based on the 8H (cchc) 2 close-packed stacking of SrO 3 layers with face-sharing octahedra partially occupied by the ruthenium atoms. Electron diffraction observations and high-resolution electron microscopy image observations recognize the X-ray average structure. The superstructure spots appear clearly in the ED patterns and most of the crystals display diffuse streaks along c*, which are consistent with the disorder clearly imaged in the HREM images. Heating Sr 4 Ru 3.05 O 12 crystals leads to the disappearance of the superstructure.

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