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A ferroelectric barium titanate, BaTi2O5
Teiichi Kimura1, Takashi Goto, Hisanori Yamane
1Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan. tei@imr.edu
Acta Crystallographica. Section C, Crystal Structure Communications
|December 13, 2003
Summary
Monobarium dititanium pentaoxide (BaTi2O5) was studied for its crystal structure. Researchers discovered a lower symmetry structure, explaining its observed ferroelectric properties along a specific axis.
Area of Science:
- Crystallography
- Materials Science
- Solid State Physics
Background:
- Monobarium dititanium pentaoxide (BaTi2O5) was previously reported to have a monoclinic centrosymmetric space group C2/m.
- Recent findings indicate ferroelectric properties in BaTi2O5, suggesting a deviation from the reported centrosymmetric structure.
Purpose of the Study:
- To investigate the crystal structure of BaTi2O5 using X-ray diffraction.
- To determine the accurate crystal structure that explains the observed ferroelectricity.
Main Methods:
- Synthesis of BaTi2O5 using a floating-zone method.
- X-ray diffraction analysis to study the crystal structure.
- Refinement of the crystal structure in a lower symmetry space group.
Main Results:
- The crystal structure of BaTi2O5 was refined in the monoclinic space group C2.
- A displacement of titanium (Ti) atoms along the b-axis was identified.
- The refined structure is consistent with ferroelectricity observed exclusively along the b-axis.
Conclusions:
- The ferroelectricity in BaTi2O5 is attributed to the lower symmetry crystal structure (space group C2).
- The displacement of Ti atoms along the b-axis is the key structural feature responsible for the observed ferroelectric behavior.