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Variation of large-scale regularity in modulated structures of Ca2CoSi2O7 studied by a simulation method.
Katsuhiro Kusaka1, Kenji Hagiya, Masaaki Ohmasa
1Department of Life Science, Himeji Institute of Technology, Koto 3-2-1, Kamigori, Akogun, Hyogo 678-1297, Japan.
Acta Crystallographica. Section B, Structural Science
|July 20, 2004
Summary
The study reveals temperature-dependent two-dimensional modulation in Ca2CoSi2O7, clarifying structural changes with varying modulation vectors (q). Octagonal bundle arrangements characterize the incommensurate phase, indicating large-scale order beyond modulation wavelength.
Area of Science:
- Crystallography
- Materials Science
- Solid State Chemistry
Background:
- Ca2CoSi2O7 exhibits complex modulated structures.
- Understanding these structures is crucial for materials science applications.
Purpose of the Study:
- To elucidate the temperature-dependent two-dimensional modulation in Ca2CoSi2O7.
- To clarify structural changes with variations in the modulation vector (q).
Main Methods:
- Structure construction using various q values.
- Determination of modulation amplitudes at 293 K.
- Analysis of CaO6 polyhedra and bundle distribution.
Main Results:
- The modulation period in Ca2CoSi2O7 varies with temperature (q = 0.285-1/3).
- Structural changes were clarified by constructing models with different q values.
- Octagonal arrangements of bundles were identified as characteristic of the incommensurate phase.
Conclusions:
- The study provides detailed insights into the modulated structure of Ca2CoSi2O7.
- The findings highlight the formation of large-scale regularities exceeding the modulation wavelength.