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Dielectric relaxation behavior of a liquid crystal showing an unusual type of antiferroelectric-ferroelectric-antiferroelectric phase sequence.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Kundu, Sudarshan Chaudhuri, B. K. Seed, A. J. Jákli, Antal I. |
| Copyright Year | 2003 |
| Abstract | The temperature and frequency dependent dielectric relaxation behavior of a liquid crystalline (S)-(+)-1-methylheptyl 4-[2-(4-alkoxyphenyl) thiophene-5-carbonylthiooxy] benzoate system is reported. Interesting successive antiferroelectric-ferroelectric-antiferroelectric (AF-FE-AF) phase transitions are observed in this system resembling the successive phase transitions observed in crystalline Rochelle salt. The smectic-C* (SmC*) to AF1 phase transition (around 103.0 degrees C) is first order in nature, predicted from the use of Orihara and Ishibashi theory. It is also found that a contribution of the ferroelectric SmC* phase ordering penetrates even in the antiferroelectric AF1 (SmC(*)(A)) and AF2 (SmC(*)(A)) phases very close to the SmC*-AF1 and SmC*-AF2 phase boundaries (critical regions). It is suggested that this type of mixing of AF and FE phases might cause surface induced ferroelectric- or ferroelectric-type ordering near the AF-FE phase transitions. A soft mode with Debye-type dispersion was observed in the SmA phase. The thermal behaviors of dielectric dispersion, absorption, and dielectric strength in different phases are also reported and discussed. |
| Starting Page | 041704 |
| Ending Page | 041704 |
| Page Count | 1 |
| File Format | PDF HTM / HTML |
| DOI | 10.1103/PhysRevE.67.041704 |
| PubMed reference number | 12786374 |
| Journal | Medline |
| Volume Number | 67 |
| Issue Number | 4 |
| Part | 1 |
| Alternate Webpage(s) | http://digitalcommons.kent.edu/cgi/viewcontent.cgi?article=1166&context=cpippubs |
| Alternate Webpage(s) | https://digitalcommons.kent.edu/cgi/viewcontent.cgi?article=1166&context=cpippubs&httpsredir=1&referer= |
| Journal | Physical review. E, Statistical, nonlinear, and soft matter physics |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
