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      Brillouin scattering study of ferroelectric transition mechanism in multiferroic metal-organic frameworks of [NH4][Mn(HCOO)3] and [NH4][Zn(HCOO)3]

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      Applied Physics Letters
      AIP Publishing

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          Multiferroic behavior associated with an order-disorder hydrogen bonding transition in metal-organic frameworks (MOFs) with the perovskite ABX3 architecture.

          Multiferroic behavior in perovskite-related metal-organic frameworks of general formula [(CH(3))(2)NH(2)]M(HCOO)(3), where M = Mn, Fe, Co, and Ni, is reported. All four compounds exhibit paraelectric-antiferroelectric phase transition behavior in the temperature range 160-185 K (Mn: 185 K, Fe: 160 K; Co: 165 K; Ni: 180 K); this is associated with an order-disorder transition involving the hydrogen bonded dimethylammonium cations. On further cooling, the compounds become canted weak ferromagnets below 40 K. This research opens up a new class of multiferroics in which the electrical ordering is achieved by means of hydrogen bonding.
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            Coexistence of magnetic and electric orderings in the metal-formate frameworks of [NH4][M(HCOO)3].

            A family of three-dimensional chiral metal-formate frameworks of [NH(4)][M(HCOO)(3)] (M = Mn, Fe, Co, Ni, and Zn) displays paraelectric to ferroelectric phase transitions between 191 and 254 K, triggered by disorder-order transitions of NH(4)(+) cations and their displacement within the framework channels, combined with spin-canted antiferromagnetic ordering within 8-30 K for the magnetic members, providing a new class of metal-organic frameworks showing the coexistence of magnetic and electric orderings.
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              The study of structural phase transitions by means of ultrasonic experiments

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                Author and article information

                Journal
                Applied Physics Letters
                Appl. Phys. Lett.
                AIP Publishing
                0003-6951
                1077-3118
                June 02 2014
                June 02 2014
                : 104
                : 22
                : 222903
                Article
                10.1063/1.4880815
                bf315a69-6588-43ba-ba73-1a53225734ea
                © 2014
                History

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