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گروه محصول -> -> inorganic chemistry(ACS)

آنتی فرومغناطیسم در تک بلور های پروسکیت Pb2MnWO6




کد محصول :79     




آنتی فرومغناطیسم در تک بلور های پروسکیت Pb2MnWO6

 

Polar Order and Frustrated Antiferromagnetism in Perovskite Pb2MnWO6 Single Crystals

Center of Materials Science, Karpov Institute of Physical Chemistry, Vorontsovo pole 10, 105064 Moscow, K-64, Russia
Department of Engineering Sciences, Uppsala University, Box 534, SE-751 21 Uppsala, Sweden
§ Moscow State Institution of Radio Engineering, Electronics and Automation, RU-119434 Moscow, Russia
Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
Inorg. Chem., 2016, 55 (6), pp 2791–2805
DOI: 10.1021/acs.inorgchem.5b02577
Publication Date (Web): March 08, 2016
Copyright © 2016 American Chemical Society

Synopsis

High-quality single crystals of multiferroic Pb2MnWO6 were successfully grown. We observe an uncommon structural transition from cubic Fmm to orthorhombic Pn21a near 460 K, which we analyze and describe in detail. We show that an uncompensated antidipole order exists below 460 K, which yields a ferrielectric response of Pb2MnWO6. Magnetometry and first-principles calculations evidence a low-temperature antiferromagnetic state, with significant magnetic frustration, due to the lattice distortions and competing interaction between the Mn cations.

Abstract

Abstract Image

 

Single crystals of the multiferroic double-perovskite Pb2MnWO6 have been synthesized and their structural, thermal, magnetic and dielectric properties studied in detail. Pure perovskite-phase formation and stoichiometric chemical composition of the as-grown crystals are confirmed by X-ray single-crystal and powder diffraction techniques as well as energy-dispersive X-ray and inductively coupled plasma mass spectrometry. Detailed structural analyses reveal that the crystals experience a structural phase transition from the cubic space group (s.g.) Fmm to an orthorhombic structure in s.g. Pn21a at about 460 K. Dielectric data suggest that a ferrielectric phase transition takes place at that same temperature, in contrast to earlier results on polycrystalline samples, which reported a transition to s.g. Pnma and an antiferroelectric low-temperature phase. Magnetic susceptibility measurements indicate that a frustrated antiferromagnetic phase emerges below 8 K. Density functional theory based calculations confirm that the cationic order between Mn and W is favorable. The lowest total energy was found for an antiferromagnetically ordered state. However, analyses of the calculated exchange parameters revealed strongly competing antiferromagnetic interactions. The large distance between the magnetic atoms, together with magnetic frustration, is shown to be the main reason for the low value of the ordering temperature observed experimentally. We discuss the structure–property relationships in Pb2MnWO6 and compare these observations to reported results on related Pb2BWO6 perovskites with different B cations.

 

 

 

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کلمات کلیدی:پروسکیت چیست , پروسکیت ایران , پروسکیت ابزار , هویه پروسکیت , سایت پروسکیت , کیف پروسکیت ,  تک بلور های پروسکیت , Pb2MnWO6  , تک بلور های پروسکیت Pb2MnWO6  , Perovskite ,  , 

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