title: Discovery of new ferroelectrics: [H2dbco]2 x [Cl3] x [CuCl3(H2O)2] x H2O (dbco = 1,4-Diaza-bicyclo[2.2.2]octane).
abstract: Compound [H(2)dbco](2) x [Cl(3)] x [CuCl(3)(H(2)O)(2)] x H(2)O undergoes a sharp dielectric anomaly and a paraelectric-to-ferroelectric phase transition at approximately -23 degrees C with a spontaneous polarization of 1.04 microC cm(-2), being the first molecular metal coordination compound ferroelectrics with a large dielectric response involving a 2 orders of magnitude enhancement and distinct Curie phase transition point. This work has proved an effective way for exploration of new ferroelectrics based on a five-coordinated divalent metal through the combination of crystal engineering and Landau phase transition theory.
authors.affiliation: Ordered Matter Science Research Center, Southeast University, Nanjing 21189, PR China.
authors.forename: Wen
authors.initials: W
authors.lastname: Zhang
authors.forename: Heng-Yun
authors.initials: HY
authors.lastname: Ye
authors.forename: Hong-Ling
authors.initials: HL
authors.lastname: Cai
authors.forename: Jia-Zhen
authors.initials: JZ
authors.lastname: Ge
authors.forename: Ren-Gen
authors.initials: RG
authors.lastname: Xiong
authors.forename: Songping D
authors.initials: SD
authors.lastname: Huang