Calorimetric and dielectric study of organic ferroelectrics, phenazine-chloranilic acid, and its bromo analog

Masakazu  Amano; Yasuhisa  Yamamura; Masato  Sumita; Syuma  Yasuzuka; Hitoshi  Kawaji; Tooru  Atake; Kazuya  Saito

doi:10.1063/1.3058589

ABSTRACT

The heat capacities of single crystals of organic ferroelectric complexes phenazine-chloranilic acid

({Phz-H}_{2} ca)

and phenazine-bromanilic acid

({Phz-H}_{2} ba)

were measured. At temperatures below those of the reported ferroelectric phase transitions, heat capacity anomalies due to successive phase transitions were found in both complexes. Excess entropies involved in the low-temperature successive phase transitions are much larger than those due to the ferroelectric phase transitions. The temperature dependence of the complex dielectric constants showed the existence of multiple dielectric relaxation modes in both complexes and their deuterated analogs (

{Phz-D}_{2} ca

and

{Phz-D}_{2} ba

). We discuss the possibility of concerted hopping of neighboring protons within a hydrogen-bonded chain while taking into account the one-dimensional nature of the chain.

ACKNOWLEDGMENTS

This work was supported in part by a Grant-in-Aid for Scientific Research on Priority Area “Non-Equilibrium Soft Matter” (Grant No. 463/19031002) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan.

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Calorimetric and dielectric study of organic ferroelectrics, phenazine-chloranilic acid, and its bromo analog

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