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Perovskite-related LaTiO3.41.
Peter Daniels1, Frank Lichtenberg, Sander van Smaalen
1Laboratory for Crystallography, University of Bayreuth, D-95440 Bayreuth, Germany. peter.daniels@uni-bayreuth.de
Acta Crystallographica. Section C, Crystal Structure Communications
|February 8, 2003
Summary
Researchers synthesized pentalanthanum pentatitanium heptadecaoxide (La5Ti5O17) crystals. The study reveals a unique monoclinic structure with perovskite-like slabs and a superstructure, offering insights into complex oxide materials.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Crystallography
Background:
- Complex oxides with perovskite structures are crucial in various technological applications.
- Understanding the structural nuances of these materials is key to optimizing their properties.
- Lanthanum titanates represent a class of complex oxides with potential for advanced material applications.
Purpose of the Study:
- To synthesize and characterize pentalanthanum pentatitanium heptadecaoxide (La5Ti5O17) crystals.
- To elucidate the crystal structure of La5Ti5O17 using single-crystal X-ray diffraction.
- To investigate the structural features, including perovskite-like slabs and superstructure formation.
Main Methods:
- Floating-zone melting technique for crystal synthesis.
- Single-crystal X-ray diffraction for structural analysis.
- Analysis of diffraction intensities to determine atomic positions and unit cell parameters.
Main Results:
- Successful synthesis of La5Ti5O17 crystals with a 0.3% oxygen excess (LaTiO3.41).
- Determination of the monoclinic crystal structure (space group P2(1)/c).
- Identification of perovskite-like slabs composed of vertex-sharing TiO6 octahedra, separated by oxygen layers.
- Observation of five-octahedra wide slabs and superstructure development along the a-axis due to cation coordination adjustments.
Conclusions:
- The synthesized La5Ti5O17 exhibits a complex layered structure derived from perovskite.
- The crystal structure is dictated by the coordination requirements of La3+ cations, leading to significant distortions and superstructure formation.
- This detailed structural understanding provides a foundation for exploring the properties and potential applications of this lanthanum titanate compound.