Regensburg 2013 – scientific programme
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DF: Fachverband Dielektrische Festkörper
DF 20: Focus Session: Organic ferroelectrics
DF 20.1: Invited Talk
Thursday, March 14, 2013, 09:30–10:10, H11
Organic Perovskites : Intriguing Magnetic Ferroelectrics — •Naresh Dalal — Florida State University, Tallahassee, FL 32310, USAA
In an effort to synthesize lead-free perovskite ferroelectrics, we have prepared a new class of metal-organic lattices with a perovskite (ABX3) achitecture[1,2]These are compounds using early transition metals as the A-site, dimethyl amine ( or other homologues) as the B site and the O's of a carboxylic acid as the X sites. The new perovskites exhibit order-disorder as well as displacive phase transitions,with ferroelectric or antiferroelectric behaviors. They can become ferro- or antiferromagnets if magnetic ions such as Fe, Cu (II) utilize magnetic ions such as Cu(II) or Mn (II) ions or their combinations thereof . We will present polarization and NMR, specific heat and NMR relaxation data that show these materials to be glasses. The talk will present experimental as well as theoretical data showing these materials exotic ground states.
[1]Jain, Ramachandran, Clark, Zhou, Dalal, Kroto, Cheetham J. Am. Chem. Soc. 2009, 131, 13625-13627. [2]Besara, Jain, Dalal, Kuhns, Reyes, Kroto, Cheetham. Proc. Nat. Acad. Sci,, USA, 2011, 108, 6828-6832.