Synthesis and Crystal Structure of Hexagonal DyMnO₃

Abstract

The magnetic properties were investigated on Co66Fe4B15Si15 amorphous ribbons of annealed at temperature range from 473 K to 773 K in vacuum (A-batch) and open air (B-batch). Static permeability from domain wall motion decreases with annealing temperature both in A- and B-batch sample. The permeability from magnetization rotation increases up to 700 K annealing temperature, but then decreases. The GMI profiles show a symmetric curve in A-batch samples irrespective of annealing temperature. In B-batch samples, symmetric profiles are shown up to 650 K annealing temperature, while they becomes asymmetric for further annealing temperature, due to the exchange bias-field induced by surface crystalline layer.

Synthesis and Oxygen Storage Capacities of Hexagonal Dy1–xYxMnO3+δ

“…For all samples, reactants were thoroughly mixed in an agate mortar and fired in air in the temperature range of 800–1300 °C with intermediate grindings, followed by pressing the samples into high-density pellets at a pressure of ∼10 kbar. All steps of the synthesis were monitored with XRD measurements and compared to previous diffraction reports in the literature of hexagonal P 6 3 cm and perovskite Pnma phases of DyMnO 3 and YMnO 3 . − Dy 1– x Y x MnO 3+δ samples with x = 0.9 and 1 formed single-phase hexagonal structure in air. Dy 1– x Y x MnO 3+δ samples that formed the perovskite or a mixed phase in air ( x = 0, 0.1, 0.3, 0.5, 0.7), were then fired under ultrahigh-purity argon (99.999%) at 1300 and 1400 °C.…”

Hexagonal Manganites—(RMnO3): Class (I) Multiferroics with Strong Coupling of Magnetism and Ferroelectricity

“…3 . The hexagonal structure of DyMnO 3 is metastable and it can be synthesized using special chemical techniques [92,194]. In the hexagonal form, DyMnO 3 is ferroelectric, similar to all other hexagonal manganites.…”

Dynamic magnetic susceptibility of systems with long-range magnetic order

“…The magnetic symmetries of many of the phases of HoMnO 3 have been determined via second harmonic generation experiments [Fiebig et al (2002b)]. For the hexagonal rare earth manganites the rare earth ions occupy two distinct lattice sites within the P6 3 cm space group (2a and 4b) [Kamegashira et al (2004)]. Each site may order differently from the other, depending on the temperature and field.…”

“…This member is usually encountered in the orthorhombic structure, but it can also be synthesized in the hexagonal [Kamegashira et al (2004), Ivanov et al (2006)]. Dy 3+ with an even larger free ion moment than Ho 3+ may be expected to manifest properties similar to holmium if the coupling between the Mn-3d 4 and R − 4f n , where n represents the filling of the f shell, moments is driven mainly by the size of the moment.…”