Sr{sub 4}Ru{sub 3.05}O{sub 12}: A new member of the hexagonal perovskite family

Journal Article · Thu Apr 01 04:00:00 EST 1999 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1006/jssc.1999.8132· OSTI ID:349926

Renard, C; Daviero-Minaud, S; Huve, M; Abraham, F ^[1]

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1. Univ. des Sciences et Technologies de Lille, Villeneuve d`Ascq (France). Lab. de Cristallochimie et Physicochimie du Solide

Sr{sub 4}Ru{sub 3.05}O{sub 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{sub s} = {radical}3a{sub b} = 9.641(2) {angstrom} and c{sub s} = c{sub b} = 18.186(5) {angstrom}). The average structure has been determined (P6{sub 3}mc space group, a{sub b} = 5.566(4) {angstrom}, c{sub b} = 18.186(5) {angstrom}, and Z = 2). The structure refinement converged to R = 0.057 and R{sub w} = 0.032 for 186 independent reflections. The crystal structure is based on the 8H (cchc){sub 2} close-packed stacking of SrO{sub 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{sub 4}Ru{sub 3.05}O{sub 12} crystals leads to the disappearance of the superstructure.

• OSTI ID: 349926
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 144; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRYSTAL STRUCTURE
ELECTRON DIFFRACTION
EXPERIMENTAL DATA
LATTICE PARAMETERS
RUTHENIUM OXIDES
STRONTIUM OXIDES
SYNTHESIS
THERMAL ANALYSIS
X-RAY DIFFRACTION