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Neutral-ionic phase separation and one-dimensional ferroelectricity in organic relaxors
1Joint Research Center for Atom Technology (JRCAT), Tsukuba 305-0046, Japan.
Physical Review Letters
|December 2, 2000
Summary
Chemical doping of tetrathiafulvalene-p-chloranil with QCl3 induces relaxor ferroelectric behavior. This phenomenon stems from interrupted one-dimensional ferroelectricity due to impurity-generated neutral microclusters.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Solid State Chemistry
Background:
- Investigating microscopic phase segregation and dielectric properties in doped organic charge-transfer complexes.
- Understanding the influence of chemical doping on the electronic and structural behavior of materials.
Purpose of the Study:
- To explore the effects of trichloro-p-benzoquinone (QCl3) doping on tetrathiafulvalene-p-chloranil.
- To characterize the anomalous dielectric response and phase transitions induced by QCl3 doping.
Main Methods:
- Chemical doping of tetrathiafulvalene-p-chloranil with varying QCl3 concentrations.
- Microscopic phase segregation analysis.
- Dielectric susceptibility measurements across a range of frequencies.
- Diffuse x-ray scattering for structural characterization.
Main Results:
- Beyond a critical QCl3 content, the material exhibits relaxor ferroelectric behavior.
- Characterized by significant frequency dispersion and a rounded peak in dielectric susceptibility.
- Diffuse x-ray scattering indicates the emergence of one-dimensional ferroelectricity.
- Impurity-generated neutral microclusters disrupt interchain ferroelectric coupling.
Conclusions:
- QCl3 doping induces a relaxor ferroelectric phase in tetrathiafulvalene-p-chloranil.
- The observed behavior is attributed to interrupted one-dimensional ferroelectricity.
- Neutral microclusters act as defects that hinder long-range ferroelectric ordering.
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