Quasi-spherical molecules are used to construct high-performance molecular ferroelectrics,but accurately producing polar crystals with low symmetry remains a challenge.Herein,we report a novel hightemperature multiaxi...Quasi-spherical molecules are used to construct high-performance molecular ferroelectrics,but accurately producing polar crystals with low symmetry remains a challenge.Herein,we report a novel hightemperature multiaxial molecular ferroelectric(C_(8)H_(14)NO)[FeCl_(4)](1)(C_(8)H_(14)NO=1-methyl-3-quininocyclone).Dielectric and differential scanning calorimetry(DSC)measurements showed that compound 1 had a high Curie temperature of 341.8 K.It crystallizes in the Cmc2_(1) space group at room temperature,showing switchable SHG response,moderate spontaneous polarization(P_(s)=0.24μC cm^(−2)),and clear ferroelectric domains.In addition,DSC and dielectric cycling tests indicate that compound 1 can be used as an excellent electric double-switch material.Notably,the distinct symmetry breaking,that is,4/mmmFmm2,leads to a biaxial ferroelectric with four equivalent directions of polarization.This discovery provides an effective approach for constructing multiaxial high-temperature molecular ferroelectrics.展开更多
基金supported by the National Natural Science Foundation of China(Grant no.21761013,21671086,21461010,and 21471070)the Science and Technology Bureau project of Ganzhou.
文摘Quasi-spherical molecules are used to construct high-performance molecular ferroelectrics,but accurately producing polar crystals with low symmetry remains a challenge.Herein,we report a novel hightemperature multiaxial molecular ferroelectric(C_(8)H_(14)NO)[FeCl_(4)](1)(C_(8)H_(14)NO=1-methyl-3-quininocyclone).Dielectric and differential scanning calorimetry(DSC)measurements showed that compound 1 had a high Curie temperature of 341.8 K.It crystallizes in the Cmc2_(1) space group at room temperature,showing switchable SHG response,moderate spontaneous polarization(P_(s)=0.24μC cm^(−2)),and clear ferroelectric domains.In addition,DSC and dielectric cycling tests indicate that compound 1 can be used as an excellent electric double-switch material.Notably,the distinct symmetry breaking,that is,4/mmmFmm2,leads to a biaxial ferroelectric with four equivalent directions of polarization.This discovery provides an effective approach for constructing multiaxial high-temperature molecular ferroelectrics.
